Emerson Process Management ControlWave XFC - Manual (Page 78)

3-2 / Service CI-ControlWave XFC
3.2.2 Removal/Replacement of the Function Module
1. If the ControlWave XFC is running, place any critical control processes under
manual control.
2. Remove the Rear/Wiring Cover and shut down the unit by disconnecting power at
the Terminal Plate (Terminal Block connector TB6)..
3. Unplug Terminal Block communication cable connector J2, RTD connector J3 and
I/O wiring connectors J4 and J5. Push wires and plugs into the conduit so the Ter-
minal Plate can clear the Housing when the Function Module is removed.
4. Remove the four screws that secure the Function Module to the Case and carefully
remove the Function Module far enough to facilitate disconnection of the MVT Inter-
face cable from Connector P1 on the I/O Board. Disconnect the MVT Interface Cable
from connector P1 near the bottom of the I/O Board. Note: It may be helpful to re-
move the Rear/Window Housing Cover and use a free hand to help guide the MVT
Cable under the CPU Board. Remove the Function Module.
5. To replace the Function Module, you must first plug the MVT Interface Cable into
connector P1 near the bottom of the I/O Board. Then align the replacement Function
Module with the Case such that Terminal Plate connector J4 is positioned at the
bottom and insert the unit into the Case. Replace the four screws removed in step 4
and all cables removed in steps 3 and 2. Replace the Rear/Wiring Cover.
3.2.3 Removal/Replacement of the MVT or GPT Transducer
1. If the ControlWave XFC is running, place any critical control processes under
manual control.
2. Remove the Rear/Wiring Cover and shut down the unit by disconnecting power at
the Terminal Plate (Terminal Block connector TB6).Disconnect all I/O connections
(including RTD wiring) from the Terminal Plate. Remove the CW XFC from the
manifold and take it to a depot repair area that supports proper ESD control.
3. Disconnect the MVT/GPT Interface Cable from the I/O Board. This will require the
removal of the units Function Module (see steps 1 through 4 of Section 3.2.2).
4. Loosen the Allen Screw that secures the Multivariable (MVT) or Gage Pressure
Transducer (GPT) to the case and then unscrew and remove the MVT/GPT.
5. To install a replacement MVT, follow steps 4 through 1 in reverse order. Make sure
the MVT/GPT O-Ring Seal is in place and apply anti-seize compound as required.
When installing a MVT/GPT into the bottom of the Case (Housing), screw it in all
the way and then back-off (approximately one turn) and orient the Flange for the de-
sired High and Low settings.
3.2.4 Removal/Replacement of the Lithium RAM Battery
The ControlWave XFC’s Lithium RAM battery cannot be replaced while power is on. Once
the RAM battery has been replaced, the unit will still execute its FLASH-based application
load (Boot Project) upon power-up, but all of the current process data will have been lost.
Upon power-up, the unit will act as though it had just been booted and it will revert back to
the initial values specified in its application load. The battery may be disabled by remov-
ing/parking the CPU’s Battery Backup Jumper (JP1).
1. If the ControlWave XFC is running, place any critical control processes under
manual control.
2. Remove the Rear/Wiring Cover and shut down the unit by disconnecting power at
the Terminal Plate (Terminal Block connector TB6).