ClimaCool CoolLogic Control System - Manual (Page 4)

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4
Field Connections between Master Control Panel
and Module Controller
• 18 AWG, two conductor shielded cable (under
50 feet).
• Over 50 feet, contact factory
Note: Use the same polarity throughout the network segment
Field Connections to the Master Control Panel
Field integration with the stand-alone Master Control
Panel is simplifi ed by the use of the following minimum
input devices:
• A remote start/stop input for scheduling is required for
unit operation
• Diff erential pressure fl ow sensors/switches for both
chilled and condenser water fl ows are required for unit
operation
• Voltage/phase monitor (phase loss/phase reversal,
brown-out/black-out device) is required for unit
operation
• Chilled water inlet and outlet temperature sensors
and wells
• Condenser water inlet and outlet temperature sensors
and wells
Field integration of the following output devices is standard:
• Alarm output closes when any active latching alarm
condition occurs (parameter or compressor fault)
• Chiller status output is closed whenever there is a call
for chiller operation, and all fl ow, limit, phase, and
interlock inputs deliver a closure signal indicating a
present normal condition to allow for chiller operation
Field Connections to the Modules
The Master Control Panel connects to the modules
using the embedded ARC156 networking technology. It
is well suited for real-time control applications in both
the industrial and commercial marketplaces. ARC156
is a unique implementation of ARCnet but is similar
to master module/token passing (MS/TP). Speed is the main
diff erence. ARC156 baud rate is 156K whereas MS/TP utilizes a
maximum at 76.8K. ARC156 uses a separate communications
co-processor to handle the network traffi c and another
processor to manage the program execution.
Module Controller
The module controller directly senses the control
parameters that govern the specifi c module’s operation,
such as evaporator and condenser entering and leaving
temperatures, both compressors’ winding temperatures,
suction and discharge temperatures and pressures.