UNINTERRUPTIBLE POWER SUPPLY FIELD INSPECTION AND ELECTRICAL TEST OF UPS

UNINTERRUPTIBLE POWER SUPPLY FIELD INSTALLATION CHECK LIST

VISUAL AND MECHANICAL INSPECTION

Yes
No
1.      All components have been checked against one-line diagram and have been signed off by all agencies.
2.      Safety equipment in place and serviceable per standards.
3.      All power and control wiring tested, marked, color coded and properly phased (AC/DC circuits).
4.      HVAC checked out, operational and on.
5.      All cabinets, enclosures and rooms clean.
6.      Replacement power and control fuses, control boards available for both inverter and rectifier.
7.      Normal power is available for start-up and commissioning.
8.      All vendor (manufacturer) manuals and factory test documents are available.
9.      Batteries tested per Manufacturers instructions.
ELECTRICAL  INSPECTION
Yes
No
1.      UPS start-up procedure approved and available.
2.      Verify inverter check-out by vendor Representative.
3.     Witness and verify output wave forms are correct.
4.      Witness and verify output voltage is set and correct.
5.      Witness and verify all alarm functions.
6.      Witness and verify static switch function.
7.      Verify operation of manual bypass switch.
8.      Verify all voltmeters/ammeters are calibrated and correct.
9.      Insure Operations has sufficient operator training on UPS system.

Electrical Function Testing

Equipment Required
Digital Voltmeter (DVM)
Spectrum Analyzer to 10 Khz
Multi-amp tester
Dual trace Oscilloscope, (ungrounded plug)
1. UPS on line and unloaded.
Yes
No
a.      Connect Oscilloscope and DVM to UPS output, compare reading to the installed output meter.
b.      Take Polaroid photo or draw wave form and compare wave form of output to vendor illustration.
c.      Make adjustments per vendor instruction manual if required.
2.   UPS on line and loaded.
Yes
No
a.      Repeat steps a, b, and c in (1) above.
b.    Switch “off” Primary feed, monitor Oscilloscope for switching transients, voltage level, and wave from purity.
Make adjustments per static switch vendor instruction manual if required.
c.      Reinitialize UPS inverter per vendor manual, check synchronization indicator and time to synchronize
d.      Perform vendor under voltage and over-current switching checks, using multi-amp test set. Monitor the UPS output with DVM and Oscilloscope. Adjust if necessary.
e.      Connect Spectrum Analyzer to UPS output. Set to 7th harmonic and log vertical scale. Calculate the amplitude of each harmonic. If harmonic amplitudes exceed 4% corrections must be made.
f.       Remove Primary and Alternate power supplies and monitor UPS output. Repower the system with Primary and Alternate power supplies when the output amplitude starts decreasing.

 

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1 Response

  1. October 15, 2018

    […] UNINTERRUPTIBLE POWER SUPPLY FIELD INSPECTION AND ELECTRICAL TEST OF UPS […]

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