6 Maintenance and Troubleshooting
IST Series UPS (10kVA-200kVA)
User Manual
84
NO Abnormal phenomena Possible reason
4 The UPS output
normally after startup,
but once turn on load,
the UPS stop outputting
immediately.
1. The UPS is serious overload or the output circuit is short-
circuit. It is necessary to reduce load to proper capacity
or find the reason of short-circuit. Common reason is
output socket is short circuit or input short circuit caused
by device damage.
2. The load is not started according to the sequence from
large power device to small power device. You should
restart the UPS. After the UPS run stably, start the load
according to the sequence from large power device to
small power device.
5 The UPS work normally
after startup, but some
time later, the UPS shut
down automatically.
At the status of battery supply power, the battery is runs out
and system protects for battery under-voltage, the UPS
shut down automatically. This phenomenon is normal.
Once mains normal, system will start and charge battery
automatically.
Warning: if the battery stays in under-voltage status for long
time, it will influence the battery service life. After battery
under-voltage protection, if mains cannot recover in a long
time, please disconnect the battery breaker to protect
battery and restart the UPS and fully charge the battery
once mains recovers.
6 After startup and work a
period of time, buzzer
long beeps and the
touch screen shows
battery low-voltage.
The mains voltage is too low, and the UPS works in battery
inverting status, finally, the battery is under-voltage and
causes under-voltage protection.
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