Liebert NX UPS System user manual UPS messages, Message Description / Suggested Action if any

Operator Control Panel and Display

Current Record Window

Keeps a log the events that resulted in the current mode of operation. Ignores transient conditions that have been resolved.

Use “page” (F1) and up / down arrow to read the events.

For a complete history log, refer to the Records tab of the Menu and Data Window. Refer to Table 22 for a complete list of supported status messages.

7.2All Status and Event Messages Displayed on the UPS Front Panel

This is the complete list of UPS events and status messages supported for display in either the Record window (Historic data) or in the Current window (Prevailing data) as described in 7.1.4 - LCD Moni- tor and Menu keys.

Table 22	UPS messages
Message		Description / Suggested Action (if any)
Inverter Comm. Fail		Internal RS485 communication failure between monitor and inverter
Rectifier Comm. Fail		Internal RS485 communication failure between monitor and rectifier
		The CAN communication between different UPSs within a parallel system fails.
Parallel Comm. Fail		1.Check if there are some UPSs not powered on in the parallel system. If so, power on these
		UPSs and check if the alarm disappears.
		2. Press Fault Clear push button.
Battery Overtemp.		The Battery temperature is over limit. Check the battery temperature and ventilation
Ambient Overtemp.		The Ambient temperature is over limit. Check the ventilation of UPS room.
Battery Fault		Battery detected faulty (Reserved)
Replace Battery		Battery test failed, Battery should be replaced.
		Before the end of discharge, battery undervoltage pre-warning should occur. After this pre-
Battery Low Pre-warning		warning, battery should have the capacity for 3 minutes discharging with full load. The time is
		user-configured from 3 to 60 minutes.
		Shut down the load in time.
Battery End of Discharge		Inverter turned off due to low battery voltage. Check the utility failure and try to recover it.
Mains Volt. Abnormal		Mains Voltage exceeds the upper or lower limit and results in rectifier shutdown.
		Check the input line-to-neutral voltage amplitude of rectifier.
Mains Undervoltage		Mains Voltage is undervoltage with derated load.
		Check the input line-to-line voltage amplitude of rectifier
Mains Freq. Abnormal		Mains frequency is out of limit range and results in rectifier shutdown.
		Check the rectifier’s input voltage frequency
Rectifier Fault		Rectifier detected faulty. Rectifier shuts down. Battery discharges.
Rectifier Overtemp.		The temperature of heat sink is too high to keep the rectifier running.
		The UPS can recover automatically. Check the environment and ventilation.
Batt. Contactor Fail		Battery contactor or circuit breaker not responding to control signals.
Batt. Charger Fault		The voltage of the battery charger is too high.
Control Power 1 Fail		UPS operates but Redundant Control Power is not available.
Mains Phase Reversed		AC Input phase sequence is reversed.
Rectifier Overcurrent		Rectifier is overloaded.
Soft Start Fail		Rectifier could not start due to low DC bus voltage
		This alarm is triggered by an inverter software routine when the amplitude or frequency of
		bypass voltage is beyond the normal range.
		The amplitude threshold is fixed for positive and negative 10% rating.
		This alarm automatically resets once the bypass voltage goes normal.
Bypass Unable to Trace		1. First verify that the bypass voltage and frequency displayed on the panel is within the
		selected range. Note here the rated voltage and frequency are specified by “Output voltage
		level” and “Output frequency level” respectively.
		2. If the displayed voltage is believed to be abnormal, then verify the bypass voltage and
		frequency presented to the UPS. Check the external supply if it is found to be faulty.

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