NS3000 UPS 60KVA~120KVA User Manual
39
2. Whether the ventilation channel is blocked.
3. Whether fan fault happens.
4. Whether the input voltage is too low.
35
Fan Fail
At least one fan fails in the N# power module.
36
Output Over load The N# Power Module Output Over Load. This alarm appears
when the load rises above 100% 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.
37
Inverter Overload
Tout
N# Power Module Inverter Over Load Timeout. The UPS
overload status continues and the overload times out.
Note:
The highest loaded phase will indicate overload timing-out first.
When the timer is active, then the alarm “unit over load” should
also be active as the load is above nominal.
When the time has expired, the inverter Switch is opened and
the load transferred to bypass.
If the load decreases to lower than 95%, after 2 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.
38
Inverter
Over
Temp.
The N# Power Module Inverter Over Temperature.
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 in the inverter IGBTs.
The UPS recovers automatically after the over temperature
signal disappears.
If over temperature exists, check:
Whether the ambient temperature is too high.
Whether the ventilation channel is blocked.
Whether fan fault happens.
Whether inverter overload time is out.
39
On UPS Inhibited
Inhibit system transfer from bypass to UPS (inverter). Check:
Whether the power module’s capacity is big enough for load.
Whether the rectifier is ready.
Whether the bypass voltage is normal.
40
Manual Transfer
Byp
Transfer to bypass manually
41
Esc
Manual
Bypass
Escape from “transfer to bypass manually” command. If UPS
has been transferred to bypass manually, this command
Summary of Contents for NS3000 Series
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