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P O W E R I N G T E C H N O L O G Y
Document Number: MS0031-MAN rev. 7
guardian_access_ms31-man-rev7-0521.indd
6.2 Troubleshooting
This troubleshooting chapter helps to determine the cause of the problem and suggests
possible repair solutions. If the first step of the recommendation does not solve the problem
continue to the next one.
NOTE
If the malfunctioning of the system persists, please contact UNIPOWER technical
support.
NOTE
For a description of Alarms and Messages generated by the system controller see
the Alarms/Messages section of the appropriate controller manual:
ACX Advanced:
https://www.unipowerco.com/pdf/acc-man.pdf
By default, alarms are set to be indicated with a red light (higher priority) and messages
with a yellow light (lower priority).
Fault
Possible Cause
Suggestion/Solution
Low System
Voltage
Module failure.
Loss of AC power.
Load exceeds module capacity.
Replace faulty module.
Verify AC input connection.
Add module to system.
High System
Voltage
Module failure.
System voltage exceeds the set limit.
Replace the faulty module.
Check the High Voltage Alarm limit
setting.
Mains Error
AC supply OFF on one rectifier in the
system with one plugged in rectifier.
AC supply OFF on at least two
rectifiers in the system with minimum
two plugged in rectifiers.
Verify that the AC input breaker is
ON.
Verify AC input connection.
AC Low Voltage
AC voltage drops below the set limit.
Verify the Low AC voltage limit
setting.
Verify AC Input connection.
Verify AC Input voltage.
AC High
Voltage
AC voltage rises above the set limit.
Verify the High AC voltage limit.
Verify the AC Input voltage.
