DS-E Series（1~6KVA）User’s Manual
25
Cause:
（1）UPS severe overload or output circuit short circuit. Reduce the load to an
adequate amount, or check the cause for short circuit. In many cases, it is
caused by output adapter short circuit or input short-circuit fault owing to
equipment damage.
（2 ）Failure to follow the load start-up sequence which shall begin with
heavy-duty equipment to low-duty ones. Restart UPS and wait till UPS
runs stably; first start heavy-duty equipment and then devices of lower
duties.
Problem 5
UPS works properly after start-up, and automatically shuts off after a certain
period of time.
Cause: battery unit is not charged in time and is working under battery supply
status (not powered or not connected to power grid), thus resulting in battery
under voltage protection of the UPS.
Warning: in the case of UPS battery under voltage protection, please
immediately turn off all switches, and restart the UPS and charge the battery to
full capacity when power supply recovers. Long-period under voltage of the
battery will shorten the service life of the battery.
Problem 6
After working for a certain period, with normal input display, the buzzer gives
intermittent buzzing and displays battery under voltage simultaneously. Cause:
too-low power grid voltage makes the UPS work under battery feed status.
When the battery runs low and under voltage occurs, it enters into protection
status.
Problem 7
UPS is started and working. When power supply breaks down, UPS fails to
output power.
Cause: the battery unit is not connected to main unit or is severely damaged.
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