UPS Failure – Common Causes

UPS failure most common causes are:

  1. Power Outage lasted LONGER than the battery autonomy of the UPS,
    hence the UPS died as it had run out of battery stored power
  2. The UPS has never been serviced or only randomly serviced.
    NO maintenance contract in place – Been living on hope not serviced.
  3. UPS Placed in correctly into bypass and fuses have been blown
  4. The UPS is overloaded. When the GRID power failed the amount of
    power required was MORE then the UPS could provide, so the UPS
    went into internal bypass. As there was NO GRID power the UPS died.
  5. Old batteries had not been replaced when the power outage occurred
    so the UPS had no stored power to rely on- The UPS died
    immediately that it switched to the batteries for power
  6. UPS has frequency issues-
    These occur when the UPS is grossly under loaded. For example a
    100kVA UPS has only a 10kVA load.
  7. UPS battery charger has failed and has not been re-charging the
    batteries- No one noticed.
  8. AC capacitors have failed –AC capacitors require replacement
    regularly. Refer to manufacturers specifications. Every 5 -7 years as a
    rule of thumb
  9. DC capacitors have failed –DC capacitors require replacement
    regularly. Refer to manufacturers specifications. Every 5 -7 years as a
    rule of thumb
  10. IGBT’s failed. Electrical components fail over years of use. Without
    regular replacement they will fail
  11. The UPS is old ; beyond it’s sell by date. Electrical components fail
    over years of use. Without regular replacement they will fail
  12. Dust built up inside the UPS has causing components to overheat and
    fail
  13. Fans have failed and caused the UPS to shut down
  14. Water damage – Internal components have shorted out
  15. NO air conditioning and the UPS has overheated and shut down
  16. UPS has the load all on a single phase leaving the other two phases
    without load. Over time this causes internal issues within the UPS
  17. Rectifier failure or rectifier fuses have blown
  18. Inverter failure or inverter fuses have blown

Better to service your UPS regularly – Get a service Contract!

Call Power Continuity on 0845 055 8455
for UPS Systems service

Search – Knowledge Base

Talk to Us: