UPS Failure – Common Causes
UPS failure most common causes are:
- Firstly, power outage lasted LONGER than the battery autonomy of the UPS,
hence the UPS died as it had run out of battery stored power - Secondly, the UPS has never been serviced or only randomly serviced.
NO maintenance contract in place – Been living on hope not serviced. - UPS Placed in correctly into bypass and fuses have been blown
- 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. - 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 - UPS has frequency issues-
These occur when the UPS is grossly under loaded. For example a
100kVA UPS has only a 10kVA load. - UPS battery charger has failed and has not been re-charging the
batteries- No one noticed. - AC capacitors have failed –AC capacitors require replacement
regularly. Refer to manufacturers specifications. Every 5 -7 years as a
rule of thumb - DC capacitors have failed –DC capacitors require replacement
regularly. Refer to manufacturers specifications. Every 5 -7 years as a
rule of thumb - IGBT’s failed. Electrical components fail over years of use. Without
regular replacement they will fail - The UPS is old ; beyond it’s sell by date. As a result, electrical components fail
over years of use. Without regular replacement they will fail - Dust built up inside the UPS has causing components to overheat and
fail - Fans have failed and cause the UPS to shut down
- Water damage – Internal components have shorted out
- NO air conditioning and the UPS has overheated and shut down
- UPS has the load all on a single phase leaving the other two phases
without load. Eventually this causes internal issues within the UPS - Rectifier failure or rectifier fuses have blown
- Inverter failure or inverter fuses have blown
Better to service your UPS regularly – Get a service Contract!