Liebert 30-130kVA Operation And Maintenance Manual page 78

Operation
Once the "UPS Sign Off" is acknowledged, it is stamped with RTC time and date. This step must be
performed by LGS personnel. The software will keep track of the elapsed hours from that point on by
subtracting the current time and date from the sign off time and date.
Accumulated Operating Hours on UPS
With output contactor closed and load KVA greater than 1%, software accumulates operating hours
that the load is supported by UPS.
Accumulated Operating Hours on Bypass
With bypass contactor closed and load KVA greater than 1%, software accumulates operating hours
that the load is supported by Bypass.
Accumulated Backup Hours
With Battery breaker closed and battery discharge current greater than 2% rated (Ibatt), software
accumulates Hours or fraction of hours (i.e. 0.2, 1.9) that the load is supported by the battery system.
Ibatt > 0.02 (Rated KW)/0.96/Vbatt
Accumulated # of Brown Outs
An "Input Undervoltage" condition must exist for more than 5 minutes. During this time "Input Line
Fail" condition must not be active. Once a count is made, allow 30 minutes to re-arm the counter.
Accumulated # of Manual Transfers
User initiated and successful transfers to bypass commanded from the manual transfer screen. MM
checks the status of output and SBS contactors to verify a transfer has successfully taken place.
Accumulated # of Manual Retransfers
User initiated and successful retransfers to inverter commanded from the manual transfer screen.
MM checks the status of output and SBS contactors to verify a transfer has successfully taken place.
Accumulated # of All Transfers
All transfers, manual and auto are counted.
Accumulated # of All Retransfers
All retransfers, manual and auto are counted.
Accumulated # of Overload Conditions
For detection of an overload condition, software monitors 6 alarms (Inv Ovld phA, Inv Ovld phB, Inv
Ovld phC, SBS Ovld phA, SBS Ovld phC, SBS Ovld phC). It increments the count if one or more of
these alarm conditions are reported.
Accumulated # of Unsuccessful Auto Retransfers
The count is incremented upon receipt of an "Auto Retransfer Failed" alarm from UPSC (UPS Control
board).
Average Load%
Running average of 256 KVA samples over 256 seconds.
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