44 Chapter 4 Operation And Display Panel
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
Prompt Meaning
Turn on more UPS to carry current load
The number of paralleled inverters already turned on is insufficient to carry the
current load, thus more inverters are required
Battery will be depleted, confirm or cancel
The battery maintenance test discharges the battery completely. A prompt screen
will appear to require your confirmation. Cancelling the test will end the battery
discharge and return to the Normal mode
System self-test finished, everything is ok
No operation is required
System self-test finished, please check the
current warnings
Check the current alarm message
Enter control password
Control password is required for battery test or UPS test
Battery self-test condition is low, please
check battery state and load level
Battery test condition is not met. Please check whether the battery is in boost
charge state and the load level is more than 20%
Forcing charge condition is low, please
check battery state
The prompt appears when you select the forcing charge command while the
forcing charge condition is not met (such as no battery, charger failure)
Check the wiring according to the settings,
power-off takes effect, 3-phase (1-phase)
output
After the menu ‘3 Phase Output or 1 Phase Output’ is set, you can power off the
system completely, and then power on the system again after the wiring is
changed according to the settings
4.5 UPS Alarm Message List
Table 4-8 gives all UPS alarm messages based on the ‘Event’ and ‘Records’ menus.
Table 4-8 UPS alarm message list
Alarm message
Description
Inverter comm. fail
Communication failure between the internal monitoring board and the inverter
Rectifier comm. fail
Communication failure between the internal monitoring board and the rectifier
Parallel comm. fail
The communication failure between different UPSs in the parallel system.
1. Check whether some UPSs are not powered on in the parallel system. If so, power on these UPSs
and check whether the alarm disappears.
2. Press the FAULT CLEAR button
Battery fault
Battery is depleted (reserved)
Battery replaced
Battery test failure, and the battery should be replaced
Battery low
pre-warning
Before the end of the discharge, battery undervoltage pre-warning may occur. After this pre-warning, the
battery should have the capacity for three minutes discharging with full load. The time is user-configured
ranging from three minutes to 60 minutes. Shut down the load in time
Battery stop
discharge
Inverter is off due to the battery end voltage. Check the mains failure and try to recover it
Main volt. abnormal
Mains voltage exceeds the upper or lower limit and results in rectifier shutdown. Check the input phase
voltage of the rectifier
Main undervoltage
Mains is undervoltage, derate for running. Check the input line voltage
Main freq. abnormal
Mains frequency is out of the limit range and results in rectifier shutdown. Check the input frequency
Rectifier block
Rectifier failure. The rectifier shuts down and the 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
Battery charger fault
Battery charger is over voltage
Control power 1 fail
UPS operates but the control power is not available
Main phase reversed
AC input phase sequence is reversed
Rectifier overcurrent
Rectifier is over current
Soft start fail
Rectifier cannot start due to the DC bus low voltage
Bypass unable to
trace
This alarm is triggered by an inverter software program when the amplitude or frequency of bypass
voltage is beyond the normal range. The amplitude threshold is fixed for ±10% rating.
This alarm will automatically recover when the bypass voltage is normal.
1. First verify that the bypass voltage and frequency displayed on the LCD are within the selected range.
Note that the rated voltage and frequency are specified by the ‘Output Voltage Level’ and ‘Output
Frequency Level’ respectively.
2. If the displayed voltage is abnormal, please verify the actual bypass voltage and frequency presented
to the UPS. Check the external power if any fault is found
