Overview
2 RTHC-SVD01B-EN
If a module is requested to be returned, it is helpful to include with the
returned module a brief explanation of the problem, the unit serial
number, sales office, job name, and a contact person for possible fol-
low-up. The note should be slipped into the module enclosure. Early
and timely processing of field returns allows for immediate reaction by
our quality assurance department. Return the modules as specified by
the local parts department or Technical Service.
1-3. System Description
UCP2 control consists of a modular design partitioned by major func-
tions. All modules communicate with each other through the IPC (inter-
processor communication or twisted pair) link. Each microprocessor
based control module is described below.
1-3 a. 1U1 - UCM Chiller Module
The Chiller module is the main module, communicating commands to
other modules and collecting data/status/diagnostic information from
other modules over the IPC link. The Chiller module performs the leav-
ing chilled water temperature and limit control algorithms controlling
the load against any operating limits that occur. The 1U1 checks for
valid setpoints. The non-volatile memory (NOVRAM) allows UCP2 to
retain setpoints through a power loss and is contained in the 1U1 mod-
ule. Some of the inputs and outputs of the 1U1 are evaporator and
condenser water temperature, evaporator and condenser water pump
control, status and alarm relays, external auto/stop, and emergency
stop.
1-3 b. 1U2 - Starter Module
The Starter module controls the starter while starting, running and
stopping the compressor. The Starter module provides interface to,
and control of, the Y-Delta and Solid State Starters. The Starter mod-
ule also provides protection to both the compressor and motor through
running overload, phase reversal, phase loss, phase unbalance, start-
ing overload and momentary power loss diagnostics.
1-3 c. 1U3 - Stepper Module
The Stepper module is designed to drive the stepper motor on the
electronic expansion valve. It also receives the input from refrigerant
temperature sensors and the Liquid Level sensor.
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