Railway Equipment 934, Operating Manual

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P/N R9340-0104 17 © 2010 RAILWAY EQUIPMENT CO.
REV B
5/11
IV. CONTROL MODULE
A. DESCRIPTION
The hot air blower control module contains all of the elements and functions
necessary for advanced snow melter operation. The unique single-chip
microcomputer has been programmed with logic and timing sequences to provide
complete heater control as well as operational control and system interface. Some
of the many features included in the control module are:
Auto-Off-Force
selector switch
Adjustable air temperature setting
Built-in snow detector (Requires Optional Snow Detector Head)
Adjustable start-up delay sequence
Adjustable run timer for timed or continuous operation
Adjustable snow detect timer for use with optional snow detector
Operator control and indication
Remote fault reset
Audible tone before blower start-up
Input/output status indication lights:
Inputs:
Air
temperature
Remote Control
Moisture Detector One or two snow detector(s) (Optional)
Airflow switch
Outputs:
Blower motor
Heater contactor
Indication
Fail
B. MODULE CONTROLS AND INDICATORS
CONTROLS
1. AUTO/OFF/FORCE SWITCH (SS1)
a) AUTO:
This position will allow operation by placing a circuit closure across
terminal posts 1 and 2. It will also allow operation by an optional
snow detector.
b) OFF: If off, GHAB cannot be run from remote or snow detector.