UPS Maintenance

UPS SCOPE OF WORK

UPS Major Preventive Maintenance Inspection

  1. Perform a complete visual inspection of the equipment including subassemblies, wiring harnesses, contacts, cables and major components. Check air filters for cleanliness.
  2. Check module(s) completely for the following (if applicable):
    1. Rectifier and inverter snubber boards for discoloration.
    2. AC Capacitors for swelling or leaking oil.
    3. DC Capacitor vent caps that have extruded more than 1/8”.
    4. Record all voltage and current meter readings on the UPS module and the system control cabinet (when applicable). Verify with calibrated DVOM.
    5. Measure and record harmonic trap filter currents.
    6. Check the inverter and rectifier snubbers for burned or broken wires.
    7. Check all nuts, bolts, screws and connectors for tightness and heat discoloration.
    8. Check fuses on the DC capacitor banks for continuity (if applicable).
    9. With customer approval, perform operation test of the system including unit transfer, battery discharge and generator interface test.
    10. Calibrate and record all electronics to system specifications.
    11. Measure and record all low-voltage power supply levels.
    12. Measure and record phase-to-phase input voltage and currents.
    13. Review, clear and reset all diagnostic alarm histories, where applicable.
    14. Record all input, output, and battery voltages and currents.
    15. Furnish completed data sheets and report any problems found during the PM inspection.
    16. Review system performance with customer.

Note 1:  Preventive Maintenance usually requires a module shut-down to ensure electrical connection integrity.
Note 2:  Customer should check air filters monthly for cleanliness and replace as necessary.
Note 3:  Above maintenance does not include System Control Cabinet, Power Tie Cabinet, Breaker Cabinets, Load Bus Sync or Maintenance Bypass Cabinets.

UPS Minor Preventive Maintenance Inspection

  1. Perform a complete visual inspection of the equipment including subassemblies, wiring harnesses, contacts, cables and major components. Check air filters for cleanliness.
  2. Check module(s) completely for the following (if applicable):
    1. Rectifier and inverter snubber boards for discoloration.
    2. Power capacitors for swelling or leaking oil.
    3. DC capacitor vent caps that have extruded more that 1/8”.
    4. Record all voltage and current meter readings on the UPS module and the system control cabinet (when applicable).
    5. Measure and record harmonic trap filter currents.
    6. Measure and record phase-to-phase input voltage and currents.
    7. Review system performance with customer.
Contact one of our experienced Sales Professionals for details