Emerson Process Management ControlWave XFC - Manual (Page 77)

CI-ControlWave XFC Service / 3-1
Section 3
SERVICE
3.1 SERVICE INTRODUCTION
This section provides general, diagnostic and test information for the ControlWave XFC.
The service procedures described herein will require the following equipment:
1. PC with null modem interface cable & Bristol’s WINDIAG Software
2. Loop-back wires (for RS-232 & RS-485) (see Figure 3-9)
The following test equipment can be used to test the Power Supply/Sequencer Module:
1. DMM (Digital Multimeter): 5-1/2 digit resolution
2. Variable DC Supply: Variable to 30Vdc @ 2.5A (with vernier adjustment)
When ControlWave XFC gas flow computers are serviced on site, it is recommended that
any associated processes be closed down or placed under manual control. This precaution
will prevent any processes from accidentally running out of control when tests are con-
ducted.
Warning
Harmful electrical potentials may still be present at the field wiring terminals
even though the ControlWave XFC’s power source may be turned off or dis-
connected. Do not attempt to unplug termination connectors or perform any
wiring operations until all the associated supply sources are turned off and/or
disconnected.
Warning
Always turn off the any external supply sources used for externally powered
I/O circuits, before changing any printed circuit boards.
3.2 COMPONENT REMOVAL/REPLACEMENT PROCEDURES
This section provides information on accessing ControlWave XFC components for testing,
as well as removal/replacement procedures. Note: While performing steps 3.2.1
through 3.2.4, observe proper grounding practices for the control of ESD (see
document S14006 at the end of this manual).
3.2.1 Accessing Components for Testing
Testing and replacement of ControlWave XFC components should only be performed by
technically qualified persons. Familiarity with disassembly and test procedures described
in this manual are required before starting. Any damage to the ControlWave XFC result-
ing from improper handling or incorrect service procedures will not be covered under the
product warranty agreement. If these procedures cannot be performed properly, the unit
should be returned to Bristol (with prior authorization from Bristol Babcock) for factory
evaluation and repairs.