Perform scheduled field maintenance of UPS systems. Testing and inspections will be performed in accordance with manufacturers' instructions and service manuals, ANSI/IEEE standards and Full Fill recommended standard maintenance guidelines for UPS systems.
Inspect UPS system for physical damage.
Compare equipment nameplate information and connections with single line diagram and report any discrepancies.
Check tightness of all control and power connections.
Perform transfer operation.
Measure contact resistance in normal and alternate source position.
Set and calibrate in accordance with manufacturer's literature.
- simulating loss of normal power
- loss of emergency power
- return of emergency power
- return of normal power
SCRs for correct operation
Battery for correct voltage
Monitor and verify correct operation and timing of all relays
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