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Appendix E
for this set of mounting holes is approximately 7.48" x 4.72" (190mm x
120mm). These mounting holes should only be used in dry, interior loca-
tions as the mounting screws directly penetrate the enclosure wall.
E-2.3
Enclosure Disassembly/Assembly
Disassembly of the ADFM Analog Output Module for access to the mount-
ing holes on the back of the enclosure, or for component replacement, is
accomplished using the following sequence. Re-assembly of the module
follows the same sequence in reverse order.
a. Remove the front cover.
b. Disconnect all power sources from the module.
c. Remove the LCD mounting plate and disconnect the LCD wiring
harness.
d. Remove the DGH module(s).
e. The circuit board is held in position by six (6) nylon standoffs.
Carefully depress the detent on each stand off and lift the circuit
board slightly. When all six standoffs are freed, the circuit board
can be lifted free of the standoffs.
f. Disconnect field wiring as required. It may also be necessary to dis-
connect the external communications connector, J1, and the ADFM
communications cable.
g. Remove the six (6) screws securing the circuit board mounting
bracket to the enclosure.
E-2.4
Wiring Connections
Wiring connections to the ADFM Analog Output Module consist of the
ADFM communications cable and field wiring for the DC power supply,
analog current loop(s), and pulse output(s) if used. All wiring connections
to the module are made through two terminal blocks, TB1 and TB2. The
ADFM communications cable is wired to TB1 using the color coding
marked on the circuit board. Pin numbers, wire colors, and functions are as
follows:
Table E-1:
Pin #
Wire #-Color
1
1-Black
2
2-White
3
3-Red
4
4-Green
page E-4
Wiring Connections
TB1 pin
1
2
3
4
Function
RS-422, RX+
RS-422, RX-
RS-422, TX-
RS-422, TX+
MGD Technologies, Inc.
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