Filter
Top Products
Repair
Servicing the
Control Box
Replacing the Isolation Board
NOTICE
To avoid damaging the circuit boards when
servicing the control box, wear Part No. 112190
grounding strap on your wrist and ground
appropriately.
To avoid electrical component damage, remove all
system power before plugging any connectors.
1. Follow the steps in Before Servicing, page 34.
2. Loosen the screws (124) and remove the
enclosure cover (117).
3. Note the position of the isolation
board cables. See the following table,
Electrical Schematics, page 27, and Figure 24.
Disconnect the cables from the isolation board
(111). Remove the brackets (110).
Isolation Board
Connector
Cable Destination
J1 (non-intrinsically
safe)
Gateway Module
J2 (non-intrinsically
safe)
Optional Non-IS Color
Change Module
J3 (intrinsically safe)
Barrier Board
J4 (intrinsically safe) Optional IS Color
Change Module
To reduce the risk of fire or explosion, be
certain that the barrier board is connected to
J3, on the IS side of the isolation board. If
connected incorrectly, the intrinsic safety of
your system is compromised.
4. Remove the screws (128) holding the isolation
board (111) to the barrier cover (107). Remove
the isolation board.
5. Install the new isolation board, using the screws
(128).
6. Install the brackets (110). Reconnect the cables
to the positions as noted above.
7. Turn on power at the main circuit breaker.
8. Turn on the control box power switch. Check
that the two green LEDs (D7, D8) and two yellow
LEDs (D6, D14) are on. See Figure 24.
9. Reinstall the cover (117) and tighten the screws
(124).
Figure 23 Replacing the Isolation Board
38 332709B