User's Manual

TRAIN CHIEF® II LRCS w/Lightweight OCU OWNER’S MANUAL
95-00-0-xxx Rev 000 3-8 Control Chief Corporation
Programmable Logic Controller - SLC 500™System
The SLC 500™ is the control center for the Train Chief® II system. The SLC 500™ incorporates
the necessary I/O modules to control the various locomotive interfaces based on a ladder logic
program, specifically, developed for locomotive remote control and tuned for your particular
application.
1746-P3 POWER SUPPLY
Allen-Bradley SLC 500™ power supply modules include a LED that illuminates when the
power supply is functioning properly. Power supplies are designed to withstand a brief
power loss (brown-out) for a period of between 0.02 to 3 seconds, depending upon loading
conditions. The P3 fuse is accessible by opening the module’s front panel located to the
upper left of the input terminal block. A replacement fuse can be obtained from your local AB
distributor or through Control Chief Customer Service.
CHASSIS
The chassis houses the P3 power supply, processor, and all the I/O modules. All
components slide easily into the chassis along guides formed into the chassis. No tools are
required to insert or remove the processor or I/O modules. The power supply and removable
terminal strips on the I/O modules do require a philips screwdriver for removal and
installation.
SLC 500™ PROCESSOR
The SLC 500™ processor utilized in the Train Chief® II system contains the primary control
program. The processor is programmed using ladder logic which is uniquely suited for
control applications. For troubleshooting purposes the processor provides several LED
indicators; RUN, FAULT, and BATT (other modules will have additional indicators, but the
ones listed are the most important).
MEMORY MODULE
The memory module is a plug-in to the processor module and provides non-volatile and
secure program storage for the specific ladder program for your particular application.
ANALOG MODULE(S)
The analog modules incorporate high-resolution providing for precision control of analog
outputs, which are typically used to control the proportional pneumatic valves for locomotive
brake, trainline brakes, and where applicable, pneumatically controlled locomotive throttle.
The modules also incorporate high resolution inputs to precisely monitor the controlled
pressures. The modules feature input filtering providing high immunity to electrical noise.
OUTPUT MODULE(S)
The output module(s) provide the means with which to actuate the various functions on the
locomotive system. Typical functions controlled by the output modules include; generator
field, reverser directional selection, sand, horn, bell, throttle position, and indicator
lights/strobe. Intermediate relays are used (located in the locomotive interface panel) where
a control function current rating may exceed the rating of an output module. All output
modules provide LED indicators for each output point. The LED’s illuminate when the
processor applies power to an output terminal.