Fault Finding And Replacement Procedures; System Fault Finding Procedures - Rectifier RT9- 24V Installation, Operation And Technical Manual

Installation, Operation and Technical Manual

9. Fault Finding and Replacement Procedures

This section describes in some detail the possible causes for alarms that may occur from
time to time and the procedures that should be followed to clear the alarms and more
importantly, address the problem or cause of the alarm.
It is assumed here that the most that a field maintenance person will do is change a
complete module. It is normally impractical to attempt to repair a particular unit without
test equipment, which is normally only available in the manufacturer's service laboratory.
The recommendation is for spare complete units to be kept on site. This includes a
complete SMR, a MCSU-4 unit, and a MUIB sub-assembly. The fault finding procedures
are presented below.

9.1 System Fault Finding Procedures

The following table outlines suggested procedures to be followed if it is assumed that no
internal repairs of units will be attempted. It is assumed instead that only MCSU-4
adjustments and unit replacement will be performed.
Alarm Condition
UNIT OFF
Equalise Mode
SMR Urgent
SMR Alarm
AC Fail (SMR alarm)
Cct Breaker
Battery Switch
Amb Temp High
158-1872-01
Possible Cause
No AC power to SMR
SMR faulty
Equalisation cycle in progress due to
recent AC power failure, periodic or
manual initiation.
All SMRs off due to AC power failure
One or more SMRs off due to faults;
All SMRs off due to incorrect Inhibit
signal from MCSU-4
One or more SMRs in Current Limit
Any of the above or non critical problem
with one or more SMRs
Total AC power failure or AC voltage not
within operating limits
Fuse or CB within PDU has blown or
tripped
Wire or connector loose on MUIB
Any one of 2 battery switches is open
Bad connection to MUIB
Ambient Temperature is too high
Temperature sensor is faulty
Connection to MUIB is faulty
Set point is too low
Action Suggested
Check AC supply to SMR; if necessary
reset CB supplying SMR
Replace SMR
No action required
If possible restore AC power
Check Individual SMRs for obvious
problem; replace SMRs if necessary
Replace MCSU-4
Check Current Limit settings and adjust if
necessary; or batteries being recharged
Select SMR menu. Check status of
SMRs which are flashing alarm LED.
Check AC supply and confirm condition;
If AC is OK replace SMR units if only two
show alarm condition
Check PDU (Power Distribution Unit)
Check MUIB connections and tighten
Close if appropriate
Repair connection
Reduce temperature – check Air Con.
Check and replace if necessary
Repair connection
Check Amb Temp High threshold level
and re-adjust if necessary
78
Rectifier Technologies
19-Feb-14