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+24 VDC Power System User Manual (Section 6013)
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Rev. G
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Replacement Information
Replacement Assemblies
When a trouble symptom is localized to a faulty Rectifier Module or circuit card, that particular Rectifier Module
or circuit card should be replaced in its entirety. Other than a Rectifier Module fan replacement, no attempt
should be made to troubleshoot or repair individual components on any Rectifier Module or circuit card.
Refer to SAG581126000 (System Application Guide) for replacement part numbers. The SAG can be accessed
from the CD (Electronic Documentation Package) furnished with your system.
Replacement Cables
Refer to SAG581126000 (System Application Guide) for replacement part numbers. The SAG can be accessed
from the CD (Electronic Documentation Package) furnished with your system.
Replacement Procedures
Replacing a Rectifier Module (PCU)
Refer to the Rectifier User Instructions (UM1R243000) for a Rectifier Module replacement procedure. Before
replacing any Rectifier Module, note the following.
NOTE!
If a Rectifier Module (PCU) is removed without being replaced, perform the UPDATE
INVENTORY procedure found in this section under TROUBLESHOOTING INFORMATION to clear
alarms.
If a Rectifier Module (PCU) is removed and replaced with a different module, alarms are activated for 2
minutes after inserting the new Rectifier Module. The MCA automatically removes the old Rectifier
Module from inventory and adds the new Rectifier Module to the inventory. Refer to the following note
for further explanation.
NOTE!
The "REPLACE ## PCUs" message is automatically displayed when a new Rectifier Module
(PCU) is detected and a PCU no reply alarm is active, or becomes active within two minutes. The
message is displayed for 2 minutes and the message timer is restarted every time a new Rectifier
Module (PCU) is detected or a new PCU no reply alarm becomes active.
The timer is terminated and the ALM ## PCUs FAIL message is displayed if the NO (-) pushbutton is
pressed.
Rectifier Modules (PCUs) equal to the number of new Rectifier Modules (PCUs) or the number of PCU
no reply alarms, whichever is less, are removed from the inventory if the YES (+) pushbutton is pressed
or if the timer expires without a pushbutton being pressed. The MCA displays the PLEASE WAIT
message while it updates the Rectifier Modules (PCUs) in its permanent inventory, and then displays the
CURRLIM = #####A message.
Replacing a Converter Module
Refer to the Converter User Instructions (UM1C24481500) for a Converter Module replacement procedure.
MCA Replacement
The MCA includes three separate circuit cards: the MCA Main Controller, the MCA Power Supply, and the MCA
Keypad/Display. The MCA is removed from the Distribution Cabinet as a complete assembly prior to replacing
any of these circuit cards. A procedure for removing the MCA assembly for service is provided here.
Procedures for replacing each of the circuit cards are also provided.