Instruction manual

ControlWave Gas Flow Computer (GFC Plus) Instruction Manual (CI-ControlWave GFC Plus)
5-6 Service & Troubleshooting Revised Feb-2013
5.2 Removing or Replacing Components
This section provides information on accessing ControlWave GFC Plus
components for testing, as well as removal/replacement procedures.
Caution
Field repairs to the ControlWave GFC Plus are strictly limited to the
replacement of complete modules. Replacing board components
constitutes tampering and violates the product warranty. Return
defective boards, LCD, MVT/GPT or housings to the factory for
authorized service.
5.2.1 Accessing Modules for Testing
Only technically qualified personnel should test and/or replace
ControlWave GFC Plus components. Read completely the disassembly
and test procedures described in this manual before starting. Any
damage to the ControlWave GFC Plus resulting from improper handling
or incorrect service procedures is not covered under the product
warranty agreement. If you cannot properly perform these procedures,
obtain authorization and then return the device to the factory for
evaluation and repairs.
5.2.2 Removing/Replacing the CPU/System Controller Board and
the Process I/O Board
Use this procedure to remove or replace the CPU/System Controller
board and the Process I/O board.
1. If the ControlWave GFC Plus is running, place any critical
control processes under manual control.
2. Open the cover and shut down the ControlWave GFC Plus by
disconnecting the power at the CPU/System Controller assembly
terminal TB1 (and if applicable, TB2).
3. Disconnect all removable card edge connectors from the
CPU/System Controller board and the Process I/O board. Label
or otherwise identify them so you can easily re-connect them
later.
4. If present, disconnect the display/keypad from connector J2 on
the CPU/System Controller board.
5. Loosen the upper and lower locking tabs and rotate them so you
can remove the boards together. Carefully slide the boards
toward the front of the unit and unplug the MVT cable from the
CPU/System Controller board connector P1.
6. If you need to replace either the CPU/System Controller board
or Process I/O board, you need to separate the two boards. Use a
pair of needle-nosed pliers to squeeze the pair of tabs associated
with each of the six nylon mounting posts, while gently pulling
the CPU/System Controller board away from the Process I/O