IST Series UPS (10kVA-200kVA)
User Manual
6 Maintenance and Troubleshooting
85
NO Abnormal phenomena
Possible reason
7
When there is mains,
the
UPS
output
normally, when there is
no mains, the UPS is
with no output.
1. Battery fault or the battery group is serious damaged.
2. Charger fault. The battery cannot be charged and
causes battery energy insufficient.
3. Battery wire is not well connected or the contact of wire
terminal is not good.
4. Battery breaker is not closed.
5. After serious overload of UPS, the UPS is not restarted,
which causes the UPS stay in bypass output status.
8
Buzzer long beeps,
DC/AC indicator on, the
UPS turns to bypass to
supply power.
See the fault information on touch screen.
9
There is mains, but
buzzer
beeps
intermittently.
The voltage or frequency of mains exceed the allowable
range of the UPS.
10
At mains status, the
UPS works normally,
once power outage, the
UPS works normally
but load system halt.
The grounding is not so good and the float voltage between
neutral wire and grounding wire is too large.
11
FAULT indicator of a
power unit is on.
The power unit is fault, replace it in time.
6.4.2 Emergency Dispose for System Fault
How to deal with the system fault in emergency
When system fault, shut down the power supply of UPS by the touch screen, if necessary,
close the user load and disconnect the input and output breaker of the UPS to avoid further
damage for the UPS. Inform the engineering technicist to maintain.
How to deal with the fault of single power unit in emergency
When some power unit fault, it will be insulated with system automatically, and generally, it
will not influence the system normal operation, but it will decrease the redundancy degree of