Honeywell HPM, Service

Page: 430 / 498

6 Removal and Replacement
6.14 Power Supply Module Replacement
430 HPM High-Performance Process Manager Service R688
Honeywell December 2020
6.14 Power Supply Module Replacement
Introduction
Provided the optional redundant Power Supply Module is installed, the HPM will remain in operation
while replacing a Power Supply Module. Be sure to notify Plant Operations that you will cause alarms
during the replacement process.
SHOCK HAZARD
Troubleshooting, opening this equipment and removing any panels or covers will expose the
user to the risk of a shock hazard. There are no user serviceable parts inside this equipment.
Refer all servicing only to qualified service personnel .
CAUTION
If the system is operational, do not remove both Power Supply Modules at the same time .
The batteries will not power the system unless at least one Power Supply Module is present.
If one of the Power Supply Modules fails, the batteries will not be drained.
ATTENTION
If the primary (left side) Power Supply Module is removed from the system or turned off, the 6
Vac is not provided to the card files because the redundant Power Supply Module does not
provide 6 Vac. This can cause a Soft Failure Alarm Notification for any LLAI card that is
present.
Replacement procedure
Use the procedure in the following table to replace a Power Supply Module. The procedure assumes that
redundant Power Supply Modules are in use.
Step Action
1
If the Power Supply Modules have ac present ( AC In LED on), the BATTERY switch
can be placed in the OFF position. Place the BATTERY switch in the OFF position
before removing the Power Supply Module. Set the recessed toggle switch on one, and
only one, Power Supply Module in the down (
OFF ) position. Remove two screws at the
bottom of the module that hold it to the shelf of the Power System chassis.
2
Pull the Power Supply Module straight out of the housing.
3
Before installing the replacement Power Supply Module, be sure the recessed toggle
switch is in the
OFF position.
4
Carefully slide the replacement module into the Power System chassis. Don't slam it
into its housing. Be careful and be sure that the contacts at the back of the module
mate properly with the fixed contacts at the back of the Power System backpanel.
5
Secure the replacement module with two screws at the bottom of the module, then set
the recessed toggle switch to the
ON position. Check that the green indicators on the
supply are operating satisfactorily and that alarms can be reset.
6
Place the BATTERY switch in the ON position.