Liebert 1000kVA Auto Retransfer, Primed, Manual Reset, Static Switch, Unable, Bypass Not

Operation

Table 9	Alarm messages - meaning and corrective action (continued)
Alarm			Cabinet	Special
Message			Location	Functions	Meaning and Corrective Action
BYPASS (Cont’d.)
Auto Transfer to					The critical load has been automatically transferred to the bypass line.
			SCC	D, E, F	Use the History Status screen to determine the cause for the transfer.
Bypass					Clear all of the alarms before attempting to retransfer the load from
					bypass to UPS.
Auto Retransfer					An automatic retransfer will be initiated when the OK to Transfer condition
			SCC	—	has been present for 10 seconds, if the overload has dropped below
Primed
					100% of the rated SCC current and if enough UPS modules are on-line.
					A manual retransfer is required. Either a system overload condition has
Manual Reset/					lasted more than 5 minutes or no more auto-retransfer attempts are
			SCC	—	available. Note that this alarm is only used if auto-retransfer attempts are
Retransfer
					enabled.
					Perform a manual retransfer if all necessary conditions are present.
					The UPS output is not synchronized to the bypass power source. The
					static bypass switch is disconnected or it has failed internally.
Static Switch			SCC	D, S	Emergency and overload transfer to the bypass source is not available.
					Manually set the Static Switch Disconnects to ON (closed) if the static
Unable
					switch is disconnected. If the alarm conditions are automatically
					corrected, reset the alarm to clear it. Contact Liebert Global Services if the
					alarm stays on.
Bypass Not			SCC	—	The bypass power source voltage is not within specifications.
Available					Correct the bypass AC power source.
					The power conductors on the bypass line are not wired to the UPS in the
					required sequence. This alarm should appear only during initial start-up or
Bypass Phase			SCC	D, L, S	after a repair to the source power system.
Sequence Wrong					Disconnect power from the bypass line and correct the wiring. A Liebert
					Global Services representative must be present during initial start-up of
					your UPS System.]
UPS SYSTEM
Input Current					At least one input phase differs from the average current by 10% or more
			MMU	D, E	for four (4) hours. Contact Liebert Global Services. If the condition
Unbalance
					persists, transfer the load to the bypass line.
			SCC	D, L, S	The logic control power supply from the UPS output is not operating
Control Power					properly. The UPS module continues operating but will shut down if the
Fail			MMU	D, L, S	input power fails. The SCC continues operating but will shut down if the
					bypass power fails. Contact Liebert Global Services immediately.
Output Over/					Output frequency differs from the nominal (60 Hz) by more than 0.5 Hz.
			SCC	D, L, S	No transfer or shutdown occurs.
Under Frequency
					Contact Liebert Global Services at once.
					The UPS system output voltage is under the minimum (-12%) deviation
Output			SCC	D, F, L, S	from nominal. The load automatically transfers to the bypass line.
					If the alarm condition is no longer present, reset the alarm and retransfer
Undervoltage
					the load from bypass to UPS. Contact Liebert Global Services if alarm
					persists.
					The UPS system output voltage is above the maximum (+10%) deviation
Output					from nominal. The load automatically transfers to the bypass line. All UPS
			SCC	D, F, L, S	modules are taken off-line and are shut down.
Overvoltage
					Contact Liebert Global Services at once. Do not attempt to reset circuit
					breakers.
			SCC	D, R, S	The UPS output current exceeds the rated system load current. This
Overload					condition causes an alarm only, the UPS does not shut down.
			MMU	D, S	Determine cause of the overload. Reduce the load until the overload
					condition is corrected. Reset the UPS alarm.
Table 9 Abbreviations
D = auto-dial;		L = latches
E = logs only;		R = remote
F = freezes;		S = summary

D* = auto-dial initiated by Auto Transfer to Bypass if load is on UPS when alarm occurs

D# = auto-dial initiated through Module N (1-6) off-line

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