User's Manual

TRAIN CHIEF® II LRCS w/Lightweight OCU OWNER’S MANUAL
95-00-0-xxx Rev 000 7-11 Control Chief Corporation
Main Reservoir
If main air supply goes low (below 75-psi) the low main air AMBER light will illuminate on the
receiver / controller cabinet. To clear this alarm condition the main reservoir must be restored to
105-psi. Once the main reservoir is at 105-psi or greater the system can be reset. Main air
reservoir pressure can be verified on the PLC module in slot #1, input #0 (I; 1.0). (4 mA = 0-psi,
20 mA = 150-psi)
Independent Brake (Proportional regulator check)
Using the voltmeter on VDC, check the voltage on I: 1.1
NOTE 1
. This is the actual output of the
proportional regulator. You should have approximately 5.5 VDC with the brake set. Releasing
the brake should give you approximately 0 VDC. (0 VDC = 0-psi, 10 VDC = 150-psi). Ground
should be referenced to the 24VDC-COM when taking voltage readings on the analog cards.
For the 4-20 mA output to the proportional valves, the voltmeter must be set on amps-DC and
the measurement is made at the analog output (0: 1.0). All current measurements must be
made in series. In order to do a series measurement, the output wire must be disconnected
from the PLC output, so that one meter lead can be hooked to the wire and the other lead to the
PLC module output. The current being measured must flow through the meter. You should
have approximately 12-13 mA with the brake set. Releasing the brake should give you
approximately 4 mA. (4 mA = 0-psi, 20 mA = 150-psi).
Pneumatic Throttle (when present)
Take voltage reading at I: 2.0
NOTE 1
in the same manner as with the independent brake. This
reading is the actual output of the throttle proportional regulator. (0VDC = 0-psi, 10VDC =150-
psi).
Take current reading at O: 2.0 in the same manner as with the independent brake. This reading
is the output to the throttle proportional valve. (4 mA = 0-psi, 20 mA = 150-psi)
Automatic (Trainline) Brake
Take voltage reading at I: 2.1
NOTE 1
in the same manner as with the independent brake. This
reading is the actual output of the trainline proportional regulator. (0VDC = 0-psi, 10VDC =150-
psi).
Take current reading at O: 2.1 in the same manner as with the independent brake. This reading
is the output to the trainline proportional valve. (4 mA = 0-psi, 20 mA = 150-psi)
Electrical Outputs (Aux functions):
Use the control station to activate all electric functions and verify that the corresponding LED on
the output modules light while the output is active. Use the voltmeter to check voltage output for
each electric function. Refer to schematic designated for the module in question to get
reference voltage.
NOTE 1: Some systems use pressure transmitters for feedback to the receiver system. In this
case, inputs at I: 1.1, I: 2.0, and I: 2.1 should be read using the “current method” where 4 mA = 0-
psi and 20 mA = 150-psi.