N1C NE Series, User Manual

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NE Series (20-30kVA)
User Manual Chapter 6 Troubleshooting
No. Phenomenon Possible reason
9 There is mains, but the buzzer
beeps intermittently, mains
indicator is off. Voltage or frequency of mains exceeds the range of
UPS.
10 Under mains status, the UPS
works normally; however, after
power outage, the UPS work
normally but the device stops. Bad grounding causes the float voltage between neutral
wire and grounding wire being too high.
11 All the indicators on the panel
of the UPS are not lit on. The connection of display controlling board of the UPS
is bad or failure.
6.3 Emergency Troubleshooting

Emergency for the fault of signal-unit
When the single-unit faults, it is necessary to close the power supply of UPS by OFF button on
the panel. If necessary, close the user load, and disconnect the input/output switch of UPS, which
is to avoid further damage of the UPS.

Emergency for the fault of UPS 1 and UPS 2 in series backup system
When the UPS 1 of the series backup system fault, it is necessary to close the power supply of
UPS1 by OFF button on the panel. At the same time, disconnect the mains input switch and battery
switch of UPS 1 (UPS1 or battery cabinet). Inform the engineering technician to maintain.
When the UPS 2 fault, it is necessary to close the power supply of UPS2 by OFF button on the
panel. At the same time, disconnect the mains input switch and battery switch of UPS 2 (UPS2 or
battery cabinet). Inform the engineering technician to maintain.

Emergency for the fault of the single-unit in parallel system
When the single-unit in parallel system fault, it is necessary to close the power supply of UPS by
OFF button on the panel. Then disconnect the switch of AC input, output and battery (UPS 1or
battery cabinet). Inform the engineering technician to maintain.