Liebert NXC User Manual page 45

Liebert NXC
Alarm message
Bypass phase reverse
Load impact transfers
bypass
Transfer time-out
Bus abnormal
DC bus over voltage
Bypass over current
Setting save error
Input Disconnect Fault
Protocol version clash
Manual on
Manual off
EPO
Transfer confirm
Transfer cancel
Fault clear
Alarm silence
Turn on fail
Alarm silence cancle
Bypass mode
Normal mode
Battery mode
Check UPS output
Battery float charging
Battery boost charging
Battery discharging
Battery period testing
Batt. capacity testing
Batt. maint. testing
UPS system testing
Inverter in setting
Rectifier in setting
Battery reverse
No battery
Auto start
REC FLASH UPDATE
INV FLASH UPDATE
MONITOR FLASH
UPDATE
DSP softwar error
Operation invalid and
Bypass unable to trace
Note:
If the alarm is caused through setting the software value by Emerson authorized engineer, and when you wish to change the setting
values, please get in touch with the Emerson local customer service centre
User Manual 10H52188UM51 - Rev. 1 - 09/2011
The phase sequence direction of the bypass voltage is reversed. Normally, the phase of phase B lags 120
degrees behind phase A, and the phase of phase C lags 120 degrees behind phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it if the fault is
found
A transfer to bypass occurred due to a large step load. The UPS will recover automatically. Turn on the load
in sequential order for reducing the step load of the inverter
The load is on bypass power due to the excessive number of transfers that occurred within the last hour. The
UPS will recover automatically and will transfer the load to inverter power within an hour
DC bus voltage is abnormal. Inverter shuts down. Load transfers to bypass
Rectifier and inverter are off because the DC bus voltage is too high. Check whether there is a fault in
rectifier side. If not, check whether there is an overload. After recovering the fault, restart the inverter
Bypass current is over limit above 135% rating. The UPS just alarms without any action
Historical records are not saved (Reserved)
AC mains input neutral line is not checked out
Firmware incompatibility between monitor board and Digital Signal Processor (DSP) board
Manually turn on the inverter through pressing ON on the operation and display panel
Manually turn off the inverter through pressing OFF on the operation and display panel
Press the EPO button directly or receive the external EPO command
Prompt to press the Enter button to acknowledge that an interrupted load transfer to bypass will happen
Prompt to press the ESC button to avoid that an interrupted load transfer to bypass will happen
Press FAULT CLEAR
Press ALARM CLEAR
Inverter failed to turn on manually. The reason may be the invalid operation (maintenance bypass air
breaker closed), or DC bus or rectifier not ready
Press FAULT CLEAR or ALARM CLEAR
The UPS is in Bypass mode
The UPS is in Normal mode
The UPS is in Battery mode
1. Whether the EPO terminal is on the dry contact port 4
2. Whether the LCD displays "Parallel comm. Fail"
Battery status (floating charge mode)
Battery status (boost charge mode)
Battery status (discharge mode)
Automatically periodic battery maintenance test (20% capacity discharge)
User initiated battery capacity test (100% capacity discharge)
User initiated maintenance test (20% capacity discharge)
User initiated UPS system self-test
Inverter is starting up and synchronizing
Rectifier is starting up and synchronizing
Reconnect the battery, and check the battery wiring
Check the battery and battery wiring
UPS is off when the battery discharges completely, the inverter will automatically start after the mains is
restored
Ongoing update of rectifier firmware
Ongoing update of inverter firmware
Ongoing update of monitor firmware
Inverter software does not match the rectifier software
Alarm combination, when the two alarms appear at the same time, the UPS I/O cable connection mode is
not suitable with the setting mode (3-in 3-out or 3-in 1-out)
Operation and Display Panel
Description
45