56
CMC TECHNICAL REFERENCE MANUAL
1X36003 Version 2.52
1996-1999 Ingersoll-Rand Company
Date of Issue: 18-Oct-1999
Checking proper operation of the BCM and wiring
TMS #4
1. Ensure control power is off. At the affected RTD transmitter, disconnect the wires at
transmitter terminal #1 and #2. Connect a 4-20mA source to these terminals (Observe
correct polarity). Power up the control panel and then vary the simulator output.
2. At 12 mA (50%) the OUI should read 1/2 the RTD transmitter range; 100 or 250°F (37.7
or 121.1°C). The readout should change as the simulator output is varied.
3. If the reading on the OUI is incorrect or does not change, turn control power off and
reconnect the 4 to 20 mA simulator at the respective terminals at connector J1, (see
electrical schematic for connection points).
4. Turn control power on and observe the OUI readout while varying the 4-20mA. If the
reading is correct there is an open or short in the wire or terminals connecting the CMC
to the RTD transmitter. If reading is not correct the BCM may be faulty.
J2
-Floating Analog Inputs, (4-20mA) Channels 1-2
J1-
Grounded Analog Inputs,
(4-20mA) Channels 3-23
Pin 1
Pin 25
mA OUT
2 WIRE
OFF
100%
00.0%
DIAL
BATTERY
CHECK
LOOP
ON
XXXXXX
MODEL CL-XXX
00.0% - 100%
5
5
5
4-20 mA SURCE OR
2 WIRE SIMULATOR
BCM
