CET 5 Motor Protection Relay

Quick Start Installation Guide

- 2 -

IMPORTANT

General Precautions ATTENTION

!

ATTENTION

!

Have only qualified personnel service this equipment. If you are not qualified to service this equipment, you can injure yourself or others, or cause equipment damage.

Equipment components are sensitive to electrostatic discharge (ESD). Undetectable permanent damage can result if you do not use proper ESD procedures. Ground yourself, your work surface, and this equipment before removing any cover from this equipment.

ATTENTION

! Disconnect or de-energize all external connections before opening this device. Contact with hazardous voltages and currents inside this device can cause electrical shock resulting in injury or death.

ATTENTION

! To install an option card the relay must be de-energized and then reenergized. When reenergized, the relay will reboot. Therefore, de-energize the protected motor before installing the option card to prevent damage to the motor.

For a properly configured device, the settings in the Main Settings and Overload Settings groups should be adjusted according to the motor and system requirements. Settings in other groups can be programmed as desired.

IMPORTANT For compliance to IEC standards regarding thermal overlaods, set the SERVICE FACTOR to a value: 1.05...1.20

- - 3

Table of Contents

1. Hardware Installation Relay mounting Option cards

............................................................................................... 4

2. CWE4, Core Balance CT & RTD Scanner Module

............................................................................................... 5

3. Wiring Installation Main circuit Star-Delta starter Two-speed starter Control circuit

............................................................................................... 6

- - 4

1 2 3 4

5 6

7

8

9

Option Cards

Figure 2 Inserting Option Cards

Power supply & I/O board (slot A) RTD, PTC board (slot B) Communications card (slot C) Additional I/O card (slot D) Optional voltage card (slot E) CWE, Core Balance board (slot Z) CET5 relay case Mounting screws Back cover

1

2

3

4

5

6

7

8

9

144.0.0 192.0

1. Hardware Installation

Relay Mounting

Figure 1 Mounting and Dimensions

138.0

Legend mm

Mounting Panelmaximum thickness 6.5 mm #8 x 1/2 inch mounting screw Gasket

147.4

20.8

- 5 -

IMPORTANT

2. CWE4, Core Balance CT and CR12D5 RTD Scanner Module

Figure 3 Converter Module, CBCT, and RTD Scanner Connections

Settings associated with options or accessories (converter module, voltage input card, expansion I/O card, RTD scanner) require their installation or connection prior to being made available for configuration.

1. The CET 5 relay is not EMC-Tested for converter module connecting cable lengths greater than the 4-meter cable that is supplied.

2. Up to 12 RTDs can be monitored when an external RTD Scanner is used. There are separate trip and warning settings for each RTD.

3. A simplex 62.5/125 m fiber-optic cable with ST connector is needed for connecting the external RTD module to the CET 5. (Fiber optic cable is not supplied. Contact NHP for details.)

- 6 -

3. Wiring Installation Main Circuit

Converter Module CWE 4-2 CWE 4-20

M

T1 primary current transformer ... A/5 A or ... A/1 A T2 core balance transformer Current ratio of core

3 ~ balance current transformer Output from core balance current transformer

1 ... 2000:1

0 ... 500 mA

!

" #$ ! "

%

&

&

'(

)

)*

)+*

)*

)*,

(-

Figure 6 Voltage Connections (Optional Card required)

L1 L2 L3 F1, F2, and F3 are fuses

F1 L1

F2

F3

L2

L3 CET 5

Direct Connection (Xfmr Connection = Wye)

N

L1 L2 L3 F1 L1

F2 L2

F3 L3CET 5

N

Wye-Wye VT Connection

L1 L2 L3 F1 L1

L2

F3 L3CET 5

Open-Delta VT Connection N

Figure 4 Relay with Phase CTs and Core Balance CT

Figure 5 Relay without Phase CTs

- 7 -

The CET5 can be programmed for automatic star-delta control:

AUX #H = 0001000 (STAR), AUX # FAIL-SAFE = N AUX #H = 0000100 (DELTA), AUX # FAIL-SAFE = N

Figure 7 Star Delta starter power circuit

Figure 8 Star Delta starter control circuit

Star-Delta Starter Circuits

- - 8

The CET5 requires the following setting for two-speed applications :

IN1 = 0000000100

Two Speed Motor Circuits

Figure 9 Two speed starter power circuit

Figure 10 Two speed starter with primary CTs

- - 9

1 See Table 5.38 of CET5 main manual for control function assignment to the input IN1 and IN2. Connect the appropriate external contacts (#1 and #2) to the inputs.

2 Inputs IN3, IN4, and IN5 are available when an optional I/O extension card is present. CIOD5 inputs are rated 120V AC/DC. CIOR5 inputs are rated 24V AC/DC.

3 See Table 5.36 of CET5 main manual for mapping protection elements to the Trip output. See Figure 2.6 and Figure 2.15 of CET5 main manual for typical control circuit connections.

4 See Table 5.37 of CET5 main manual for mapping protection and/or control elements to the Aux outputs. Outputs Aux3 through Aux6 are available when an optional I/O extension card is present.

5 Analog Output is available when an optional I/O extension card is present.

6 You can connect up to six thermistors (PTC) in series. See Table 2.1 of CET5 main manual for PTC cable requirements.

7 Use an up to 500 meter long Simplex 62.5/125 mm fiber-optic cable (ST/ST).

8 Available when an optional DeviceNet Communications Protocol Card is present.

Control Circuit

Figure 11 Relay with control connections (IO)

- - 10

Notes: