Rack mount Series UPS
(
1~3kVA
)
User ‘s Manual
-21-
Cause: wrong connection of three UPS input wires, for example, zero line or fire
wire is connected to UPS earth wire (case
)
; or wrong connection of three UPS
output wires.
Problem 3
After UPS is started, it outputs AC 220V, yet it's working under bypass status
("BYPASS" keeping lighted).
Possible cause: too-heavy load sustained by the device which exceeds rated
power of the UPS. In such cases, relieve the load to the UPS, or use a UPS of
higher rated power capacity. If it is a temporary bypass status caused by start-up
impact of the load, and returns to proper status automatically, that's normal
operation.
Problem 4
Display and output of the UPS are normal after start. However, the output stops
as soon as load is connected to it.
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
low-voltage protection of the UPS.
Warning: in the case of UPS battery low-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 low-voltage of the battery will shorten
the service life of the battery.
Problem 6
