Table of Contents
Advertisement
(1-10kVA) UPS IST3
User Manual
Fault phenomenon
intermittently.
After finishing installing UPS,
connecting with power will fuse
the fuse or cause power cut.
When starting UPS, the LCD
display and output are normal.
But when connecting with load, it
will stop outputting immediately.
Buzzer long beeps, fault indicator
is on, UPS works in the bypass
mode and inverter failure.
Usually, UPS works normally.
When UPS powers off, it doesn't
transfer to battery mode or it
transfers to battery mode and
battery has under-voltage
Possible reason
beyond the allowable input range of UPS;
3)
Check if the over-current protector in the rear
panel is sprung. If yes, press the over-current
protector switch.
Output short circuit or wiring for three phase of output
error.
1)
UPS is overload seriously or the output circuit is
short-circuit. It should reduce load to the proper
capacity or find the short-circuit reason. The
common reason is that the output changeover
socket is short-circuit or the input is short-circuit
after UPS failure.
2)
It doesn't follow the startup sequence that "high
power device → small power device" to start
load. Restart UPS. When UPS works steadily,
start high power device first, and start small
power device successively.
1)
The output is overload. The load is too heavy,
which is beyond the rated power of UPS. It
should reduce load or select UPS with larger
power capacity. It is normal that UPS works in
the bypass mode temporarily for load startup
impact and then recover automatically
2)
UPS over-temperature protection. Check if the
air inlet and air outlet of UPS is blocked or the
working temperature of UPS is beyond the
allowable range.
1)
Battery aging, battery capacity loss or it needs to
replace battery.
2)
Battery charger fault. Usually, it can't charge
battery.
39
Advertisement
Table of Contents
