Alarms and Events
990-4043
User Guide APC Silcon 10-40kW 400V UPS 25
5.3 Possible Alarms
Alarms Description Action
1. Peak current limiter active Peak current limiter activated and
UPS switched to bypass operation.
System overload
Check for blown fuses in
installation
2. Bypass power supply fault Fault in redundant PSU for bypass.
UPS still 100% able to operate in
all modes.
Call for assistance
3. Delta current limiter active Input current limiter activated and
UPS switched to bypass operation
Check for overload.
If message is repetitive -
call for assistance
4. Faulty fan Blocked or faulty fan Remove blocking or replace fan
5. High DC warning Switching off big output load If alarm is repeated, reduce load
change
6. High DC shutdown UPS fault Call for assistance
7. Off-button activated Off button or emergency power
shut down activated
–
8. Synchronization error UPS unable to synchronize with
input frequency
Check if phase rotation of mains
input voltage is correct. If OK, call
for assistance
9. Inverter voltage error Inverter average voltage outside
limits (normal message during
system start-up/switch-off
–
10. Parallel synchronization
error
Parallel UPS unable to
synchronize
Check external parallel cables -
call for assistance
11. Inverter current limiter active Inverter overload Reduce UPS output load
12. Overload. Load exceeding
100%
UPS overload Reduce UPS output load
13. Second power supply fault UPS fault
(only systems > 160kW)
Call for assistance
14. Internal power supply fault UPS fault. Only bypass operation
possible
Call for assistance
15. Battery MCCB is off Battery MCCB/fuse not closed or
released
Close MCCB / insert new fuse. If
released again -
call for assistance.
16. **Q004 off** Output switch position for UPS in
parallel
–
17. **Q003 off** External bypass switch position –
18. **Q002 off** UPS output switch position –
19. **Q001 off** UPS input switch position –
20. High temperature of isolation
transformer
Temperature of isolation input/
output transformer, too high
Check fan, check for airflow
obstructions, check for overload
21. High temperature of main static
switch
Temperature of static input switch,
too high
Check fan, check for airflow
obstructions, check for overload
22. High temperature of bypass
static switch
Temperature of static bypass
switch, too high
Check fan, check for airflow
obstructions, check for overload