User Manual

TRAIN CHIEF® II LRCS W/ Lightweight OCU-BT – OPERATORS MANUAL
95-00-0-062, Rev 08 3-7 Control Chief Corporation
3.3 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 valves, solenoids valves, pressure
switches, and pressure regulator, 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 tubing as per
the specific pneumatic and electrical requirements.
Controls depicted here are only one example of a typical arrangement. For details on the
specific configuration of your particular system please refer to your system drawing
package, specifically, drawing number E-XXXX-03-1 RECEIVER / CONTROLLER
LAYOUT. (Note: XXXX=system serial number.)
Figure 3-4: Typical RCU Layout
3.3.1 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 input down to 24VDC prior
to going to the PLC input module. A DC-to-DC solid state, isolated, voltage converter is
provided to regulate the locomotive DC to 24VDC.