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P O W E R I N G T E C H N O L O G Y
Manual No. MS0027-MAN rev. 4
guardian_access_3u_ms27-man-rev4-0817.indd
Fault
Possible Cause
Suggestion/Solution
Module Failure
Faulty module.
AC OFF on a single rectifier (if more
than one rectifier is installed).
Rectifier current sharing fault.
Low DC output voltage, overvoltage
shutdown, module fan failure, module
is overheated.
Check if module sends alarm flag.
Verify the AC voltage to the failed
module.
Re-insert the faulty module, wait for
30 seconds
Replace the faulty module.
Urgent Module
Failure
More than one rectifier is reporting
Module failure.
See Module failure alarm.
High Load
Faulty module .
Rectifier load current exceeds the set
High load limit [%].
Compare the load current with
installed rectifier capacity.
Add a rectifier or reduce load.
Verify the High load limit setting.
Replace the faulty module.
Overvoltage
Shutdown
Faulty module
Re-insert the module, wait for 5
minutes.
Replace the faulty module.
Load/Battery
Disconnection
System voltage drops below the set
limit.
System shutdown.
Check the battery condition.
Check the AC mains connection.
Check the input breaker.
Check the rectifier modules.
