User manual

52 Maintenance
UM6C28C P0728920 Standard 11.00 April 2001 Emerson Energy Systems
Table 30 – Fault diagnosis ( continued )
Fault symptom Possible causes
On all models of control and distribution panels:
EQL lamp is lit The equalize mode is activated
RFA MIN lamp is lit One rectifier has failed
RFA MAJ lamp is lit Two or more rectifiers have failed
FA lamp is lit Blown fuse or tripped circuit breaker on the control
and distribution panel
LVD ALM lamp is lit Low voltage disconnect condition initiated by the
controller
LVD BYP lamp is lit The low voltage disconnect contactor has been
manually bypassed by means of the LVD
BYP/NORM switch.
Addition / replacement procedures
Replacing the RPM1000C
Refer to the maintenance chapter of the appropriate RPM1000C user
manual, listed in Appendix D for the procedure to replace the RPM1000C.
Replacing the NT6C14PF controller card ( NT6C14GA/GM and
NT6C14GP control and distribution panels only )
The NT6C14PF controller card can be easily replaced without taking the
NT6C28C(x) MFA150 power system out of service.
Proceed as described in Procedure 1.
CAUTION
Protect the equipment against an electro static discharge
( ESD )
The control card contains some discrete and
microelectronic solid state devices that can be
permanently damaged by electrostatic potentials that may
occur during handling and installation unless the
necessary precautions are taken.