User's Manual
TRAIN CHIEF® II LRCS w/Lightweight OCU OWNER’S MANUAL
95-00-0-xxx Rev 000 3-7 Control Chief Corporation
The Receiver / Controller Unit (RCU)
The RCU consists of the control electronic and pneumatic components. The electronic
components consist of the programmable logic controller (the SLC 500™ PLC) with various I/O
and specialty modules, the transfer switch and various DC relays. The pneumatic components
consist of proportional air control valves, solenoid ON/OFF valves, pressure switches, pressure
transducers and pressure regulators, all mounted on specifically designed manifolds. The RCU
is mounted inside the locomotive cab on a dedicated rail system (Unistrut). The RCU is then
interfaced to the locomotive system(s) via cable wiring and DOT rated plastic tubing as per the
specific pneumatic and electrical requirements.
For more details on the configuration of your system please refer to your system drawing
package, specifically, drawing number E-9568-03-1 RECEIVER / CONTROLLER LAYOUT.
Figure 3-7: Typical RCU Layout
Transfer Switch, Intermediate Relays and DC Conditioning Module
The transfer switch is used to select between MANUAL and REMOTE operations. This switch
utilizes a switch-block arrangement that allows for various hardwired control functions.
The intermediate relays are used to control a number of auxiliary electrical devices such as
status lights, horn, sanding, and others depending on the locomotive requirements. The
intermediate relays may be located inside the enclosure or on the enclosure door. Refer to your
system prints for details specific to your system.
The DC conditioning module is used to condition the wheel slip and E-Stop inputs from 74VDC
down to 24VDC prior to going to the PLC input module. A DC-to-DC solid state isolated
voltage converter is provided to reduce the locomotive DC battery voltage to regulated 24VDC.
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