24 User Guide APC Silcon 10-40kW 208V/480V UPS
990-4034
Alarms and Events
5.2 Displaying the Event Stack5.3 Possible Alarms

NOTICE!

Please note mains = utility

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

Action Description

1. Press and Press the two keys simultaneously to get access

to the events stack

2. Press or Scroll up or down through the event stack

(last message is "No (further) event").

3. Press Displays the time where the event happened.

4. Press Exits the event stack. If not operated the system

will exit the event stack automatically after 30

seconds.