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Maintenance 51
Table 30 – Fault diagnosis ( continued )
Fault symptom
Failure to generate an
RFA alarm under
appropriate conditions
Rectifiers are not sharing
the load
Possible causes
Faulty rectifier
Faulty wiring
Faulty RFA MIN or RFA MAJ LED
Incorrect float or equalize adjustment on one or
more of the rectifiers
Sense leads are open on one or more rectifiers
Share mode incorrectly set on one or more
rectifiers
LVD contactor does not
Incorrect LVR or LVDR threshold setting
reconnect the load
Faulty controller card or RPM1000C
Blown F1 fuse on the controller
(NT6C14GA/GB/GM and NT6C14GE/GF/GP) or
LVD (NT6C14GC/GD/GN and
NT6C14GG/GH/GQ) card
Faulty contactor
On NT6C14GA/GM and NT6C14GP control and distribution panels only:
LV ALM lamp is lit
Low discharge voltage condition
Incorrect LV level adjustment
TST BYPASS lamp is lit
The NORMAL/BYPASS switch is in the BYPASS
position on the controller card.
On NT6C14GC/GN control and distribution panels only:
UNIT lamp is lit red
Failure of the RPM1000C
UNIT lamp is flashing
Low voltage on the memory back-up battery of the
RPM1000C
AC lamp is lit
AC supply for the rectifiers has failed.
FLOAT lamp is lit yellow
Slightly high or low discharge voltage condition
Incorrect HF or LF level adjustment
Incorrect float or equalize level adjustment on
one or more rectifiers
FLOAT lamp is lit red
High or low discharge voltage condition
Incorrect HV or LV level adjustment
Incorrect float or equalize level adjustment on
one or more rectifiers
BOD lamp is lit
Low discharge voltage condition
Incorrect BOD level adjustment
Incorrect float or equalize level adjustment on
one or more rectifiers
HVSD lamp is lit
A high voltage shutdown signal was sent to the
rectifiers by the RPM1000C
Incorrect HVSD level adjustment
FAN lamp lit
Fan failure on one or more rectifiers
AUX lamp lit
Auxiliary equipment failure (when programmed)
continued
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