Honeywell 900U02-0100 - Table 37 - Controller Module Replacement

Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 213
May 2019
Replacing the Controller Module
Removing and replacing the Controller Module requires that that the source of AC power is removed
from the rack. Removing power from the Controller rack has the following consequences:
 All control action stops
 All power to all I/O modules in the rack is lost; hence all control outputs to the process are lost.
Because external power connected to terminal boards (from or to field devices) will still be
present, it is essential that field devices are maintained in a safe condition during replacement
procedures.
 Control to all I/O expansion racks is lost. If power is available to the expansion racks, outputs
go to configured Failsafe values.
C75 module
 Does not impact the other C75 CPU module, which will continue to control the process
 Contains start-up diagnostics after replacement to verify proper operation
 If there is a Lead Controller, the configuration database is automatically copied from the Lead
to the newly replaced C75 CPU module.
Before replacement:
 (If possible), upload and SAVE a copy of the configuration, or ensure that a previously saved
copy of the current configuration is available.
 (If possible), bring the process to a safe and orderly shutdown.
Table 37 – Controller Module Replacement
Step
Action
1.
If a process is currently in operation, bring it to a safe and orderly shutdown.
2.
Using an external (user-supplied) switch, disconnect the power supply in the Controller rack from
the site AC power source.
3.
Observe where communications cables are plugged into the Controller Module, and if necessary,
tag them to identify their functions. Unplug all communications cables.
4.
At the top and bottom of the module, loosen the captured screws that secure the module in the rack,
and remove the Controller Module from the rack.
5.
Ensure that you set the S1, S2, and RS-485 terminal dip switches as applicable.
6.
Ensure that the new Controller Module is properly aligned with the slot guides, insert the new
Controller Module in the rack, and secure it in place with the captured screws at top and bottom of
the module.
7.
Re-install communications cables.
8.
Using the (user-supplied) switch, re-connect site AC power to the rack.
9.
If using the Ethernet port for configuration, use the Designer software to set the proper network
address.
10.
Download the configuration.
11.
Set the Real-Time Clock.
12.
If all status indications are green, power may be restored to the I/O modules per the application's
procedures.