section p--power equipment

INSTALLATION TESTING REQUIREMENTS Section P, ATT-TP-76900 AT&T | January, 2010 Revised July, 2021

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SECTION P--POWER EQUIPMENT CONTENTS PAGE

1. GENERAL .............................................................................................................................. P-3

1.1. Introduction ...................................................................................................................... P-3 1.2. General Requirements .................................................................................................... P-3

2. STANDBY ENGINE/ALTERNATOR SETS ........................................................................... P-3

2.1. General ............................................................................................................................ P-3 2.2. Test Requirements .......................................................................................................... P-3

3. FUEL TANKS ......................................................................................................................... P-5

3.1. Primary Tank ................................................................................................................... P-5 3.2. Day Tank ......................................................................................................................... P-5 3.3. Fuel Monitoring System ................................................................................................... P-6

4. AUTOMATIC TRANSFER SWITCH ...................................................................................... P-6

4.1. Test Requirements .......................................................................................................... P-6

5. POWER CONTROL AND DISTRIBUTION BAYS ................................................................. P-6


6. REFTIFIERS .......................................................................................................................... P-7


7. BATTERIES USED IN DS POWER PLANT APPLICATIONS ............................................... P-8

7.1. Test Requirements .......................................................................................................... P-8 7.2. Test Requirements - VRLA ............................................................................................ P-10

8. MICROPROCESSOR CONTROLLER ................................................................................ P-11

8.1. Test Requirements ........................................................................................................ P-11

9. CONVERTER PLANTS ....................................................................................................... P-13


10. INVERTERS ......................................................................................................................... P-13


11. ININTERRUPTIBLE POWER SYSTEMS ............................................................................ P-14

11.1. Test Requirements ........................................................................................................ P-14 11.2. Flooded Cell Batteries Used in UPS Applications ......................................................... P-14 11.3. Initial Startup .................................................................................................................. P-16 11.4. Distribution ..................................................................................................................... P-17 11.5. Grounding ...................................................................................................................... P-17 11.6. Emergency Shutdown ................................................................................................... P-18 11.7. Alarms ............................................................................................................................ P-18

INSTALLATION TESTING REQUIREMENTS Section P, ATT-TP-76900 Revised July, 2021 AT&T | January, 2010

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12. UPS LOAD TESTING .......................................................................................................... P-18

12.1. General ......................................................................................................................... P-18 12.2. Full Load (aka Burn-In) ................................................................................................. P-20 12.3. Battery Discharge Acceptance Test .............................................................................. P-21 12.4. AC Power Fail Test (Power Failure Simulation) ........................................................... P-24 12.5. AC Power Fail Test with Standby Alternator (Power Failure Simulation) ..................... P-24 12.6. Testing Templates for different sizes and types of UPS ............................................... P-25

TABLE P-1 – SUMMARY OF CHANGES IN SECTION P

Revision Date Item Action Requirements Change Notification

02/25/2013 7.1 Modification ATT-TP-76900-013

07/31/2015 Table of Contents Modification ATT-TP-76900-017




05/01/2020 7.3 Addition ATT-TP-76900-026

07/02/2021 Subsection 11 & 12 Modification ATT-TP-76900-028


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1. GENERAL

1.1. Introduction

1.1.1 This section of ATT-TP-76900 covers installation testing requirements for power equipment.

1.1.2 Changes in this issue of Section P of ATT-TP-76900 are summarized in Table P-1.

1.2. General Requirements

1.2.1 Section “A” of ATT-TP-76900 shall be used in conjunction with this Section “P”.

1.2.2 Testing associated with simulated AC failures, transfer of AC from commercial AC to engine/alternator set shall be coordinated with the AT&T Representative and will require a MOP.

2. STANDBY ENGINE/ALTERNATOR SETS

2.1. General

2.1.1 Standby engine/alternator sets shall be installed and tested in a manner that ensures the engine is ready to be run in its normal environment, and that such a run will not damage the engine or the alternator, and that the engine and alternator will perform as designed.

2.2. Test Requirements

2.2.1 The following tests are required and shall be performed in accordance with detail specifications. These tests may be jointly performed with the AT&T:

a) One step or incremental loading, as required by the AT&T Representative

b) Prolonged full load run

c) Exhaust system integrity.

2.2.2 Tests shall be made on the engine to ensure that:

a) All belts are tight and free from defects

b) The engine/alternator oil is filled to the correct level

c) The engine/alternator oil is free of water and any other impurities

d) The engine/alternator coolant is free of oil and other impurities

e) The engine/alternator coolant is at the proper level

f) The engine/alternator does not have any oil, fuel or coolant leaks

g) The engine/alternator heater operates properly.

2.2.3 Tests shall be made on the engine/alternator to ensure that automatic engine shutdown will occur under each of the following conditions:

a) Local Emergency Stop switch is engaged


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b) Remote Emergency Stop switch is engaged

c) Engine/alternator overspeed

d) Engine/alternator coolant high water temperature

e) Engine/alternator low oil pressure

f) Engine/alternator overcrank

g) Alternator voltage exceeds over voltage threshold

h) Alternator voltage does not meet under voltage threshold

i) Low engine/alternator coolant level.

2.2.4 The following safety devices shall be dynamically tested to ensure proper operation:

a) Engine/alternator low oil pressure switch

b) Engine/alternator overcrank control system

c) Engine/alternator coolant high water temperature sensor.

2.2.5 Tests shall be made on the engine/alternator start battery charger to ensure that the start battery is floating at the correct voltage.

2.2.6 Tests shall be made on the engine/alternator environment to ensure that:

a) The engine/alternator has adequate air flow for cooling and for combustion

b) Air intake louvers, if provided, operate correctly

c) Radiator exhaust louvers, if provided, operate correctly

d) Noise levels comply with local ordinances.

2.2.7 Tests shall be made on the engine/alternator alarms to ensure that all alarms are wired and tested to:

a) The local visual alarm indicator

b) The local audible alarm enunciator

c) The remote alarm panel

d) The power monitor (when present)

e) Alarm collection system (when present).

2.2.8 The engine/alternator alarms, as defined in ATT-TELCO-801-601-900, Section “I”, shall be wired and tested to the remote alarm monitoring and surveillance center. These alarms may include some or all of the following:

a) Engine Run

b) Pre Low Oil Pressure

c) Pre High Temperature

d) High Temperature


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e) Overspeed

f) Over Crank

g) Over/Under Voltage

h) Low temperature

i) Low Fuel

j) Switch Off Normal

k) Major - Engine/alternator Fail

l) Minor (Summary Alarm)

m) Rectifier Fail (Start Battery Rectifier Fail)

n) Proper Operation

o) Power Fail (AC Commercial Power Failure).

2.2.9 Fuel supply systems shall be tested in a manner that ensures the system is ready to provide fuel to the engine/alternator and will not damage the engine/alternator or the alternator, and that the engine/alternator and alternator will perform as designed.

2.2.10 When a remote radiator has been deployed, the Installation Supplier shall ensure:

a) All belts are tight and free from defects

b) Proper fan rotation

c) Proper water flow

d) Air flow switch operates properly

e) Proper operation of the engine/alternator room exhaust fan.

3. FUEL TANKS

3.1. Primary Tank

3.1.1 Tests shall be made on the engine/alternator fuel system primary tank to ensure that:

a) All fuel piping is free of leaks

b) The automatic fuel pumping system is of sufficient size and capacity to handle the engine/alternator at engineered capacity.

3.2. Day Tank

3.2.1 Tests shall be made on the diesel engine/alternator fuel system day tank to ensure that:

a) All fuel piping is free of leaks

b) The automatic fuel pumping system is of sufficient size and capacity to handle the engine/alternator at full load

c) Alarm systems operate properly


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d) Transfer pump system operates properly.

3.3. Fuel Monitoring System

3.3.1 Tests shall be made on the fuel monitoring system to ensure that the system is programmed and operating properly.

3.3.2 The Installation Supplier shall ensure that the fuel monitoring system can be controlled from:

a) The front panel/keyboard

b) Remote access.

3.3.3 Test shall be made on the fuel monitoring system to ensure that major and minor alarms are transmitted to:

a) The local audible enunciator

b) The local visual alarm display unit

c) The power monitor (when present)

d) The alarm collection systems, and (when present)

e) The remote alarm monitoring and surveillance center.

4. AUTOMATIC TRANSFER SWITCH


4.1.1 Tests shall be performed to ensure that the automatic transfer switch (ATS) is wired in such a manner as to have the phase rotation in the same direction when switched from commercial AC to engine/alternator AC.

4.1.2 Tests shall be run to ensure that all front panel lamps on the ATS operate properly according to the manufacturer’s equipment manual.

4.1.3 Tests shall be run to ensure that all programs and timers are set in accordance with the detail specification.

4.1.4 Tests shall be run to ensure that the ATS will automatically, upon loss of commercial AC, start the engine/alternator and switch the AC load to the engine/alternator powered alternator.

4.1.5 Tests shall be performed to ensure that the ATS restores to normal setting upon detecting restoration of commercial AC.

4.1.6 The Installation Supplier shall ensure that, upon engine/alternator failure, the ATS will immediately retransfer to commercial AC, if available.

5. POWER CONTROL AND DISTRIBUTION BAYS


5.1.1 Tests shall be run to ensure that:


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a) Each fuse position transmits a fuse alarm

b) Meters are calibrated correctly

c) Voltage sensing relays are adjusted correctly

d) Solid state monitors are adjusted properly

e) The high voltage shutdown feature will shut down all rectifiers that are providing current.

5.1.2 Power control and distribution bay alarms shall be tested to:

a) Operate the local visual and audible alarms

b) The power monitor where a monitor/microprocessor is available

c) Ensure alarms are received at the remote alarm monitoring and surveillance center. The alarms that shall be wired and tested are defined in ATT-TELCO-801-601-900, Section “I’, and may include the following:

1. High Voltage

2. Low Voltage

3. Low-Low Voltage

4. Battery On Discharge

5. Fuse

6. Rectifier Fail

7. Microprocessor Fail (if plant is equipped with a microprocessor)

8. Major

9. Minor

6. REFTIFIERS


6.1.1 General tests shall be performed on each rectifier to ensure that:

a) All meters are properly calibrated

b) Each rectifier current limits at 110% of rated load

c) Each rectifier will load share and pick up the appropriate portion of the load

d) The DC output current is free of AC ripple, in accordance with Table P-2

e) The Rectifier Fail alarm functions correctly (blown fuse powering control circuitry causes failure)

f) Each rectifier output voltage is adjusted correctly

g) An internal blown fuse prevents the rectifier from operating


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h) The rectifier sequence control unit operates properly.

6.1.2 Tests associated with Shutdown and Restart shall be run on each rectifier to ensure that:

a) The internal high-voltage shutdown feature operates properly

b) The automatic restart feature operates properly

c) The external high-voltage shutdown feature operates properly

d) The rectifier automatic restart from the control bay operates properly.

6.1.3 Test associated with simulated commercial power failure and restore shall be run on each rectifier, by turning AC power off and on at the PDSC, to ensure that:

a) Each AC breaker turns off the rectifier as labeled

b) The unit’s current “walk-in” feature operates properly

c) Upon removal of AC, the proper alarms are brought in

d) That upon restoration of AC power, all alarms are retired.

6.1.4 Test to ensure that each rectifier transmits alarms to:

a) The power plant (both visual and audible)

b) The microprocessor, if present

c) The remote alarm monitoring and surveillance center.

6.1.5 When a microprocessor unit is present, tests shall be performed to ensure that:

a) The rectifier output current is monitored

b) The microprocessor can turn the rectifiers on and/or off

c) The microprocessor unit (MPU) monitors the Rectifier Fail Alarm (RFA), as a supplemental and adjunct monitoring operation to the AT&T Alarm Network design. (i.e., the RFA shall be monitored directly by an approved alarm collection system and shall not be dependent upon the interactive operation of an intermediate mediation device, such as the MPU, to report a failure).

7. BATTERIES USED IN DS POWER PLANT APPLICATIONS


7.1.1 A load (discharge) test shall be performed in conjunction with the ATS-Power Test and Certification (T&C) per the following criteria:

a) Battery strings to be added to an existing multi-string plant shall be placed on-line prior to load test.

b) Load test of a new string added to an existing multi-string plant shall be done using the office load, returning to float voltage after the test.


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c) Battery strings to be added as part of a single-string plant or where both/all strings are new (old strings shall be disconnected) shall be load tested prior to being placed on-line.

d) Load testing of string(s) for a single-string plant or where both/all strings are new, shall be done off-line with an artificial load bank using four hour rate for that size battery.

e) Load testing, whether on-line or off-line, shall be run for at least 30 minutes.

7.1.2 Tests shall be performed on the batteries during the load (discharge) test to record (on the Test Record, per ATT-TP-76300).

a) Individual cell voltages during the discharge.

b) Current output, on a per string basis, including existing strings, during a simulated AC outage.

c) Current readings on each individual battery drop cable during a discharge.

7.1.3 Pressure Test Record, Storage Battery Charge Report, and Pilot Cell Charge Report per ATT- TP-76300 Figures M-1, M-2, and M-3, shall be included in the paper records left on-site, in the email to the AT&T Representative, and uploaded to EJF. Output reports from logging meters are an acceptable reference attachment included in the paper records left on-site, in the email to the AT&T Representative, and uploaded to EJF.

7.1.4 The Pilot Cell Charge Report, ATT-TP-76300 shall record the time, charge current, voltage and temperature of the pilot cell, at the following intervals:

a) At the start of charge.

b) Once each hour for the first eight hours of charge.

c) Three times a day after the first eight hours of charge.

d) Just before charging is stopped or temporarily discontinued if necessary. Reference the manufacturer’s documentation to establish the recommended procedure to determine and record full charge.

e) When charging is restarted (if initial charge is interrupted) and the charge current is stable.

7.1.5 The Storage Battery Charge Report and the Pilot Cell Charge Report shall be submitted to the AT&T Representative when the forms have been completed including the 72 hours after end of initial charge reading. The initial charge shall be approved by the AT&T Representative prior to placing the string on-line.

7.1.6 A paper copy of the Storage Battery Charge Report and the Pilot Cell Charge Report shall be turned over to the AT&T Representative to be retained in the central office battery records book. A copy of each shall be uploaded to the Electronic Job Folder (EJF).

7.1.7 Pressure Test Records, per requirements in ATT-TP-76300, shall be included in the paper records left on-site, in the email to the AT&T Representative, and uploaded to EJF


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7.2. Test Requirements - VRLA

7.2.1 Test results for the following items shall be recorded on the Storage Battery Charge Report, per ATT-TP-76300:

a) Tests shall be made on the batteries prior to initial charge to record individual battery conductance values

b) Individual battery voltages after initial charge, but while still on charge

c) Tests shall be made on the batteries to record the individual battery voltages 72 hours after initial charge while on float.

7.2.2 Tests shall be made on the batteries during a discharge (simulated AC outage) to record (on the Test Record, per ATT-TP-76300):

a) Individual battery voltages during the discharge

b) Current output, on a per string basis, including existing strings, during a simulated AC outage.

7.3. Test Requirements – Sodium Nickel Chloride

7.3.1 During warmup, charging, and discharging, verify proper operation of the LED’s as follows:

a) No LED on – BMS not powered up

b) Solid green on – Battery ready to operate, connected to DC bus

c) Blinking green, blinking blue – Battery is warming up, not connected to the DC bus

d) Solid green, solid blue – Battery under charge connected to the DC bus

e) Solid green, solid yellow – battery is discharging (SOC >12.5%)

f) Solid green, blinking yellow – battery is discharging (SOC <12.5%)

g) All other conditions are warnings or alarms. If they occur, corrective action is required.

7.3.2 A load (discharge) test shall be performed in conjunction with the ATS-Power Test and Certification (T&C) per the following criteria:

a) Battery modules to be added to an existing multi-module plant shall be placed on-line prior to load test.

b) Load test of a new module added to an existing multi-module plant shall be done using the office load, returning to float voltage after the test.

c) Battery modules to be added as part of a single-string plant or where both/all strings are new (old strings shall be disconnected) shall be load tested prior to being placed on-line at the appropriate hour rate for the site.

d) Load testing of module(s) for a single-module plant or where both/all modules are new, shall be done on-line with an artificial load bank using the appropriate rate for the site prior to the removal of the old module.

e) Load testing, whether on-line or off-line, shall be run for at least 30 minutes.


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7.3.3 Tests shall be performed on the modules during the load (discharge) test to record (on the Test Record, per ATT-TP-76300).

a) Individual battery (module) voltages during the discharge.

b) Current output, on a per module basis, including existing modules, during a simulated AC outage.

7.3.4 Storage Battery Charge Report and Pilot Cell Charge Report per ATT- TP-76300 Figures M-2 and M-3, shall be included in the paper records left on-site, in the email to the AT&T Representative and uploaded to EJF. Output reports from logging meters are an acceptable reference attachment included in the paper records left on-site, in the email to the AT&T Representative and uploaded to EJF.

7.3.5 The Pilot Cell Charge Report, ATT-TP-76300 shall record the time, charge current, voltage and temperature of the module, at the following intervals:

a) At the start of warmup.

b) At the end of warmup (14 hours later).

c) Once each hour for the first eight hours of charge.

d) Three times a day after the first eight hours of charge.

e) Just before charging is stopped or temporarily discontinued if necessary. Reference the manufacturer’s documentation to establish the recommended procedure to determine and record full charge.

f) When charging is restarted (if initial charge is interrupted) and the charge current is stable

7.3.6 The initial charge shall be approved by the AT&T Representative prior to placing the string online.

8. MICROPROCESSOR CONTROLLER


8.1.1 Many offices have multiple -48Vdc power plants, each equipped with a controller / monitor. When multiple power plants with multiple controller / monitors exist, only one needs to monitor the engine / alternator items described in 8.1.8 and 8.1.9.

8.1.2 The Installation Supplier shall ensure that the microprocessor controller can be controlled from:

a) The front panel/keyboard, and

b) Remote access.

8.1.3 The Installation Supplier shall ensure that, when the microprocessor fails, it transmits a Microprocessor Fail alarm.


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8.1.4 If a sequence control is provided, the Installation Supplier shall ensure that the sequence control will function during an engine/alternator run, with failed or simulated failed, commercial AC.

8.1.5 If an efficiency routine function is provided, the Installation Supplier shall ensure that it works correctly and turns off excess rectifiers.

8.1.6 Tests shall be performed to ensure that the microprocessor controller/remote monitor will retain a history of alarms and drains.

8.1.7 The Installation Supplier shall ensure that the microprocessor controller/remote monitor:

a) Measures plant voltages correctly

b) Measures plant currents correctly

c) Monitors Critical, Major and Minor Plant alarms

d) Measures the voltage of the battery temperature reference (TR) cells correctly (VRLA batteries only)

e) Measures the temperature of the battery TR cells correctly (VRLA batteries only)

f) Monitors individual alarms from each rectifier

g) Measures current from each individual rectifier correctly

h) Monitors individual alarms from each converter (per ATT-TP-76400 section 12 subsection 4.3 Protection Devices paragraph 4.3.14)

i) Measures current from each individual converter correctly

j) Measures current from each individual discharge circuit correctly

k) Measures the voltage of the commercial AC correctly.

8.1.8 Tests shall be performed to ensure that the microprocessor controller/remote monitor monitors the following engine/alternator alarms (When multiple power plants with multiple controller / monitors exist, only one needs to monitor the engine / alternator items described in 8.1.8):

a) Major Alarms

b) Minor Alarms

c) Proper Operation Indication

d) Engine Running Indicator

e) Engine Fail Indicator.

8.1.9 Tests shall be performed to ensure that the microprocessor controller monitors the following engine/alternator set conditions (When multiple power plants with multiple controller / monitors exist, only one needs to monitor the engine / alternator items described in 8.1.9):

a) AC load in kW

b) Output voltage


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c) Output current

d) Temperature.

9. CONVERTER PLANTS


9.1.1 Tests shall be performed on each converter plant to ensure that:

a) The High Voltage shutdown feature operates properly

b) All meters are calibrated

c) The output voltage is adjusted within the limits set by the manufacturer

d) The output current limits are set

e) Each converter will operate at full rated capacity.

9.1.2 Tests shall be made on the converter plant to ensure that major and minor alarms, as defined in ATT-TELCO-801-601-900, Section I, are transmitted to:

a) The local audible enunciator

b) The local visual alarm display unit

c) The power monitor (when present)

d) The alarm collection systems, and (when present)

e) The remote alarm monitoring and surveillance center.

10. INVERTERS


10.1.1 Tests shall be performed on each inverter to ensure that:

a) All meters are calibrated

b) The output voltage is correct

c) Each inverter will operate at full rated capacity

d) Internal static bypass functions properly

e) Maintenance bypass functions properly.

10.1.2 Tests shall be performed on each inverter plant to ensure that all alarms are tested to:


b) The power monitor where a monitor/microprocessor controller is available


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c) Ensure alarms are received at the remote alarm monitoring and surveillance center. The following alarms, as provided, need to be tested:

1. Fuse

2. Inverter Failure

3. Inverter On Bypass

4. Bypass Unavailable

5. Major

6. Minor.

11. ININTERRUPTIBLE POWER SYSTEMS


11.1.1 Tests shall be performed on each UPS to ensure that:

a) All meters are calibrated

b) All cable connections are tight and torqued, if required

c) Battery float voltage is correct

d) The output voltage is correct

e) The output current limits are set

f) The UPS will operate at full rated capacity

g) Internal static bypass functions properly

h) Maintenance bypass functions properly

i) Overcurrent protection devices; correct type and capacity, transmit appropriate alarms and connections tight

j) Spare circuit packs tested and fuses provided.

11.1.2 Tests shall be performed on each UPS to ensure all alarms are tested to the Alarm Center and UPS managing organization. For data centers this is currently EBITS (enterprise building and infrastructure tracking system).


b) [Deleted]

c) Ensure alarms, as defined in section 11.7, are received at the remote alarm monitoring and surveillance centers.

11.2. Flooded Cell Batteries Used in UPS Applications

11.2.1 A load discharge test shall be performed in conjunction with the ATS-Power Test & Certification (T&C) per the following criteria.


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11.2.2 After the initial charge has been completed, a short duration load test shall be performed at the charging location. The purpose of which is to identify cells that fail to perform and need to be replaced. Cells can be tested in 48 volt groups to accommodate common existing load banks. Batteries shall be tested at a rate (amps) comparable to the rate at which they will be used.

11.2.3 Tests shall be performed on the batteries during the load (discharge) test to record (on the Test Record, per ATT-TP-76300).

a) Individual cell voltages during the discharge.

b) Current output, on a per group basis. All groups shall be tested at the same current level.

11.2.4 Battery strings to be added to an existing multi-string UPS shall be placed on-line prior to performing a battery string integrity test.

a) Individual cell conductance shall be evaluated to identify possible cell problems. Cabling and inter-cell resistance and measurements shall be made and evaluated (DLRO, Midtronics, etc.) prior to performing any integrity tests.

b) Assure that there are no alarms on the UPS and verify bypass power is available.

c) The battery string integrity test of a new string added to an existing multi-string UPS shall be done using the UPS load, returning to float voltage after the test (unless the UPS is configured to perform an equalize charge after a discharge).

d) Battery strings to be added as part of a single-string UPS or where both/all strings are new shall have a battery integrity test performed using the UPS load.

e) Battery string integrity testing shall not be performed longer than the run time for which the UPS battery was designed. ATS shall calculate actual runtime due to load and perform integrity test for not more than 100% of the actual engineered design run time of the battery.

11.2.5 Pressure Test Record, Storage Battery Charge Report, and Pilot Cell Charge Report per ATT- TP-76300 Figures M-1, M-2, and M-3, shall be included in the paper records left on-site, in the email to the AT&T Representative, and uploaded to EJF. Output reports from logging meters are an acceptable reference attachment included in the paper records left on-site, in the email to the AT&T Representative, and uploaded to EJF.

11.2.6 The Storage Battery Charge Report and the Pilot Cell Charge Report shall be submitted to the AT&T Representative when the forms have been completed. The initial charge shall be approved by the AT&T Representative prior to placing the string on-line.

11.2.7 [Deleted]

11.2.8 [Deleted]

11.2.9 Pressure Test Records, if performed per requirements in ATT-TP-76300, shall be included in the paper records left on-site, in the email to the AT&T Representative, and uploaded to EJF. Indicate purpose is for pressure test only


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11.3. Initial Startup

11.3.1 It is the responsibility of the UPS manufacturer’s field engineering staff to perform the initial start-up procedure, to ensure it is properly and completely performed. This responsibility, when exercised, initiates warranty coverage for the hardwired UPS. The field engineer conducting the start-up procedure shall also completely fill out Start-Up Data Sheets (manufacturer provided), documenting all readings, adjustments and site-specific programming of the UPS. A copy of the completed Start-Up Data Sheet shall remain with the unit.

11.3.2 Environmental checks shall be conducted to confirm adequate cooling or ventilation for the system, including auxiliary cabinets and power conditioning/distribution units, that the unit and surrounding area is free of debris and foreign material, and adequate space and illumination exists for servicing the equipment.

11.3.3 The UPS and all auxiliary cabinets, including power conditioning/distribution units, shall be inspected prior to power-up to verify the installation, integrity and routing of all power cables. Connections made by the factory as well as installer/contractor-connected terminations, shall be verified tight and properly marked.

11.3.4 Wiring and ribbon cable shall be inspected to ensure:

a) All points of incidental pressure are completely protected from sharp edges of the cabinet system, knockouts and pass-through openings

b) Bending radius is in compliance with ATT-TP-76300

c) All connections are tight, and routing is in accordance with the drawings

d) No strain or stress is placed upon it by any power conductor

e) No other internal condition exists which may result in physical damage to the cable

11.3.5 The following shall be verified to be within manufacturer’s defined tolerance. All measurements shall be recorded on the Start-Up Data Sheet.

a) Line-to-line and line-to neutral input AC voltages input frequency, currents and phase rotation.

b) Battery Input DC voltage and polarity.

c) Optional Bypass Input AC voltages, frequency, current and phase rotation.

11.3.6 All field-adjustable UPS parameters shall be verified to be correct for the installation, and values recorded on the Start-Up Data Sheet.

11.3.7 Battery charger voltage shall be adjusted to 2.25 volts (+/- 1%) per cell for VRLA batteries, or 2.20 volts (+/- 1%) per cell for flooded batteries, or per manufacturers recommendations, based on the type and manufacturer of batteries, the quantity in each string, the battery temperature, mode of operation, and the version of charger. Values shall be recorded on Start-Up Data Sheet.


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11.3.8 Inverter AC voltages line-to-line and line-to neutral, input frequency, and phase rotation shall be measured and verified within tolerance. All measurements shall be recorded on the Start-Up Data Sheet.

11.3.9 All operating modes of the UPS (normal mode, battery supplying load, load on bypass, etc.) shall be tested for proper operation. Transfer from any mode to any other mode shall be monitored to confirm that ac voltage to the load remains uninterrupted. All measurements shall be recorded on the Start-Up Data Sheet.

11.3.10 All measurements provided by the UPS shall be reviewed for accuracy and calibrated as necessary. Final calibration values shall be recorded on the Start-Up Data Sheet.

11.3.11 The UPS shall be inspected to verify that all Class A and AC product changes have been applied and recorded on the Start-Up Data Sheet.

11.4. Distribution

11.4.1 Power conditioning/distribution units, shall be inspected prior to power-up to verify the installation, integrity and routing of all power conductors. Connections made by the factory as well as installer/contractor-connected terminations, shall be verified tight and properly marked.

11.4.2 Wiring shall be inspected to ensure that:

a) Bending radius is in compliance with ATT-TP-76300

b) All points of incidental pressure are completely protected from sharp edges of the cabinet system, knockouts and pass-through openings.

11.4.3 Line-to-line and line-to neutral output AC voltage output frequency, currents and phase rotation shall be measured and verified within tolerance.

11.4.4 The neutral bus shall be inspected in all distribution panels to ensure neutral-ground bond screws or jumpers provided generically have been removed.

11.4.5 If the power conditioning/distribution units contain step-down or isolation transformers, the Installation Supplier shall verify the installation of a proper bonding jumper and grounding electrode conductor.

11.5. Grounding

11.5.1 The UPS cabinet(s) shall be checked for grounding in accordance with Section “H” of ATT-TP-76300.

11.5.2 A visual inspection of the AC neutral will be performed in the UPS system to ensure it is not grounded at the load-end of the circuit. Bonding jumpers shall be installed in accordance with the National Electric Code.

11.5.3 The grounding conductors shall be tested to ensure no current is present on these conductors.


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11.6. Emergency Shutdown

11.6.1 If previously installed, the local Emergency Power off (EPO) shall be tested to ensure the input and output circuit breakers are tripped open and the battery cabinet breaker trips open in the UPS unit. The EPO shall be covered and installed as required in TP 76300, Section M, 7.2. New EPO switches are prohibited in AT&T facilities per AT&T Practice: CRE-50-32-03-ATP-01 posted on the CRE Practices Gateway.

11.6.2 If previously installed, the Remote Emergency Power off (REPO), where provided, shall be tested to ensure the input and output circuit breakers are tripped open and the battery cabinet breaker trips open in the UPS unit.

11.7. Alarms

11.7.1 The alarms that shall be wired and tested are defined in ATT-P-05010-E, Table G, and may include some or all of the following:

a) UPS on Battery

b) UPS on Bypass

c) Bypass not available

d) UPS Inverter Fault

e) UPS Over Temperature

f) UPS Output Overload

g) Low Battery Warning (shutdown imminent)

h) Battery Disconnect Open

i) Battery Temperature (required when VRLA batteries are used-for thermal runaway)

j) Summary Alarm (internal UPS alarms)

These alarms shall be monitored during all testing stages; shall have an audible tone and a visual indication; and shall be received at the remote alarm monitoring surveillance

12. UPS LOAD TESTING

12.1. General

12.1.1 The following tests may be performed jointly with the AT&T Representative. All measurements shall be recorded on the Start-Up Data Sheet provided by the manufacturer and/or the Final Test Report issued by the 3rd party Commissioning Agent.

12.1.2 Testing shall be conducted according to the design type, size and intended application for the UPS system being deployed.

12.1.3 Thermal scans using an infrared camera shall be conducted during full load, overload and battery discharge tests on all components, connections, breakers and battery cells/jars. The UPS manufacturer is responsible for correcting connections made by the UPS manufacturer


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or by his designated installation service provider. The electrician is responsible for correcting connections made by the electrician.

12.1.4 For medium and large UPS installations, including SmartROW and systems utilizing cooling and fire suppression, a third-party commissioning agent using a custom commissioning script will likely be used for the installation. These scripts will vary according to manufacturer and site requirements, but the general requirements of ATT-TP-76900 shall be incorporated into the script or added as needed for the installation to comply with this document. Refer to section 12.6 for a description of different UPS sizes and templates.

12.1.5 There will typically be five phases of testing:

a) Level 1 – Factory Witness Testing (FWT)

1. Performed in the original equipment manufacturers (OEM) factory or in a third-party testing facility

2. Allows for basic verification of operation and capacity for critical infrastructure

3. Helps prevent delivery of components with defects.

4. An AT&T representative does not have to be present to witness the FWT. A certified test report from the UPS manufacturer is acceptable and shall be provided to the AT&T representative by the UPS manufacturer.

5. FWT is required for all large UPS systems. FWT is encouraged, but optional for medium UPS systems. FWT is never required for small UPS systems.

b) Level 2 – Receipt, Installation and Post-installation Checks

1. Performed by Manufacturer Rep / Installation Vendor in conjunction with ATT

2. Inspection and tests on delivery to verify no damage and no alterations

3. All components installed in accordance with drawings, specifications, local code compliance, and manufacturer’s installation requirements, post-installation.

c) Level 3 – Startup and Component Verification

1. Performed by Manufacturer Rep / Installation Vendor in conjunction with ATT

2. Verification that the installed components are operable at a basic level

3. Initial startup by OEM, begin maintaining the Startup Data Sheet

4. Perform pre-test and balancing effort on mechanical systems to ensure accuracy.

d) Level 4 – Functional System Testing

1. Performed by Commissioning Agent, Installation Vendor and ATT

2. Test, Adjust, & Balance (TAB) of the mechanical systems to ensure design airflow and water-flow rates

3. Demonstrations to ensure that related components and equipment operate and perform as designed in normal, maintenance, and emergency modes of operation.


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Verification of settings, alarms, capacities, and performance of associated monitoring and control functions

4. Full load and environmental conditions (8 hours minimum) Burn-In Testing. In some cases, this testing may be performed as part of the Startup by the Installation Vendor during Level 3 Testing.

e) Level 5 – Integrated System Testing

1. Performed by Power ATS and/or Commissioning Agent, Installation Vendor and AT&T

2. Verification that all systems work together under a variety of load conditions as designed

This shall include a load test to demonstrate the equipment space can carry design load under steady state conditions. Tests shall also be performed to verify the installed infrastructure can support low load conditions, sometimes referred to as “day one” loads, under design steady state conditions

3. Verification that systems respond individually, or as a whole, to various actions, events, maintenance activities, or faults as designed per Sequences of Operation.

12.2. Full Load (aka Burn-In)

12.2.1 Test conditions for a full load test:

a) Commercial AC power present at the UPS input terminals and the UPS in the normal condition

b) Test readings shall consist of voltage and current measurements on all input phases and the frequency measurement

c) Rectifier and inverter measurements shall be recorded: inverter output AC voltage and current, frequency, rectifier output voltage and current, and individual cell readings on the batteries

d) All readings to remain within engineered tolerances for the duration of the test

e) Test duration during commissioning will vary according to the design, size and type of UPS as outlined in the templates below, with a minimum acceptable duration of 2 hours for a small UPS and 8 hours for medium and large UPS systems. An overload test at 105% to 125% load is required. Overload percentage and duration is determined by manufacturer’s published specifications.

f) For a modular UPS, “full load” is defined as the cumulative rated kW, typically at unity power factor (PF), of all equipped modules. For example, a 250kVA UPS that uses 50kVA modules rated at 50kW at unity PF, but is only equipped with three modules, shall be considered “full load” 150kW for the burn-in, even if the UPS will be used as a N+1 redundant 100kW UPS. Note that the number of kW used for the “full load” burn-in test may not be the same kW used for the Battery Discharge test.


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12.2.2 To establish full load at the output of the UPS, the load bank may need to be set at a lower level to account for transformer and/or wiring loss. Typical transformer + wiring loss will be ~4%. Typical transformer loss alone will be ~2%, wiring loss alone will be ~2%.

a) For example, if rack mounted load banks are used where AT&T desires to test the entire distribution system, the UPS is a 480Vac input with an output 480::208Vac transformer, where 208Vac is delivered to the rack PDU, the cumulative load banks should be set to 150kW * 0.96 = 144kW, or as close to this number as the load bank setting will allow.

b) In this same example, if the load bank will be connected at the Maintenance Bypass Cabinet (MBC, using a designated Load Bank Breaker (LBB), sub-feed breakers, or similar 480Vac connection point), the load bank should be set to 150kW, or as close to this number as the load bank setting will allow.

c) In this same example, if the load bank will be connected at the transformer PDU output at 208Vac, the load bank should be set to 150kW * 0.98 = 147kW, or as close to this number as the load bank setting will allow.

12.3. Battery Discharge Acceptance Test

12.3.1 Test conditions for Discharge Test:

a) UPS in normal double conversion configuration, energized with commercial power present at the UPS rectifier input terminals, at an ambient temperature of 77°F ± 3°F. If the ambient temperature exceeds this range, then a temperature correction factor (typically called KT) must be applied to the load bank setting. IEEE Std 450™ 2010 or the battery manufacturer can be a reference for KT factors. For example, if ambient temperature is 68°F (20°C), the kW load that the load bank is set to in the discharge test must be lowered by a KT factor (0.942 for VLA batteries with a specific gravity of 1.215).

b) Battery discharge begins when commercial power is disconnected at the UPS input terminals.

c) Inverter measurements shall consist of output AC voltage, AC current, and frequency including waveform.

d) Connect the ac load bank(s) at either the Load Bank Breaker (LBB) at the MBC, at the PDU(s), or at the output sub-feed breakers, whichever is most convenient. Please note, some PDUs may have wiring configurations such that the load banks do not operate as anticipated. In these cases, the load bank will need to be connected closer to the UPS output.

e) Battery Discharge Test readings shall consist of measurements of individual cell or jar as well as battery string output voltage and battery discharge current. The measurements should be taken while the load is applied at the beginning of the discharge test, at specified intervals, and at the completion of the test. Individual cell (or jar) voltage measurements should be taken between respective posts of like polarity of adjacent cells (or jar), so as to include the voltage drop of the intercell connectors. Use of automated measurements from a Battery Management System shall be used when available.


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f) Load bank(s) shall be set to match the Watts per cell (Wpc) from the manufacturer published performance discharge table that was used to engineer the battery reserve, adjusted to account for inverter, transformer, and wiring loss as needed. Typical adjustment factor is to divide string Wpc by 1.0625, rounded to the nearest whole kW.

1. Example: 216 cell EnerSys 12HX-505 VRLA battery string, engineered per 1.67Vpc 15 minute manufacturer published Wpc = 506Wpc. Typical load bank setting should be 216 cells * 506Wpc / 1.0625 = 103kW, or as close as the load bank settings allow.

g) Multiply battery string voltage by battery discharge current at the beginning of the test to verify the kW load seen by the batteries matches the manufacturer published performance discharge table. Any significant variation shall be addressed by adjusting the load bank setting at the beginning of the discharge.

h) Test duration shall be to the battery string end voltage that equates to the average Vpc the batteries were sized to, which shall match a manufacturer published performance discharge table. Typical design will be either a 15 minute or 30 minute reserve duration to an end voltage of 1.75Vpc or 1.67Vpc.

12.3.2 Battery Acceptance Criteria:

a) All readings to remain within engineered tolerances for the rated output elapsed time without low voltage disconnect.

b) Calculate the battery capacity percentage by dividing the actual test time by the manufacturer specified time, multiplied by 100. The equation is shown below:

% capacity at 77°F = Ta/Ts x 100

where:

Ta = actual test time

Ts = specified test time

c) A passing grade is > 90% for VLA batteries and > 100% for VRLA batteries. In the case of VLA batteries, it is natural for the battery to increase in capacity by 10% during the first 6 months of service.

d) Individual cell (or jar) voltages shall be evaluated to verify there are no weak or defective cells (or jars). Individual cell or jar capacity can be determined by substituting the time that the cell or jar voltage fell below the specified end voltage for “Ta" in the capacity formula.

1. If any individual cell or jar falls below 80% (VLA) or 90% (VRLA), it is defective and fails.

2. If any individual cell or jar falls below 90% (VLA) or 95% (VRLA), it shall be investigated for root cause. If the root cause is a manufacturing defect (e.g., weak internal weld or cracked terminal post causes higher internal resistance and excessive heat during discharge), the cell or jar fails. In many cases, a weak cell may be the result of a loose connection or can be resolved via an equalization charge.


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e) Example: 216 cell EnerSys 12HX505 VRLA battery string reaches an end voltage of 216 cells * 1.67Vpc = 360.7V at an actual test duration of 18 minutes at 77°F. The battery string passes because 18 minutes / 15 minutes * 100% is > 100%.

1. However, one 12V jar in the string reached an end voltage of 6 cells * 1.67Vpc = 10V at 13 minutes at 77°F. This jar scored 13 minutes / 15 minutes * 100% = 87%. Intercell / inter-jar connections are verified tight. This jar fails the test and shall be rejected.

12.3.3 Test conditions for Recharge Test:

a) UPS in normal double conversion configuration, de-energized with no commercial power present at the UPS rectifier input terminals, at an ambient temperature of 77°F ± 3°F. If the ambient temperature exceeds this range, then a temperature correction factor (typically called KT) must be applied to the recharge time criteria. IEEE Std 450™ 2010 or the battery manufacturer can be a reference for KT factors.

b) Battery recharge begins when commercial power is restored at the UPS input terminal

c) Load bank shall be set to the same kW load used for the Full Load Burn In Test (section 12.2).

d) Test readings shall consist of measurements of the input and output AC voltage and current, and frequency

e) Rectifier and inverter measurements shall be recorded; inverter output AC voltage and current, frequency, rectifier output voltage and current, and individual cell/battery voltage readings on the batteries

12.3.4 Battery Recharge Test Acceptance Criteria

a) Duration of test, as required to restore the battery strings to full charge as defined below:

RECHARGE TIME – the batteries shall reach 95% SoC (state of charge) in < 10 hours, which requires recharge current < 37% of initial recharge current in < 5 hours, (equates to 80% SoC within 5 hours).

b) VLA and VRLA normalized recharge current closely follows an exponential decay function out to five time constants (TC) beyond the time on current limit (CL, aka bulk phase of recharge). At one time constant, the value of the normalized recharge current should be approximately 0.368 (1/e), at two time constants the normalized recharge current should be approximately 0.135 (1/e2), and at three time constants the normalized recharge current should be approximately 0.050 (1/e3). It is expected that the data will deviate from a true negative exponential with increasing time constants, because the current is not asymptotically approaching zero as would a pure exponential function but is approaching the lower limit of stable float current. For UPS batteries, where the typical discharge results in a 50-70% depth of discharge (DoD) in terms of Ampere-hours removed from the battery, the recharge times and State of Charge (SoC) should be within the values shown in Table 12-1:


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c) All readings to remain within engineered tolerances for the duration of the test.

12.4. AC Power Fail Test (Power Failure Simulation)

12.4.1 Test condition for Standby AC Power Test:

a) Initial condition - UPS in the normal configuration with commercial AC, batteries at full charge

b) Test readings will comprise measurements of the battery output voltage and current

c) Inverter measurements; output AC voltage and current, and frequency including waveform, kW output, engineered minutes and actual minutes of operation

d) UPS to provide AC power for engineered duration with full load connected

e) The UPS is to transfer the load to bypass with no interruption when the batteries have been depleted.

12.5. AC Power Fail Test with Standby Alternator (Power Failure Simulation)

12.5.1 Test condition for Standby AC Power Test:

a) UPS in the normal configuration with commercial AC power

b) Record measurements of the battery output voltage and current

c) Inverter measurements; output AC voltage and current, and frequency including waveform, kW output, engineered minutes and actual minutes of operation. If available, a power quality meter would be an ideal method for these measurements.


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d) Inverter measurements; output AC voltage and current, and frequency including waveformd) Test sequence shall include the following:

1. Static UPS transfer

2. Maintenance bypass UPS transfer

3. Loss of commercial AC power

4. Start emergency alternator, energize emergency AC bus, transfer telephone, mobility or data center power and other critical loads to emergency AC source

5. Operate on emergency power to verify UPS acceptance of power source, including recharge and return to normal configuration

6. Static UPS transfer - emergency power conditions

7. Maintenance bypass UPS transfer - emergency power

8. Restore commercial AC power to main house service board and monitor retransfer of UPS

e) UPS to provide AC power for engineered duration with full load connected.

12.6. Testing Templates for different sizes and types of UPS

With such a wide variety of applications, UPS products, and site requirements throughout the ATT enterprise, a single guideline for UPS installations is unrealistic. The following templates are a guide to minimum requirements. Custom commissioning documents will be generated for nearly all medium and large UPS installations. In most cases this document will be authored by a 3rd party commissioning agent, and will be in much greater detail than the templates. The commissioning document shall be reviewed and approved by the responsible Engineer of record, the Power ATS Manager, and Real Estate Operations Project Manager. If the UPS is being installed in a site which is not a carrier communications space, such as an Internet or integrated cloud environment, a SHO, VHO, DirectTV or Data Center, the appropriate Power SME, Operations or Site Manager shall also review and approve the commissioning document. It is the responsibility of the ATT Representative to ensure the proposed UPS commissioning document includes the testing requirements contained in sections 11 and 12.

12.6.1 Small UPS

A small UPS system will typically be rated from 500 VA to 3 kVA in capacity, and some units may be as large as 20 kVA. They can be a suitcase style, wall or rack mount, or a stand-alone unit used to back up 911 equipment, switchgear controls, provide uninterrupted power to essential general-purpose IP networks, building control systems, or video control systems in stadiums. These small UPS systems will require all Level 2 and portions of Level 3 testing, including the requirements listed below as a minimum:

a) Perform a complete visual inspection.

b) If UPS is to be wall mounted, ensure back board is fire rated, and meets local code requirements


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c) Ensure the electrical circuit provided to power the UPS is adequately sized and has the correct receptacle for the plug

d) If UPS is rack mounted, verify the rack is grounded per ATT-TP-76416 and NEC (NFPA 70)

e) Depending on the application, a Level 3 Start Up may be performed by the Manufacturer or installation vendor. When a Level 3 Start Up is ordered by AT&T, a Start Up Data Sheet shall be provided by the manufacturer or installation vendor.

f) If applicable, verify the cabling for network connectivity, IP programming and setup is correct

g) If applicable, verify the battery kit is installed in the UPS, or if a battery cabinet or stand is used, ensure the batteries are correctly installed. If VRLA batteries are used, ensure conductance or resistance readings are taken by the manufacturer or installation vendor to be used as a baseline.

h) If applicable, test alarms and local status indicators on the UPS

i) Perform an operational test of the UPS. Depending on the size and application of the UPS, the ATT representative may choose to perform a Battery Integrity or Load Test. Such testing shall not be performed longer than the run time for which the UPS battery was designed. ATS shall calculate actual runtime due to load and perform integrity test for not more than 100% of the actual engineered design run time.

12.6.2 Medium UPS

A medium sized UPS system will typically be rated from 20 to 499 kVA in capacity. Many UPS systems will fall into this category, including our traditional online, double conversion systems which ATT has used for decades, and newer modular, and indoor enclosure systems. They may be installed within interior or exterior containers. Medium sized UPS systems will require all Level 2 through Level 4 testing. Depending on the application, it may also include portions of Level 5 Testing. The following shall be incorporated into and completed as part of the Startup or Commissioning as a minimum:

a) Block load testing of the UPS shall be performed during Startup or commissioning per manufacturers specification. If the manufacturer does not provide specific guidance, then the block loads will be in increments of 25%, as follows: 0-25%, 0-50%, 0-75%, 0-100%, 100-0%, 75-0%, 50-0%, 25-0%

b) A full load test shall be performed during commissioning per manufacturers specifications or as described in section 12.2.1 (which specifies 2 hours minimum), whichever is longer

c) An overload test shall be performed during commissioning per manufacturers specifications or as described in section 12.2.1

d) An 8 hour environmental burn in test shall be performed during Start up or Commissioning to verify the UPS room environment, cooling and auxiliary systems function as designed. In the network cloud environment a 3 hour burn in test shall be


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performed at 100% of UPS rated load, 1 hour on rectifier input, 1 hour on static bypass input, and 1 hour on maintenance bypass input

e) A battery discharge test and subsequent recharge test shall be performed in accordance with section 12.3. Battery charge records shall be reviewed by the Power ATS Manager prior to the batteries being placed into service as described in section 11.2. If VRLA batteries are used, ensure conductance or resistance readings are taken by the manufacturer or Installation vendor to be used as a baseline

f) Power Failure Simulation Testing shall be performed in accordance with sections 12.4 and 12.5

g) Steady state input voltage tolerance and input frequency tolerance shall be tested by adjusting the voltage and frequency to the limits specified by the manufacturer. In accordance with IEC 62040-3, the UPS will remain in normal operating mode over the specified tolerance range with the ability to recharge the battery

h) IR scans shall be performed on UPS components, cabling and connections during the full load test, and Battery components, cabling and connections during the discharge test.

i) Metering, displays and indicators shall be tested to ensure items are provided as specified, and are operational, accurate, and calibrated where applicable

j) Alarms shall be tested in accordance with section 11.1.2

k) If applicable, refrigerant levels and pressures, water levels and flow rates and mechanical system parameters shall be verified to be within specification and systems operating nominally

l) If applicable, fire suppression systems shall be tested in strict compliance with manufacturer guidelines

m) If applicable, installed EPO switches shall have covers to prevent accidental operation, and shall be tested in accordance with section 11.6. EPO switches are no longer required by code. New EPO switches are prohibited in AT&T facilities per AT&T Practice: CRE-50-32-03-ATP-01 posted on the CRE Practices Gateway.

12.6.2.1 Reference the Tdocs website for examples of commissioning scripts used for medium sized UPS systems deployed in AT&T.

12.6.3 Large UPS

A large UPS system will typically be rated 500 kVA and larger in capacity. These systems are often used in VHOs, Internet sites and large data centers, and often use flooded cell batteries. They may be installed within interior or exterior containers. Large UPS systems will typically use all Levels (1 through 5) of testing. The same minimum required testing used for medium sized UPS systems shall be completed as part of the Startup or Commissioning for large UPS systems. In addition, the following shall also be performed:

a) In complex, redundant designs, testing shall be designed and performed to demonstrate the system’s ability to respond to anticipated failure and maintenance events. Examples may include:


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1. Simultaneous full load tests (a heat run) to ensure equipment rooms can carry design loads under steady state conditions

2. Low load tests to demonstrate the infrastructure can carry “day one” loads under steady state conditions

3. Testing loss of utility power feeds to demonstrate the system’s ability to automatically react to utility outages

4. Testing to remove pathways or capacity components without service interruption

5. Maintenance item testing where components such as a generator, UPS, chiller or BAS (building automation system) is turned off, or isolated.

6. Testing to demonstrate the system’s ability to automatically react to unplanned equipment or pathway failures (such as flooding or a fire in an electrical room where the entire room is lost)

12.6.3.2 Reference the Tdocs website for examples of the Commissioning Scripts used for large UPS systems deployed in AT&T.

12.6.4 Rotary UPS

Rotary UPS systems are not currently deployed in AT&Ts network and shall be installed per manufacturer’s recommendations and guidance.

12.6.5 DRUPS (Diesel Rotary UPS)

DRUPS are rare in AT&Ts network. They are uniquely different than conventional UPS systems and shall be installed per manufacturer’s instructions and recommendations. Currently DRUPS are installed in Washington State and the Austin Texas area. You may wish to contact the Power ATS Managers in these areas for guidance.

[END OF SECTION]

section p--power equipment

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