CVHE-SB-32A 6
UCP2 Control Panel
and Module Description
Chiller Module
The Chiller module is the Master-of-the-Chiller communicating commands to other modules and
collecting data/status/diagnostic information from other modules over the IPC (Interprocessor
Communications Link). The Chiller module performs the leaving chilled water temperature and
limit control algorithms arbitrating capacity against any operating limit the chiller may find itself
working against. The Chiller module checks for valid setpoints and contains non-volatile memory
(NOVRAM), to retain them on any power loss. Inputs and Outputs are chilled water system level
such as, but not limited to, evaporator and condenser water temperatures, evaporator and
condenser water pump control, status and alarm relays, and external auto/stop.
Circuit Module
The Circuit module serves as an input/output expander and is assigned inputs and outputs
associated with the refrigerant and lubrication circuits. The Circuit module also receives a 4-
2OmA signal from an external refrigerant monitor and converts the signal to ppm for display at
the Clear Language Display.
Module Setpoints relating to the circuit module.
1. condenser refrigerant pressure output: (J7 1,2) 2-10 VDC; 2 V = 0 psia (14.7 psig); 10 V =
14.7 psia (29.7 psig)
2. Refrigerant monitor input. (J5 5,6) 4-20 mA input suitable for factory or field connection. 4-
20 mA range is 0 to 100 ppm.
Stepper Module
The Stepper module is designed to drive the stepper motor inlet guide vane actuator on
CenTraVac chillers. On CenTraVac chillers the Stepper module receives from the Chiller module
the direction and distance to drive the inlet guide vanes and then generates the appropriate
signals to operate the stepper motor. The Stepper module also has other I/O capabilities used to
support functions on the stepper module and/or just I/O expansion. These are Evap.
temperature, Cond. discharge, Bearing temperature and Cond. temperature.
Starter Module
The Starter module physically resides in the Compressor Motor Starter Panel providing control of
the starter when starting, running and stopping the motor. The Starter module provides interface
to and control of Y-Delta, X-Line, P-Reactor, A-Transformers, Solid State Starters and Trane®
Adaptive Frequency Drive. The Starter module also provides protection to both the motor and the
compressor in the form of running overload, phase reversal, phase loss, phase unbalance,
momentary power loss, and compressor surge, in addition to others.
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