58 Chapter 6 Operator Control And Display Panel
UPS event Meanings
range. Note that the rated voltage and frequency are respectively specified by “Output Voltage” and
“Output Frequency”. 2. If the displayed voltage is abnormal, measure the actual bypass voltage and
frequency.If the measurement is abnormal, check the external bypass power supply.If the alarm
occurs frequently, use the configuration software to increase the bypass high limit set point according
to the user’s suggestions
Inverter Asynchronous
This alarm is triggered by an inverter software routine when the inverter and bypass waveforms are
misaligned by more than 6 degrees of phase angle.The amplitude is ±10% of rated value.The alarm
will automatically reset if the alarm condition ceases.
1. First check if “Bypass Unable to Trace” or “Bypass Abnormal” alarm exists.If the alarm exists, first
clear the alarm.
2. Check if the bypass voltage waveform is normal. If the bypass voltage waveform has severe
distortion, please ask the user to confirm this and find a solution
Inverter fail The inverter output voltage is abnormal and the load transfers to bypass
Inverter Overtemp.
The temperature of the inverter heat sink is too high to keep inverter running.This alarm is triggered
by the signal from the temperature monitoring device mounted on the inverter heatsink.The UPS
recovers automatically after the over temperature signal disappears and after 5 minutes delay.
If over temperature exists, check:
1. Whether the ambient temperature is too high.
2. Whether the ventilation channel is blocked.
3. Whether fan fault happens
4. Whether inverter overload time is out
Fan fault At least one of the cooling fans fails
Inverter Relay Fail
At least one of the static switches on the inverter side is open or short circuit.This fault is locked until
power off
Bypass STS Fail
At least one of the static switches on the bypass side is open or short circuit.This fault is locked until
power off
Operation Invalid This alarm is triggered when an invalid operation occurs
Output Fuse Fail At least one of the output fuses is blown.The inverter shuts down and the load transfers to bypass
Unit Over load
This alarm appears when the load rises above 105% of nominal rating.The alarm automatically resets
once the overload condition is removed.
1. Check which phase has overload through the load (%) displayed in LCD so as to confirm if this
alarm is true.
2. If this alarm is true, measure the actual output current to confirm if the displayed value is correct.
Disconnect non-critical load.In parallel system, this alarm will be triggered if the load is severely
imbalanced
System Over load
This alarm appears when the total load rises above 105% of the nominal rating of the UPSs.The
alarm automatically resets once the overload condition is removed. Check which phase has overload
through the load (%) displayed in LCD so as to confirm if this alarm is true. If this alarm is true,
measure the actual output current to confirm if the displayed value is correct.
Disconnect non-critical load.In parallel system, this alarm will be triggered if the load is severely
imbalanced
Unit Over load Timeout
The UPS overload status continues and the overload times out.
Note:
1.
The highest loaded phase will indicate overload timing-out first.
2. When the timer is active, then the alarm “unit over load” should also be active as the load is above
nominal.
3. When the time has expired, the inverter Static Switch is opened and the load transferred to bypass.
The inverter shuts down and will restart after 10 seconds.
4. If the load decreases to lower than 95%, after 5 minutes, the system will transfer back to inverter
mode.Check the load (%) displayed in LCD so as to confirm if this alarm is true.If LCD displays that
overload happens, then check the actual load and confirm if the UPS has over load before alarm
happens
Byp. Abnormal Shutdown The voltage of both the bypass and inverter is abnormal.The load power is interrupted
Inverter Over Current The inverter has over currents
Bypass Phase Reversed
Bypass Phase Rotation is Reversed.Under normal condition, Phase B lags behind phase A by 120
degree and phase C lags behind phase B by 120 degrees.
Check if the bypass input phase rotation is correct.Correct the wrong phase rotation
Load Impact Transfer
The system transfers to bypass as a result of load impact. The UPS can recover automatically.Start
the load according to sequences to reduce the load impact to inverter
Transfer Time-out The load is on bypass because the output overload transfer and re-transfer is fixed to the set times
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