UPS Status Messages
33
45 Byp. Abnormal Shutdown
1. When inverter overload times out and bypass is abnormal, the inverter will turn off and
the output will shutdown.
2. When bypass goes abnormal during the 5 minutes span just after an overload transfer
from inverter side.
3. When bypass goes abnormal when the bypass is feeding the load and an overload
alarm occurs.
Note: This alarm usually occurs with the accompany of “Bypass abnormal”.
Suggested Action
Confirm that the alarm is genuine by checking the amplitude and frequency of bypass
voltage.
1. If the alarm is genuine
a. check the wiring of bypass circuit.
b. look over the current and history record to look for other relative alarm such as “unit
over load”, “unit over load timeout”, “transfer time-out”. Follow relevant procedure to
deal with the alarms.
2. If the alarm is not genuine
a. verify that the bypass up and down limits programmed via the configuration
software is appropriate and reprogram if necessary.
b. measure the signal to the U1 board. If this is correct then replace the U1 control
Board; else replace the M4 measure board.
46 Reserved
47 Inverter Over Current
The current of inverter IGBT is over limit. This alarm is triggered by a hardware signal
emitted by the gate driving chip.
Suggested Action
1. Check for a reasonable cause for the fault by examining for shorts/burns, etc., in the:
a. output filter capacitors and associated wiring.
b. inverter IGBTs and associated cabling.
2. If no reasonable cause is found then:
a. if the fault signal is illuminated on the M4 board determine the cause of the
erroneous overload detection and repair/replace as necessary.
b. if the fault signal to the U1 board is OK, then replace the U1 control board.
Restart the inverter after RESET the fault.
48 Bypass Phase Reversed
The phase sequence direction of 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.
Suggested Action
1. First verify that the phase rotation of the bypass supply presented to the UPS is correct,
and rectify it if it is found to be in error.
2. Measure the signal to U1 control board. If this is correct then replace U1 Board; else
replace or repair M4 measure board.
If the signal to the U1 board is missing, there shall be other active alarms concerning the
bypass voltage.
49 Load Impact Transfer
Transfer to bypass as a result of load impact.
The UPS can recover automatically.
Suggested Action
Suggest user avoid applying large load abruptly and avoid short circuit.
50 Transfer Time-out
The load is on bypass because the output overload transfer and retransfer is clamped to
the set times during the current hour.
The system will transfer back to inverter side within an hour.
Suggested Action
1. Verify that the transfer times programmed via the configuration software is appropriate
and reprogram if necessary.
2. There should be other relative fault present in the history record such as “unit over
load”, “unit over load timeout”. Follow relevant procedure to deal with the alarms.
3. Suggest user do not apply frequent overload to make the UPS work in bypass mode
without protection.
51 Load Sharing Fault
UPS working within a parallel system are not sharing load current correctly.
Suggested Action
1. Verify the power connection of output during the parallel system.
2. Verify the connection status of parallel cables.
3. Verify the waveform or stability of bypass voltage.
4. Check if there are any errors on the parallel board, change it as necessary.
Table 8 UPS status messages (continued)
No. Event Message Description / Suggested Action (if any)
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