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CewePrometer

User Manual

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Contents

Introduct ion ........................................................................................................................5

About this user manual.................................................................................................5Contacting us................................................................................................................5

Product description ...........................................................................................................6

Sealing of CewePrometer-W........................................................................................9

Sealing of CewePrometer-R.......................................................................................10

Connections................................................................................................................10

Mechanical design......................................................................................................13

Function modules .......................................................................................................16

Measuring principles ..................................................................................................17

Configuration, reading and maintenance ......................................................................18

Connecting to CewePrometer.....................................................................................19

Basic configuration.....................................................................................................20

Overview of functions ................................................................................................22

Changing configuration..............................................................................................24

Working with configurations......................................................................................25

Reading.......................................................................................................................25

Information about the meter .......................................................................................26Versions and version conflicts ...................................................................................27

Updating firmware .....................................................................................................27

Language ....................................................................................................................28

Resetting registers and logs ........................................................................................28

Funct ions..........................................................................................................................29

Meter clock.................................................................................................................29

Energy registers ..........................................................................................................30

Instant values..............................................................................................................31Digital inputs and outputs...........................................................................................33

Display sequences ......................................................................................................36

Communications and security ....................................................................................37

Loggers.......................................................................................................................39

Alarms ........................................................................................................................41

Event log.....................................................................................................................43

Maximum demand......................................................................................................44

Historical registers......................................................................................................45

Time of use.................................................................................................................46

Transformer compensation.........................................................................................48

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Contents

Power quality..............................................................................................................50

Miscellaneous.............................................................................................................52

Using the display .............................................................................................................53

Voltage order display layout ......................................................................................53

Navigating in display sequences ................................................................................54

Display layouts with active choices ...........................................................................54

Using the display for communication diagnostics .....................................................56

Appendix A Display Layouts .......................................................................................57

Appendix B - Events ........................................................................................................61

Appendix C Serial Communicat ion Port RS232/422 ..................................................63

Appendix D - Module block d iagram ..............................................................................65

Appendix E Frequently Asked Questions...................................................................66

Appendix F Calculation Princip les ..............................................................................67

Appendix G Material Declarat ion.................................................................................72

Appendix H Connect ion Data ......................................................................................73

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Introduction

IntroductionThank you for choosing the CewePrometer.

The CewesPrometer is a multi-functional, electronic, electricity energy meter. It provides very high

accuracy in measuring electrical energy and also in measuring instantaneous quantities such as

current, voltage, power, frequency etc. CewePrometers extensive configurable functional features

together with the high accuracy enable application areas more numerous than for traditional electric

meters. Besides having well-designed traditional features such as meter registers, data logging and

tariff capability, there are also extensive functions for monitoring alarm conditions, harmonics,

measuring sags and swells and other power quality quantities.

About this user manualThis user manual describes the CewePrometers functions and provides the information needed to

configure and use the meter. The manual covers all versions of the CewePrometer-R (rack-

mounted) and CewePrometer-W (wall-mounted). Some of the described functional properties can

be missing in certain meter versions. The CewePrometer is complemented with CeweConfig, a PC

program for configuring, manual reading and maintenance.

Contacting us

For more information and technical support, please contact Cewe Instrument.

Internet www.ceweinstrument.se

E-mail technical support [email protected]

E-mail order and product information [email protected]

Telephone +46 (0)155 77500

Address Cewe Instrument AB

Box 1006

SE-611 29 Nykping

Sweden

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Product description

Product description

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Figure 1 CewePrometer-W

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Figure 2 CewePrometer-R

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Product description

1 Display

2 Optical communication portThe optical port communicates in accordance with IEC62056-21/IEC1107.

3 Alarm LED

The alarm LED flashes when an alarm state has occurred. For alarms, such as

for high or low voltage, phase balance or similar external errors, the LED stops

flashing when the alarm state has passed. If the meter has had an internal error,

the alarm must be acknowledged and manually reset.

4 Calibration LED for active energy

The LED is the source of the energy signal for accuracy testing of active energy.

The light pulses have a 50% pulse width and a frequency proportional to the

measured active power. A constant that specifies the total number of pulses perkWh can be configured. The same constant applies to active and reactive energy.

5 Auxiliary power LED

When the CewePrometer is receiving auxiliary power, the green LED turns on to

indicate that the meter's power supply is working.

6 Sealing points for terminal coverThe terminal cover can be sealed with lead seals (or comparable seals) and

sealing wire through the sealing points.

7 Terminal cover

8 Sealing points for front panel windowThe front panel exterior window can be sealed with lead seals (or comparable

seals) and sealing wire through the sealing points. The seal prevents access to

the fourth button (sealed button) and the optional backup battery for the real-

time clock.

9 Meter cover

10 Front panel window

The front panel window has hooks for attaching the meter label. In addition, the

window is provided with a pocket for inserting an extra label. The extra label

can be used when transformer ratios are changed.

11 Calibration LED for reactive energy

The LED is the source of the energy signal for accuracy testing of reactive

energy. The light pulses have a 50% pulse width and a frequency proportional to

the measured reactive power. A constant that specifies the total number of pulses

per kvarh can be configured. The same constant applies to active and reactive

energy.

12 Sealed button

The button is hidden under the front panel window and provides access to a fifth

configurable display sequence. Holding down the button for about two seconds

opens a system menu.

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Product description

13 Step backward

The button is used to step backward to a previous display layout in the selected

display sequence, or to step downwards in a menu.

14 Menu/Apply

The Menu/Apply button is used to open the menu where one of four

configurable display sequences can be chosen. The button confirms choices

made or initiates other activities depending on the current display layout.

15 Step forward

The button is used to step forward to the following display layout in the selected

display sequence, or to step upwards in a menu.

16 Sealing points for rack mounting

The rack mounting bracket for the CewePrometer-R can be sealed with lead

seals (or comparable seals) and sealing wire through the sealing points.

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Product description

Sealing of CewePrometer-W

See Figure 1 CewePrometer-Wfor location of the sealing points. The front panel window can besealed with lead seals (or comparable seals) and sealing wire through the sealing points. The seal

prevents access to the fourth sealed button and the optional backup battery for the real-time clock.

Battery cover

Sealed button

Figure 3 Under the front panel window is a fourth button and backup battery for the real-time clock.

The terminal cover can be sealed with lead seals (or comparable seals) and sealing wire through the

sealing points.

The meter cover can be sealed with lead seals (or comparable seals) and sealing wire through the

two sealing points under the terminal cover.

Sealing point

Figure 4 The meter cover can be sealed at the sealing rings on both sides under the terminal cover.

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Product description

Sealing of CewePrometer-R

See Figure 2 CewePrometer-Rfor location of sealing points. The enclosure permits the meter to be

sealed at three points. The top and bottom covers are normally each sealed with a lead seal and with

sealing wire through a sealing screw and a fixed hole on the cover at the rear of the meter. The

exterior window on the meter front can be sealed on a sealing point with a lead seal and sealing

wire. In this way, the meter can be sealed so that it cannot be opened without breaking all the seals.

One of the buttons on the front is protected from access behind the sealed exterior window.

Sealed button

Battery

Under the front panel window is a fourth button and backup battery for the real-time clock.

Connections

Connections to the CewePrometer-W are made on the meter terminal under the terminal cover.

Connections to the CewePrometer-R are made on the rear panel of the meter subrack. The

connections are: measuring voltages, measuring currents, relay outputs, optically isolated digitalinputs, separate auxiliary power and connections to communication modules, if any.

Digital outputs Digital inputs

Output #1 Input #4

Separate aux. power

(Uaux

)

I'L1

UL1

IL1

N

Output #8 Input #1

I'L2

UL2

IL2

I'L3

UL3

IL3

Connections for CewePrometer-W

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Product description

Connections for CewePrometer-R

Digital I/O variants6 outputs, 4 inputs

OUT1 C0, C5 IN1 C4, C9


OUT3 C2, C7 IN3 D4, D9

OUT4 D0, D5 IN4 D3, D8

OUT5 D1, D6

OUT6 D2, D7

10 outputs, 2 inputs



OUT3 C2, C7

OUT4 D0, D5OUT5 D1, D6

OUT6 D2, D7

OUT7 D3, D8

OUT8 D4, D9

OUT9 B7, B8

OUT10 B4, B9

ConnectionsUL1 B1 IL1 A01

UL2 B2 I'L1 A1

UL3 B3 IL2 A02

N B0 I'L2 A2

IL3 A03

Uaux1 B5 I'L3 A3

Uaux2 B6

Current, voltage and auxiliary power connections

for CewePrometer-R.

12 outputs, 0 inputs

OUT1 C0, C5

OUT2 C1, C6

OUT3 C2, C7

OUT4 D0, D5

OUT5 D1, D6

OUT6 D2, D7

OUT7 D3, D8

OUT8 D4, D9

OUT9 B7, B8

OUT10 B4, B9

OUT11 C3, C8

OUT12 C4, C9

Connector for CewePrometer-R

A standardised Entrelec Essailec plug-in connector is used, of the same type as for other meters

according to standard DIN 43862. The cable connection is made in the subrack. The meter is

connected via the contact pins after insertion. The connector has a short-circuit protection featurefor electrical circuits, permitting the meter to be withdrawn and inserted into the subrack during

operation.

Auxi liary power

The CewePrometer is supplied with separate auxiliary power. Auxiliary power can be supplied both

with alternating current and polarity-independent direct current within a specified range. There are

two versions that have either a high or a low auxiliary voltage range.

Digital outputs

The CewePrometer's outputs are solid-state MOS-FET bipolar semiconductor relays, with normally

open contact function. Internal current limit protects the relay from being damaged by excessively

high current.

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Product description

Digital inputs

The optically isolated digital inputs consist of opto couplers, where the LED is powered from an

external voltage signal through series resistance to limit the current. This means that an externalvoltage must be connected between the passive pulse and level transmitter and the opto coupler's

LED, or the transmitter must deliver an active voltage signal to send pulses that are detected by the

optical input. The optically isolated inputs are unaffected by reverse polarity. Both DC and 50/60

Hz AC can be used.

Serial communication ports

The CewePrometer is always equipped with one optical port and is available in versions with or

without additional communication ports. A meter can be equipped with up to two extra ports, either

with the RS232 or RS422 interface.

Communications through the infrared IEC62056-21/IEC1107 optical port are transferredvia an optical read/write adapter, an optical head. The optical head is positioned and

secured over the optical port by a magnet on the head and a steel plate around the opening

of the optical port.

The RS232 standard communication port is used to connect communication equipment

(computers, modems) through a serial cable with a standard D-sub, 9-pin connector.

The RS422 serial communication port is intended to be used to connect the CewePrometer

to a network for multi-drop communications. The CewePrometer is connected to the

communication equipment (RS422 converter) with two twisted-pair wires connected to a

5-pole connector.

For information on pin configuration, see Appendix C Serial Communication Port RS232/422

(pg. 63).

Communication port #2 Communication port #1

Numbering of the communication ports from right to left on the CewePrometer-W.

Communication port #1

Communication port #2

Numbering of the communication ports on the CewePrometer-R

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Product description

Mechanical design

Alternative

mounting

Dimensions for CewePrometer-W.

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Product description

Dimensions for CewePrometer-R.

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Product description

Dimensions for CewePrometer-R subrack.

The subrack is also available in alternative connector versions that will fit other brands of meters

with the same type of connector. Contact Cewe Instrument for more information.

Enclosure and protective earth

CewePrometer-W

The enclosure consists of a meter base, meter cover, terminal cover and a plastic exterior window.

The meter is not connected with protective earth. There is also an optional 19 inch rack/panel

mounting kit available for to CewPrometer-W to be mounted side by side.

CewePrometer-R

Enclosure fits for installation of two meters in a 19" subrack in compliance with DIN438862. The

enclosure consists of a box made of surface-finished steel sheet and a front with a plastic window.The meter is designed for protective earthing through the 19" subrack.

Isolation and personal safety

The electronic circuits are isolated from all connections to the supply mains with transformers.

Digital I/O connections are isolated with opto couplers and solid state relays. The communication

ports are also isolated but for a lower voltage.

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Product description

Function modules

Modulisation

The CewePrometer is made up of function modules. Modulisation is primarily used to make it easy

to produce different versions with the same basic design, and to enable development of new

modules for the basic design to add or replace functions. Modulisation is not primarily intended for

being able to switch plug-in modules in the field the meter must be opened and the seals broken to

switch modules.

Modules

The CewePrometer consists of the following basic modules, which are necessary for a functioning

meter in its simplest version:

Measurement module

Power module

Display and register module

Moreover, the meter is normally equipped with the following modules for additional functionality:

Digital I/O module

Communication module

There is also space for additional function modules for expansion of function properties to meet

future market needs.

For more information, see Appendix D - Module block diagram(pg. 65).

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Product description

Measuring princip les

The measuring circuit in CewePrometer consists of current and voltage transformers that providesignals to six parallel AD converters (analogue to digital converters) that are synchronised by a

common clock signal. The digital signals are thereafter processed by a DSP. Using voltage

transformers makes the electronics in the meter galvanically isolated from the measurement voltage,

which provides good personal safety and protection for connected equipment, such as modems.

Calculation flow

All values are calculated in the CewePrometer based on calibrated current and voltage values.

Current and voltage amplitudes and phase angles are fully compensated in regards to accuracy,

harmonics, frequency and temperature. Adjustments for accuracy are made throughout the dynamic

range for both voltage and current. Based on these individually compensated current and voltage

signals, power, energy, power factor and all other quantities that the CewePrometer can present, aresubsequently calculated. This means that accuracy for instant values is good and that active and

reactive power are correctly calculated, including harmonic power. For more information on

calculation principles and the formulas used, see Appendix F Calculation Principles(pg. 67).

3-element meter

On the 3-element CewePrometer, phase voltages and neutral wires are connected to the meter. The

voltages measured are phase voltages. Power and energy are calculated from three phase voltages

and three currents. Harmonic measurement, alarm monitoring and transformer corrections are made

on phase voltages. The phase to phase voltage is calculated from the phase voltages.

2-element meter

On the 2-element CewePrometer, the neutral conductor is not connected to the meter and the three

voltages are internally D-connected. The voltages measured are subsequently phase to phase

voltages. Power and energy are calculated based on two phase to phase voltages (U12 and U23) and

two currents (I1 and I3) according to the 2-watt meter method. The 2-element meter is primarily

used for D-connected systems (3-wire). Harmonic measurement, alarm monitoring and transformer

corrections are made on phase to phase voltages.

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Configuration, reading and maintenance


CeweConfig is a PC program that makes all CewePrometer functions available. With CeweConfig,you can:

ConfigureConfiguring means that parameters affecting meter function can be set. Examples of

parameters that can be configured are: transformer ratios, logging interval and limits for

alarms.

Reading

Examples of information that can be read are: registers, logged values, alarms and

harmonics. The information can be printed out or saved to a file.

MaintenanceExamples of maintenance tasks are: resetting the event log and updating the firmware in the

meter.

ToolbarMenu

Configuration formStatus barStructure tree

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Connecting to CewePrometer

To be able to configure or read values in the CewePrometer, CeweConfig must be connected andhave authorisation to access the meter. The meter has five different authorisation levels that can be

configured with passwords. See the section Communications and security(pg. 37). With the meter's

factory settings, no password is configured, and subsequently no password is necessary when you

connect.

To communicate with a meter, the PC must be physically connected to the CewePrometer in one of

the following ways:

PC Optical head Meter

PC Crossed serial cable (null modem) Meter

PC Straight serial cable RS422 converter Daisy chained meters

PC Modem Modem Meter

How to connect to the meter

1. Connect to Meter

Choose Connect to Meterfrom the Filemenu or by clicking the toolbar button.

2. Communication channel

Click the Settingstab and choose either Optical Port, Serial Portor Modem. If the serial port or a

modem is used, the baud rate must be selected. For meters with factory settings, the baud rate is

9600. When the optical port is used, CeweConfig adapts itself to the baud rate the meter is

configured for, making selection of the baud rate unnecessary.

Note: The selectable communication ports can be changed by changing the XML file Settings.xml

that is in CeweConfig's installation directory.

3. Modem

If a modem connection is used, a modem must be chosen. The modems available are those installed

in Windows. Click the Commontab and enter the telephone number to be called.

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4. Password

Click the Commontab. A password is entered if one is configured in the meter. With the meter's

factory settings, no password is configured, and subsequently no password is necessary when you

connect.

5. Serial number

Serial number is only required if a special meter is to be addressed when several meters are

connected together with RS422.

6. Trace to file

Under the Settingstab, a box can be checked to activate tracing to a file. A file named

SerialTrace.log is then created in CeweConfig's installation directory. All communications between

CeweConfig and the meter are presented in the file. The function can be used to analyse

communication problems.

7. Click the Connectbutton.

Problems w ith connecting

If the meter cannot be connected, an error message is displayed. Depending on the reason, the

message can suggest corrective actions, such as changing the port or port baud rate.

Tip: When communication problems occur, the trace feature on the meter's display can be used to

see if that which has been sent has been registered by the meter. See the section Using the display

for communication diagnostics(pg. 56).

Basic configuration

Some basic settings may be required before the CewePrometer will be able to measure and operate

correctly in a system.

Note: Settings are only necessary if they have not been made at the factory prior to delivery.

Meters supplied without backup batteries retain the time setting for a maximum of three days. For

time-dependent functions such as logging and event logging to work, the clock may need to be

adjusted.

To change the configuration for a meter, you must be connected to it. Click the Configuration

folder in the structure tree to the left in CeweConfig to display the various functions that can be

configured. For more information see the section Changing configuration(pg. 24).

Tip: You can save a configuration from a meter to a file. A summary of the configuration can also

be printed out. You can also create a configuration without being connected to a meter. For more

information, see Working with configurations(pg. 25).

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Meter clock:To configure the meter clock, choose the node Meter Configuration -

Clockin the structure tree. Find out how the meter clock works and how it can be

configured in the section Meter clock(pg. 29).

Transformer ratios: For the meter to measure accurately, the ratios must be correct. To

configure the transformer ratio in CeweConfig, choose the node Meter Configuration

Measuringin the structure tree. Click the Generaltab in the window that opens. Fill in

the primary and secondary values for current and voltage.

Note: The values you choose as primary and secondary values will be considered as the

nominal values. These nominal values are used by several functions in the meter: alarms,

voltage monitoring and transformer compensation.

Presentation format for energy registers: To configure the presentation format for

energy registers, choose the node Meter Configuration Measuringin the structure

tree. Choose the prefix and number of decimals for energy registers. Based on the nominal

values, a capacity is calculated for how long the meter can measure without registersresetting. Read about energy registers in the section Energy registers(pg. 30).

Pulse constants for pulse outputs (Digital I/O): To configure pulse constants for pulse

outputsin CeweConfig, choose the node Meter Configuration Digital I/Oin the

structure tree. Find out how Digital I/Oworks and how it can be configured in the section

Digital inputs and outputs(pg. 33).

Display sequences: To configure display sequences in CeweConfig, choose the node

Meter Configuration Display sequencesin the structure tree. Find out how display

sequences work and how they can be configured in the section Display sequences(pg. 36).

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Overview of funct ions

The following is a brief overview of the functions available in CewePrometer. All functions in the

meter can be both configured and read in CeweConfig. In many cases, CeweConfig can also export

data to a file or print out data.

Function Configuration location inCeweConfig

Section in handbook describingthe function.

Communication speed

Set the baud rate for the meter'soptical or serial port.

Meter Configuration Communication

Communications and security(pg.37)

Passwords

Regulate access to data in 5levels with passwords orhardware strap.

Meter Configuration Communication

Communications and security(pg.37)

Data loggingLog energy or instant values.

Meter Configuration Loggers Loggers(pg. 39)

Alarms

Activate alarms for events suchas voltage unbalance. Determinehow alarms will be presented.

Meter Configuration Alarm Alarms(pg. 41)

Maximum demand

Determine values that are to bestored as maximum averagevalues.

Meter Configuration Maximum Demand

Maximum demand(pg. 44)

Historical registers

Choose how a historical periodwill be finished.

Meter Configuration Historical Registers

Historical registers(pg. 45)

Time of use

Determine how rates shift overthe course of a day and whichregisters will be divided by rates.

Meter Configuration Time ofuse

Time of use(pg. 46)

Transformer compensation

Compensate errors and losses forinstrument and powertransformers.

Meter Configuration Measuring, TransformerCompensation tab

Transformer compensation(pg.48)

Power quality

Activate monitoring of voltagesags, swells and interrupts.

Meter Configuration Measuring, Power Quality tab

Power quality(pg. 50)

Language on display

Choose between severalavailable languages for thedisplay.

Meter Configuration Misc. Miscellaneous(pg. 52)

Information texts

Enter information texts that canbe read on the display and viacommunications.

Meter Configuration Misc. Miscellaneous(pg. 52)

Calibration LED

Set a pulse constant for thecalibration LED. This is used totest meter accuracy.

Meter Configuration Measuring, General tab

Product description(pg. 6)

Accumulate incoming pulses

Configure registers to accumulatepulses representing a selectablequantity.

Meter Configuration DigitalI/O, Inputs tab

Digital inputs and outputs(pg. 33)

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Indicate alarms via pulseoutput

Choose a pulse output to be

activated in case of alarms.

Meter Configuration DigitalI/O, Outputs tab


Synchronise clock viaincoming pulse

Set an interval that the clock shallbe synchronised to uponincoming pulses.

Meter Configuration Clock

Meter Configuration DigitalI/O, Inputs tab

Meter clock(pg. 29)


Adjusting the clock for daylightsaving time

Set date and time for daylightsaving time.

Meter Configuration Clock Meter clock(pg. 29)

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Changing configuration

To open a configuration form, click the folder Configurationin the structure tree and then click

one of the nodes: Display Sequences, Measuring, Clock, etc. Configuration changes can be made

in all configuration form. In the lower right corner, there is an Applybutton. If a meter is connected

and you click Apply, changes to the configuration will be immediately transferred to the meter. If

the changes affects registers or measurement, a warning dialog will be displayed. You can choose

not to send a portion of the configuration by clearing checkboxes in the dialog.

Warning dialog that sometimes is displayed when configurations are sent to the meter.

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Working with configurations

In CeweConfig, you can work with configurations as a collection of CewePrometer's settings andsave them in a file. On CeweConfig's Filemenu, are the commands Save configuration, Open

configuration and New configuration. A configuration can either be for a 2- or 3-element meter.

You cannot transfer a 2-element configuration to a 3-element meter or vice versa. Transformer

corrections or passwords are not saved in configuration files. On the Filemenu, there is a command

for creating a configuration summary. Below is a list of how you can use CeweConfig's functions to

work with configurations.

Creating a configuration file without being connected to a meter

Choose New configuration when CeweConfig is not connected to create a configuration

file offline. The configuration file can be either of the 2- or 3-element type. Make all settings

that are to be included in the configuration file and save the file. The file's configuration canlater be transferred to a meter.

Saving a meter's configuration to a fileChoose Save configuration when CeweConfig is connected to a meter to save the meter's

configuration to a file. The configuration file can later be used as a backup or be transferred

to another meter.

Transferring a configuration file to a meter

Choose Open configuration when CeweConfig is connected to a meter to transfer a

configuration file to the meter. The changes in configuration cause a warning dialog box to

open. The configuration file can either be created without being connected to a meter, or be

saved from a meter; see the points above.

Printing out a summary of a meter's configuration

Choose View configuration Configuration summary when CeweConfig is connected to

a meter to create a summary of the meter's entire configuration. Now choose Print.

Printing out a summary of a configuration file

Open a configuration file and choose View Configuration summary to create a summary

of the configuration that is in the file. Now choose Print.

Note: ChoosingNew configurationor Open configurationwhen CeweConfig is connected to a

meter opens a warning dialog box with the message that the configuration in the meter will be

written over if you continue.

Reading

If you are connected to a CewePrometer with an authorisation level between 1 and 5, several

alternatives will be available in the structure tree under the node Reading. For the alternatives

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Instant Valuesand Time, displayed values are constantly updated. The others are only updated

when the window is opened or when the Updatebutton is clicked. Read values can be printed out

and often also saved to files, this can be done by with buttons Printand Save.

Information about the meter

Information about the connected meter can be obtained by choosing View Information about the

meter.Some of the information displayed is the same as what appears on the meter plate.

Additionally, there is information on when the meter was manufactured and when the most recent

configuration change was made.

Under the Modules heading, the firmware currently used in the meter is listed. See the section

Updating firmware(pg. 27).

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Versions and version conflicts

The latest version of CeweConfig can be used with all firmware versions of CewePrometer-R/W.The version number for CeweConfig is displayed on the application's title bar or under Abouton

the Helpmenu. The version number for the meter's firmware can be viewed under View

information about the meteron the Viewmenu.

CewePrometer and CeweConfig have three-digit version numbers according to the format main

version.sub-version.build number. As long as the main version and sub-version are the same,

CeweConfig and the meter are compatible. If the meter is of a newer version than CeweConfig and

the main version and/or sub-version are different, CeweConfig will display a message that

connection is not possible. CeweConfig must be updated.

Updating firmwareCewePrometer is designed with a number of modules that each have their own processors and their

own firmware. The module firmware is distributed in a package file (.pkg) which is transferred to

the meter using CeweConfig. Newly developed and improved functions can thus be added in a

meter that lacked these functions when delivered.

Note: Be sure to update CeweConfig to the latest version before updating the meter. There is

otherwise the risk that CeweConfig will no longer be version-compliant after firmware updating.

On the Toolsmenu, there is an Update firmwarecommand when the meter is connected with

authorisation level 4 or higher.Begin by choosing the file that contains the update. The file name

and version number will then be displayed, and sometimes a message. Click the Advancedbutton

to view CeweConfig's version number by module for both the file and the meter. Additionally, you

can force modules to be updated even if the file has the same version number. Click Updateto

begin updating.

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During the time the update is being installed, the meter stops measuring and registering energy.

Depending on the size of the file to be transferred and the baud rate, the time for updating can vary

from a few minutes to a half hour at the highest baud rate. If possible, connect at the highest baud

rate (19200 bps) to speed updating. After updating, the meter is restarted to complete installation of

the meter's new firmware.

Updating can be performed via a modem but this should be avoided since reliability for this method

of communication is too low. An interrupted update can leave a meter with incomplete firmware

that cannot measure at all. If an update via a modem has failed, the next update must be made via

RS232/422 or the optical head.

Language

CeweConfig can be set to different languages. The available languages can be seen under

Languageon the Viewmenu.

Resetting registers and logs

CewePrometer's various registers and log data can be reset with CeweConfig if a meter is connected

and you are connected with a sufficiently high authorisation level. You will find a number of

choices under Reseton the Toolsmenu. Some options may be marked in grey if your authorisation

level is not high enough. To reset energy registers, authorisation level 5 is required, and level 3 for

other options. A warning dialog box opens before resetting.

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Functions

Functions

Meter clock

The CewePrometer has an integrated real-time clock for time-dependent functions. Information

about time adjustment and daylight saving time status is recorded with tags on the logged values;

see Loggers(pg.39). Time adjustments are also noted as an event in the event log; see Appendix B -

Events(pg. 61).

Instantaneous adjustment

The meters date and time can be set to an absolute point in time. Instantaneous adjustment of the

meters time can influence logged values. To avoid this, the meter's log memory is reset when doing

instantaneous adjustment. For this reason, instantaneous adjustment of the meter clock is primarily

intended for use at initial configuration of the meter.

Sliding adjustment

The meters time can be adjusted successively. Instead of the meter adjusting the clock

instantaneously, the total adjustment is spread out over a longer period. A speed of adjustment can

be chosen in the 140% range. With 40%-adjustment, the clock is adjusted 24 seconds for each

minute until the total adjustment has been made.

Daylight savings time

CewePrometer offers the alternative of letting the meter clock follow daylight savings time. At a

specified date, the meter clock is adjusted forward, and at another, adjusted backward.

Example: On 28 March the clock is to be adjusted forward, from 02:00 to 03:00. The adjustment

back to standard time is to occur on 31 October at 3:00 (daylight savings time) when the clock is to

be set back to 02:00. The following is set in the meters: Begin March, 28, 02:00. End October, 31,

03:00 and the standard time is to be adjusted by 60 minutes.

External synchronisation

The meter time can be adjusted by a pulse on one of the meters digital inputs. When a pulse is

registred, the clock is adjusted to the closest multiple of a specified synchronisation interval. If the

synchronisation interval is, for example, one hour and the time is 13:29, a pulse will adjust the clock

to 13:00. If the time had instead been 13:31, the clock would have been adjusted to 14:00.

Available synchronisation intervals are:

10, 15, 20 and 30 minutes

1 hour

Times 12:00 and 00:00

Time 00:00

Besides specifying that the meter clock will synchronise via external pulses, a digital input must

also be configured for clock synchronisation; see the section Digital inputs and outputs(pg. 33).

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Functions

Energy registers

Energy registers in the CewePrometer are electronic counters that accumulate energy. Prefixes andnumber of decimals are configured which apply to all energy registers. Energy registers have a

width of nine digits, regardless of the total number of decimals and the prefix configured. When an

energy register has reached its maximum figure (for example, 999999.999 kWh), it resets to zero.

Fewer decimals and larger prefixes give the energy registers space for more energy without

resetting. Read more about how energy is calculated and defined by quadrants in Appendix F

Calculation Principles(pg. 67).

Overview

The table shows the energy registers available in the meter.

Energy type Energy directi on Total values Per phase values Total numberActive energy Import, export Yes Yes (3-element

meter only)8

Reactive energy Import, export,quadrants I-IV,capacitive, inductive

Yes No 8

Apparent energy Import, export Yes No 2

III

III IV

Active power import(+)

Active power export(-)

Reactive powerexport (-)

Reactive power

import (+)

SQ

P

Capacitive

Inductive

Quadrants Phase angle Current relative to voltage

I 0 to 90 Lagging

II 90 to 180 Lagging

III -180 to -90 Leading

IV -180 to 0 Leading

Storage in non-volatile memory

All registers are saved in non-volatile memory once per second. Loss of auxiliary voltage therefore

results in no more than one second of lost historical energy measurement data. For optimal

safekeeping, all registers are saved in three alternating memory areas.

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Functions

Instant values

Besides energy, the CewePrometer can also measure instant values. Instant values are constantlychanging values such as current, voltage, power and harmonics. The formulas and definitions used

to calculate the values are presented in Appendix F Calculation Principles(pg. 67).

Overview

This table provides an overview of the instant values that can be read on the meter. Readings can be

viewed with CeweConfig, on the display and with other software that has implemented

CewePrometers communication protocol. Most instant values can be logged as average values; for

more information, see section Loggers(pg. 39).

Instant value Available on 3-element

meter

Availab le on 2-element

meterFrequency Yes Yes

Power factor total Yes Yes

Power factor per phase Yes No

Active power total Yes Yes

Active power per phase Yes No

Reactive power total Yes Yes

Reactive power per phase Yes No

Apparent power total Yes Yes

Apparent power per phase Yes No

Phase to phase voltage L12, L23, L31 Yes (calculated)1

Yes

Phase voltage Yes No

THD voltage Yes (phase volt.) Yes (phase to phase volt.)2

Amplitude voltage harmonics (231)4

Yes (phase volt.) Yes (phase to phase volt.)2

Phase symmetry voltage Yes (phase volt.) Yes (phase to phase volt.)

Current Yes (L1, L2, L3) Yes (L1, L3)3

THD current Yes (L1, L2, L3) Yes (L1, L3)

Amplitude current harmonics (231)4

Yes (L1, L2, L3) Yes (L1, L3)

Phase symmetry current Yes Yes4

Phase angle total Yes Yes

Phase angle per phase Yes No

Update frequency

The update frequency for instant values is proportional to the frequency of the measuring voltage.With a 50 Hz measuring voltage, updating occurs 12.5 times per second, and at 60 Hz, 15 times per

second. Instant values can be read up to twice per second via the serial port when it is set to 19200

baud.

1Calculated from the voltages fundamental vectors.2The harmonics for voltage on the 2-element meter are to be seen from the standpoint of the voltages being D-

connected internally.3Current L2 is calculated internally in the 2-element meter for monitoring.

4The value can be read in CeweConfig and via the communication protocol but cannot currently be presented on the

display (meter firmware 1.2.0).

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Functions

Accuracy

The table shows typical accuracy for a CewePrometer with accuracy class 0.2 for a selection ofinstant values.

Instant value Range Accuracy better than:

Voltage amplitude Umin - Umax 0.1% of reading

Current amplitude 5 % of Imax - Imax 0.1 % of reading

Current amplitude 15% of Imax 0.05 % of Imax

Frequency 4763 Hz 0.02 % of reading

Power 1 % of Imax - Imax Corresponds to meters classaccording to energy measurementstandard

Power factor At PF=0.5 and current 5% of Imax- Imax

0.1 % of reading

Harmonics measurement

Harmonics numbers 2 to 31 are measured for all currents and voltages. At a fundamental frequency

of 50 Hz, the second harmonic is 100 Hz, the third harmonic is 150 Hz, etc. Both the harmonics

amplitude and phase angle are measured and included in the calculation of power and energy, and

can be read via the meters communication protocols. In CeweConfig, harmonic amplitudes are

presented with a diagram.

THD

THD stands for Total Harmonics Distortion and is a measurement of the amount of harmonics

present in a signal. Voltages and currents THD can be read via CeweConfig and on the display.

Harmonics on 2-element meter

The harmonics measurements of voltage on the 2-element meters should be seen from the

standpoint of the voltages being D-connected internally in the meter. The harmonics measured are

the vector sums of the phases harmonics.

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Functions

Digital inputs and outputs

The CewePrometer has several inputs and outputs that can be configured to perform various tasks.Both inputs and outputs are protected against overvoltages by varistors. They also have an isolated

interface between the electronics and the surroundings to ensure personal safety. For electrical data

on the meters inputs and outputs, see Appendix H Connection Data(pg. 73).

Inputs

The inputs can be configured as follows:

Not used

The input is not used.

Finish historical period

An incoming pulse will result in the present period ending and registers being copied tohistorical registers. For a pulse to finish historical period, it is also necessary that the

historical registers be configured to allow this. For more information, see the section

Historical registers(pg. 45).

Pulse input

To register pulses from pulse-producing units, such as energy meters or water meters, pulse

inputs are used. Incoming pulses are accumulated in registers called external registers. There

is an external register connected to each input on the meter. For external registers, a factor is

configured by which the number of incoming pulses is multiplied. Prefixes and the number

of decimals can also be configured for the registers. Moreover, the registers can be

configured with descriptive texts.

Time synchronisation

When incoming pulses are received, the meters clock is synchronised at a specific interval

For available synchronisation intervals and more detailed information on time

synchronisation, see the section Meter clock(pg. 29).

Registration of pulses

The meter registers pulses on positive or negative flanks, depending on if the input is set to inverted

or not. A pulse must be at least 16 ms long to be guaranteed of being detected by the meter. The

maximum pulse width that the meter can handle is 60 s. By setting limits for maximum and

minimum pulse lengths, the meter can be limited as to what it detects as a valid pulse. Pulses withlengths beyond the established limits are ignored. The occurrence of to long or to short pulses can

also be configured to be recorded in the event log.

Pulse

length

GND

VCC

Pulse length

(inverted input)

The figure shows pulse lengths when an input is inverted or non-inverted, respectively.

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Functions

Outputs

The outputs can be configured as follows:

Not usedThe output is not used.

Pulse output

The output is used to pulse an energy type that the meter is measuring. A pulse constant is

specified for the output as pulses/unit, primary or secondary, and the pulse length is

specified for all pulse outputs. The shortest possible pulse length is 40 ms. Pulses are not

allowed not come too often, and because of this, there is a relationship between the pulse

length and the specified pulse constant that maximises the pulse frequency to 1000/(pulse

length(ms) * 2).

Pulse Gap

Maximum pulse frequency at outputs limited so that the gap is at least as long as the pulse

length.

Remote control

With this function, the output can be made active or inactive by sending commands to themeter via the IEC62056-21/IEC1107 protocol. This functions could be used control

anything that can be controlled with a digital relay output.

Alarm outputWhen an output is set to functions as an alarm output, one or more of the user-defined

alarms can be chosen to indicate at the output. When an alarm occurs, the output switches to

active, and when the alarm state ceases, the output returns to inactive. In the section Alarms

(pg. 41), user-defined alarms are described and how they can be configured.

In contrast to the other selectable functions for outputs, alarm outputs can be inverted. Note

that outputs are inverted via firmware. If the meter loses its auxiliary power, the relay willopen, regardless of it is inverted or not.

End of MD period (maximum demand period)

At the end of a set MD period, the output will go active for one second before returning to

the inactive state. See the section Maximum demand(pg. 44).

Output states

An active output means a closed relay when the output is not inverted. When the output is inverted,

the active relay is open. Only when the output is used as an alarm output can it be inverted. The

CewePrometer outputs are of the solid-state type and when the meter is turned off, they are open.

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Functions

Meter variants

Meter No of inputs No of outputs

CewePrometer-R 4 6CewePrometer-R 2 10

CewePrometer-R 0 12

CewePrometer-R 0 0

CewePrometer-W 4 8

CewePrometer-W 0 0

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Functions

Display sequences

The following is a description of the function properties of CewePrometers display sequences. Thesection Using the display(pg. 53) describes how to navigate in the display sequences via the

meters buttons, and Appendix A Display Layouts(pg. 57) lists all of the CewePrometers

available display layouts.

Menu for choosing one of the four display sequences. The names of the sequences can be configured.

The CewePrometer is equipped with a graphic display that can show the information available inthe meter. To organise the information, there can be up to five display sequences with a maximum

of 40 selectable display layouts in each. Each display sequence can be given a name that will be

presented on the display.

Display sequence five is only accessible via the sealed button under the front panel window. The

front panel window can be sealed to provide additional security. For this reason, it is appropriate

that display layouts with sensitive information and sensitive functions be placed in display sequence

five.

Automatic disp lay cycl ing

Automatic display cycling means that the display layouts in one or more display sequences areautomatically cycled by the meter. If, for example, display sequences 1 and 3 are configured for

automatic display layout cycling, the meter will first cycle the display layouts in sequence 1 from

the first to last layout, and then continue with sequence 3. After the last layout in sequence 3,

cycling restarts with the first layout in sequence 1. The display layouts cycle with a configurable

delay of 1 to 30 seconds. If a user manually navigates in the display sequences via the meter's

buttons, cycling automatically stops and continues again after one minute.

Passwords and security

The display sequences can be configured to be password protected to limit access for various users.

When a user chooses a password-protected display sequence via the meters buttons, a password

entry field is displayed. Only a correctly entered password gives access to the display sequence andto the display layouts that are included in it. A password can be up to six characters long and

include the characters A-Z, 0-9 and :;=?@. Passwords are not case-sensitive.

Note: If a password-protected display sequence is configured for automatic display layout cycling,

password protection is deactivated.

Automatic return to f irst display layout

One minute after a user has stopped navigating in the display sequences, the CewePrometer returns

to the first display layout in display sequence 1 if automatic display layout cycling is not activated

for any display sequence.

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Functions

Communications and security

All CewePrometers are equipped with an optical port for communication. The meter can beoptionally equipped with one or two additional communication ports with RS232 or RS422

interfaces. The communication protocol used is IEC62056-21, or as the older version of the

standard is called, IEC1107. For more information on how the protocol is implemented, see the

document CewePrometer IEC1107/IEC62056-21 meter reading.

Communication speed

The meters optical port always starts with a baud rate of 300 bps, regardless of what is configured,

before shifting over to the specified communication speed. This means that software (for example,

CeweConfig) that communicates with the meter via the optical port does not need to know the

speed that the meters optical port is set to. The optional ports designated as communication ports

#1 and #2 differ in this respect. They start at the specified baud rate from the beginning, whichmeans that connected software must be aware of the speed to be able to communicate.

Communication port #1 can be set at a speed of between 300 bps and 19200 bps, and

communication port #2 can be set at a speed of between 1200 and 19200 bps. The optical port can

be set at a speed of between 300 and 9600 bps.

Modem initiation

If a modem is connected to one of the optional ports, a modem initiation string can be configured

that the meter sends via the serial port. The initiation string can be used to set the correct

communication settings for the modem and can consist of AT-Commands. The meter sends the

initiation string when the meter is turned on and thereafter every tenth minute. During ongoingcommunications, the meter waits to send the initiation string until communications has stopped.

Security

The meter has five authorisation levels that can limit access to the meter during communication via

any of the meters communication ports. Authorisation levels 1 and 2 are password-protected.

Authorisation levels 3 to 5 may be protected by passwords or by a circuit board jumper.

Authorisation levels

1 Provides access to reading.

2 Provides access to everything in level 1 plus

access to set the clock and finish historicalperiods (also resets maximum demand

values).


access to configure the meter.


access to transfer new firmware to the meter.


access to calibrate the meter and reset

registers.

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Functions

Limitation of total access attempts

The meter limits the total number of access attempts to six when incorrect passwords are entered.

At the seventh attempt, the meter blocks access whether the password is correct or not. The block isin effect until the next hour shift. After that, new password attempts may be made.

Passwords

A password consists of up to 12 case insensitive alfa-numerical characters. The authorisation check

may be deactivated for a level by deleting the password. When connecting to the meter, access is

granted to the highest level that is lacking password regardless of the password given by the user.

Access restriction via circuit board jumper

Inside the CewePrometer, there is space for a circuit board jumper that provides access to

authorisation level 5 when fitted. If the meter is connected with authorisation at level 5, the functionof the jumper can be modified. Security can be heightened by requiring the jumper even for lower

authorisation levels down to level 3. Security can also be relaxed by making authorisation level 5

accessible via a password. Cewe Instrument can provide a technical fact sheet, tfcr0004, that

describes the procedure for opening the meter and fitting the jumper.

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Functions

Loggers

The CewePrometer has two identical, parallel and individually configurable loggers. That which isdescribed in this section applies both to logger 1 and logger 2.

Overview

A logger in a CewePrometer can log average values for instant quantities, energy registers and

external registers. Some quantities can be logged both by phase and as total values for all three

phases, others only as total values. The table provides an overview of quantities that can be logged.

Certain instant values in the table are not available in 2-element meters and thus cannot be logged;

see the section Instant values(pg. 31).

Quantity By phase Total

Active energy import Yes YesActive energy export Yes Yes

Reactive energy import No Yes

Reactive energy export No Yes

Reactive energy inductive No Yes

Reactive energy capacitive No Yes

Reactive energy QI No Yes

Reactive energy QII No Yes

Reactive energy QIII No Yes

Reactive energy QIV No Yes

Apparent energy import No Yes

Apparent energy export No Yes

Phase voltage Yes Yes

Phase to phase voltage Yes Yes

Current Yes Yes

Active power Yes Yes

Reactive power Yes Yes

Apparent power Yes Yes

Frequency Not applicable Yes

Phase angle Yes Yes

Power factor Yes Yes

THD voltage Yes Yes

THD current Yes Yes

External registers 18 Not applicable Yes

Energy is logged as register values, i.e. at each logging occasion the current registers values is

logged. Based on these register values, the reading software can present the energy as register

values, periodic energy or as average power. CeweConfig provides all three alternatives.

Logging interval and total channels

A logger can store data in 1 to 10 channels. Common for all channels in a logger is that that the

logging interval that can be configured from one minute up to one hour. A loggers capacity is

dependent on number of channels and logging interval. When the logger is full, the oldest values

will be written over. The table shows the capacity in number of days before the oldest value is

written over.

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Functions

Capacity in days

Number of l ogging channels

Logging interval

(min) 1 2 3 4 5 6 7 8 9 101 21 14 10 8.6 7.2 6.2 5.4 4.8 4.3 3.9

2 43 28 21 17 14 12 10 9.6 8.6 7.9

5 108 72 54 43 36 31 27 24 21 19

10 217 144 108 86 72 62 54 48 43 39

15 326 217 163 130 108 93 81 72 65 59

30 652 434 326 260 217 186 163 144 130 118

60 1304 869 652 521 434 372 326 289 260 237

Storage of logged values

Logged values are saved with time stamps, tariff information and flags that indicate events that haveoccurred during the logging interval.

The time stamp indicates the end-time. If the logging interval is configured to one hour, a

value with the time stamp 15:00 refers to the period 14:00 to 15:00.

Tariff information indicates active rates for energy and power during the past interval.

To indicate events or states during an interval, a logged value can be stored with one or

more flags.

Event or state Name of flag Explanation

Time adjusted T During the past interval, the meter clock has been adjusted either instantaneous or a slidingadjustment is in progress.

Disturbed D The past interval is incomplete. For example, an interval shortened by the meter beingwithout auxiliary power or if the logging memory has been reset. The first value after thelogging memory having been configured will thus always be indicated with "Faulty value(the logging memory is reset in conjunction with reconfiguration).

Alarm A In conjunction with user-defined alarms being configured, it may be specified that an alarmwill also be indicated with logged values. When a user-defined alarm has triggered duringthe past interval, this is indicated with the flag Alarm.

Parameter changed P The CewePrometers configuration, calibration or initiation has changed. Which of thesethree the flag refers to can be seen in the event log.

Incorrect energydirection

R The CewePrometer can be configured for a normal energy direction, import or export. If themeters energy direction deviates from this, this is indicated with the flag Incorrect energydirection.

Daylight savingstime

S Daylight saving time has been in effect during the past interval.

Voltage

loss/missing

V During the past interval all measuring voltages have been lost or missing.

Invalid value C To be able to guarantee that a logged value is correct, it is logged with a control sum. If thecheck sum is incorrect when the value is read, this is indicated with Invalid value. This is arare event, but could occur if the meter is subjected to powerful, external electromagneticinterference.

For several of the flags, additional information can be viewed in the event log. A more exact

time for events is specified in the log.

Note: When power is calculated from logged energy values, the resulting values will be somewhat

more precise than when power is logged directly. This is because power is logged as an average

value of instant values. The instant values are read twice per second, while energy is accumulated

continuously.

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Functions

Alarms

The CewePrometer is equipped with alarms to be able to indicate when measured quantities areover or under a configurable limit value. The meter enters the alarm state when the limit value is

reached. An alarm is generated only after the alarm state has continued for a configurable time

(delay). Alarms are configurable by the user and are therefore called user-defined alarms. For the

CewePrometer 1.2.0 or earlier, the maximum delay is 64 seconds.

Note: There are alarms and events that cannot be configured, but instead, are always active.

Examples of such alarms are indication that the clock has been changed or that an auxiliary power

loss has occurred. For more information, see the sectionEvent log(pg. 43).

Overview

For most user-defined alarms, the limit value is specified as a percentage of the nominal value,which is the configured, nominal primary value (current, voltage or power). For 3-element meters,

the limit value corresponds to phase voltage, and for 2-element meters, phase to phase voltage. The

following table provides an overview of available alarms.

Alarm Alarm state appl ies when Comm ents

Low voltage The average value of the voltages is beneath thenominal voltage limit value.

High voltage The average value of the voltages is above thenominal voltage limit value.

Low power factor The power factor for the 3-phase system isbeneath the limit value.

Voltage unbalance A voltage deviates percentage-wise from theaverage value of all voltages more than the limitvalue.

Current unbalance A current deviates percentage-wise from theaverage value of all currents more than the limitvalue.

Low active power The 3-phase systems total power is beneath thenominal power limit value.

High active power The 3-phase systems total power is above thenominal power limit value.

High THD voltage The average value of THD for all voltage phasesexceeds the limit value.

High THD current The average value of THD for all current phasesexceeds the limit value.

High harmonic voltage An overtone (2nd to 31st) relative to the basic

tone on same voltage phase exceeds the limitvalue.

The event log identifies the

phase and harmonic no.

High harmonic current An overtone (2nd to 31st) relative to the basictone on same current phase exceeds the limitvalue.

The event log identifies thephase and harmonic no.

Reverse energy direction The phase angle for a phase deviates by morethan 90 degrees from another phase.

The event log identifies thephase with the deviating energydirection. This alarm is notavailable on 2-element meters.

Voltage phase missing One or more voltage phases is missing The event log identifies themissing phase or phases.

Internal error See the section Event log(pg. 43).

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Functions

Indication

Alarms are always stored in the event log. Alarms can also be configured to indicate in one or moreof the following ways:

Alarm LED on meter front

Changed digital output level

Indication of a logged value with a flag

The alarm LED stops flashing and the digital output returns to inactive low after the alarm state

passes.

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Functions

Event log

The CewePrometer has a number of defined events and alarms that are stored in the meters eventlog when they occur. The event log can contain a maximum of 40 events. Thereafter, the oldest will

be removed to make room for the new. The meter has a counter for the total number of events that

have occurred since the latest reset.

An event is represented by a time stamp and a code that indicates what has occurred. See Appendix

B - Events(pg. 61) for a complete list of all events. For certain events, data is also stored for the

events, for example, which phase the event concerns.

Events are divided into three categories:

User-defined alarmsThe meter has a number of alarms that when they occur, generate an event in the event log.

The alarms each have an individual configuration that determines the conditions for when an

alarm is to be activated. See the section Alarms(pg. 41).

Meter events

The meter is also equipped with a number of alarms that are not configurable by the user,

so-called meter events. These have set conditions and are stored only in the event log.

Examples of meter events are auxiliary power loss and clock resetting. A complete list of

meter events is in Appendix B - Events(pg. 61).

Internal errors

The contents of the internal data structures, such as configuration and energy registers, arechecked by the meter. If an error is detected in one of the data structures, it is designated as

an internal error. If an internal error is indicated, the event log should be checked for related

information, and suitable actions should be taken. Internal errors are listed in Appendix B -

Events(pg. 61).

Display of events

The event log can be viewed on the meters display if the display layout Eventsis configured to be

included in one of the meters display sequences. Only the time stamp and event code are shown on

the display. A more detailed description of the meter's events can be viewed in CeweConfig, which

converts the code into plain text and displays any related data. Via CeweConfig, the event log can

also be printed out or saved to a file.

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Functions

Historical registers

Historical registers are used by the CewePrometer to store current register values at defined pointsso as to be able to read them later. Stored in historical registers are all maximum demand values,

external registers, TOU registers and energy registers, with the exception of energy registers by

phase. The historical registers are time stamped to indicate when storage occurred. The

CewePrometer can store up to 14 historical registers.

Date and time

Energy registers Maximum demandvalues

Time of use registers External registers

Historical register includes a number of stored registers, and dates/times when they were stored.

Finish historical periods

By finishing a historical period, the current registers values are stored in historical registers and the

maximum demand values are reset. When a period is finished, an event is stored in the meters

event log. Periods can be finished in various ways:

Via meter button The period is finished when the meters Menu/Apply button

is held down for more than two seconds when the display

layout Finish periodis active.

This requires both that the historical registers are configured

to permit finish via the meter button and that a display

layout for this is entered in a display sequence.

Via CeweConfig The period is finished when a command is given from

CeweConfig or third-party software.

At the end of the

month

The period is finished when the meter clock reaches the end

of the month.

Via digital input. The period ends when a pulse is received at a digital inputon the meter.

This requires both that the historical registers are configured

to permit ending via a digital input and that an input is

configured for this purpose.

Note: The display layoutFinish periodwill only work if the meter is configured to permit ending a

period via a button.

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Functions

Time of use

Time of use is a function that enables energy to be divided up into various registers depending onthe rate that applied when the energy was measured. In the CewePrometer, tariff structures can be

stored that switch rates at predetermined times according to a configurable pattern. A tariff structure

consists of seasons, day types and special days. The maximum number of rates is eight.

Day types specify how rates change during a 24-hour day.

Seasons specify the day types that apply during the days of the week, Monday to Sunday.

Special days specify the day type that applies on a certain date.

Tariff structures

In the CewePrometer, there are two separate tariff structures. Both tariff structures have a set of daytypes, seasons and special days. By setting a starting date for a tariff structure, it can be configured

before it goes into force.

Day type

In the CewePrometer, there are 16 day types (AP). A day type specifies witch rate, from a

maximum of eight, should apply when during the day. 16 changing points per day may be specified.

A day type can be connected to a day of the week in a season or to a special day.

Season

A season refers to a period. During this period, the season defines the day types that will apply

during the days of the week. In the CewePrometer, there are 16 seasons per tariff structure. The

seasons are arranged in a sequence where one season replaces the previous at a predetermined date.

Special days

Days that change rates according to a pattern that is not covered by linking day types to seasons

(such as holidays) are called special days. A special day specifies the day type that applies on a

certain date. Special days can be configured to apply every year on the same date or for a single

year. In the CewePrometer, up to 30 special days per tariff structure can be configured.

TOU registers

An energy register or external register that is chosen to be divided into the rates is a TOU register.There are eight TOU registers and each TOU register has separate registers for eight rates.

Maximum demand values and tariffs

Maximum demand values are stored together with information on which rate applied when

registered. For one and the same day, there can be separate day types for energy and maximum

demand values.

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Functions

Example:The conditions are Monday to Saturday, rate 2 applies from 7:00 in the morning until

17:00 in the afternoon. For the rest of the day, rate 1 applies. On Sundays, rate 1 applies around

the clock. During the summer months, 1June to 31 August, rate 1 applies around the clock. On

Christmas Eve, 24 December, rate 1 applies around the clock. For maximum demand values, rate 3

always applies. It is active energy import that is divided in to different rates.

Day types

Three day types must be configured. Day type A to apply to energy during the autumn, winter and

spring. Day type B to apply during the summer months, and day type C for maximum demand

values throughout the year.

Day type A Day type B Day type C00:00 Rate 1 00:00 Rate 1 00:00 Rate 3

07:00 Rate 2

17:00 Rate 1

Seasons

Two seasons must be configured. The first season will apply during the summer period and the

second the rest of the year. The season that applies from 1 September will also apply from 1

January to 31 May.

06-01 Energy A A A A A A B

MD C C C C C C C

09-01 Energy B B B B B B B

MD C C C C C C C

Special day

For rate 1 to apply all of Christmas Eve, a special day must be configured. Because no year is

specified, the special day will apply every year.

12-24 Energy C

MD C

TOU register

A TOU register is configured to accumulate active energy in several registers for the different

rates.

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Functions

Transformer compensation

Transformer compensation is a function for compensating for measurement errors in instrumenttransformers and for losses in power transformers. The function enables the CewePrometer to

present measurement values for which errors and losses have been compensated. The formulas used

in the meter are presented in Appendix F Calculation Principles(pg. 67).

Overview

The tables present an overview of the transformer compensations in CewePrometer.

Instrument transformer compensations

Name Value to entered

Amplitude error as percentVoltage error L1, L2, L3

Phase angle in minutesAmplitude error as percentCurrent error L1, L2, L3

Phase angle in minutes

Power transformer compensations

Name Value to entered

Active loss as percent of nominal powerCopper losses, Total values

Reactive loss as percent of nominal power

Active loss as percent of nominal powerIron losses, Total values

Reactive loss as percent of nominal power

Instrument transformer compensations

To compensate for errors in instrument transformers, their amplitude error in percent and phase

angle error in minutes are configured in the meter. One minute is equal to the angle 1 /60. The

errors can be specified separately for all voltages and currents. When instrument transformer

compensations are used, current and voltage are affected, as well as all quantities that arise from

these: power, energy, etc.

2-element meter

When voltage errors are compensated on a 2-element meter, this is done on phase to phase voltages

L12, L23 and L31 instead of on phase voltages. Only L12 and L23 are included in the calculation of

power and energy. Compensation of L31 has no significance in this respect. In compensation of

current errors for 2-element meters, only L1 and L3 can be compensated for because they are theonly currents measured.

Power transformer losses

Power transformer losses consist of copper and iron losses. They are expressed as percentages of

nominal power. One value is specified for active loss and one for reactive. When compensation of

losses is configured, power, energy, power factor, etc. are affected but not current and voltage.

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Functions

Calculating loss values

Based on the nominal total power and the measured loss value in watts, a loss value can be

calculated as a percentage of nominal power. It is the loss value that is configured in the meter.

Nominal power is calculated with configured nominal current and voltage.

Nominal power: 3= nomnomnom voltageLineCurrentPower

Loss value: 100/ = nomPowerLossvalueLoss

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Functions

Power quality

Power quality encompasses voltage monitoring and harmonics measurement. Harmonicsmeasurement is described in the section Instant values(pg. 31).

Voltage monitoring

Voltage monitoring monitors three states: swells (overvoltage), sags (undervoltage) and interrupts.

Monitoring is activated by configuring the limit values for sags and swells, and is deactivated by

setting the limits to zero. The limits are expressed as percentages of configured nominal voltage.

Example: For an upper limit of 110% and a lower limit of 90%, and the configured nominal

primary voltage of 10 kV, the limits attained are 9 kV and 11 kV primary.

For 3-element meters, the average value for phase voltage is monitored, and for 2-element meters,the average value for phase to phase voltage is monitored.

Sags and swells

Sags and swells shorter than one second are registered by accumulating registers. If the state lasts

longer than one second, it is instead registered in the event log with a time stamp and duration. The

accumulating counters and the event log can be read in CeweConfig.

Interrupts

When the average value for voltage falls to under 10% of the configured nominal voltage, this is

registered as an interrupt in the event log with a time stamp and duration. Duration for an interruptof less than three seconds, and down to 10 ms, is presented as "< 3 s".

State Duration Registered in Duration presented as

Sags and swells 160 ms51 s Accumulating counter Duration not specified

Sags and swells > 1s Event log Duration of state

Interrupt 10 ms6 3 s Event log < 3 s

Interrupt > 3 s Event log Duration of state

5Applies to basic frequency 50 Hz. Corresponding time at 60 Hz is 130 ms.

6Applies to basic frequency 50 Hz. Corresponding time at 60 Hz is 8.3 ms.

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Functions

Hysteresis

Hysteresis means that the limit for a state and the limit for when it is restored are different. This to

avoid several states being registered when the voltage level varies around a limit. The hysteresislimit is always midway between the low or high limit and nominal voltage.

110%

105%

100%

95%

90%

Limit for swells

Nominal voltage

Hysteresis limit

Limit for sags

Hysteresis limit

11 kV

10 kV

9 kV

9,5 kV

10,5 kV

Limit for interrupt

Duration sag

Duration

interrupt

10%1 kV

PercentPrimary vol tage (example)

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Using the display

Using the display

This section describes how the CewePrometers display can be used to read measurement valuesand also to control certain functions in the meter. The display layouts are arranged in display

sequences. For details on display sequences, see Display sequences(pg. 36). A complete listing of

display layouts is presented in Appendix A Display Layouts(pg. 57).

Quadrant indicator

In most display layouts, a quadrant indicator is shown in the lower-right corner. The quadrant

indicator shows the quadrant in which energy is currently being measured. See Appendix F

Calculation Principles(pg. 67) for a definition of quadrants.

Quantity

Measurement value

Unit

Phase

Quadrant indicator Display layout

Quadrant I

Quadrant II

Quadrant III

Quadrant IV

Voltage order display layout

When the CewePrometer starts, the display layout Voltage Orderis always shown for about 15

seconds. The display layout shows the order of the connected measurement voltages. If the voltage

order is correct, the current direction is indicated with a + or a -. If not all voltages are connected,

Phase missing is shown on the display. The current direction is indicated with a + if the currents

phase angle is following its voltage with a maximum deviation of 90; if it is not, a - is displayed.

Correct voltage order and current direction.

Reversed current direction on phase 1.

Reversed voltage order (no current direction shown).

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Using the display

Navigating in display sequences

Use the buttons on the front of the CewePrometer to step through the display sequences. For moreinformation, see the Product description(pg. 6) section for button placement.

Step forwardStep to next layout in the display sequence or moves upward in a menu.

Menu/Apply

The Menu/Apply button is used to open the menu where one of four configurable display sequences

can be chosen. The button is used to confirm choices or initiate other activities depending on the

327.3 usermanual ceweprometera0172e-1a

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