Menu Item Description
RTHC-SVD01B-EN 5
Section 2 Menu Item Description
2-1. General
UCP2 has several added features that are new to the Series R product
line. Some of those features are self-explanatory or were already dis-
cussed in the RTHC-IOM. Those will not be discussed below. Other
items are not self-explanatory, those items are discussed below.
2-2. Restart Inhibit Timer
High motor temperatures are avoided through using an embedded
simulation of the motor temperature based on an assumed amount of
heat added at start as well as cool down rates (heat dissipation) for
both running and stopped modes. This predicted temperature is then
utilized in establishing the restart inhibit time so that the motor does not
overheat.
The RTHC controls do not accommodate analog motor winding tem-
perature inputs.
The RI Timer shall be set based on a Background Timer (BT) that is
incremented by XX minutes (Value equal to the Motor Heating Con-
stant) at every start. UCP2 models the temperature continuously
including the effects of the energy or heat dissipated in the motor at
startup as well as the cooldown rates for both operating and nonoper-
ating modes. The BT is timed out on a basis of 1 second per second
while the chiller is running. When the chiller is not running, the back-
ground timer is decremented by 1 second every 5 seconds. The Back-
ground Timers current value is immediately stored nonvolatily upon
detection of imminent power loss and held until the reapplication of
power. Unlike the Restart Inhibit Timer, the Background Timer is not
resettable from any menu.
The Background Timer is incremented at compressor start by the
“Motor Heating Constant”, and is adjustable at the Human Interface in
the Machine Configuration Menu from 0 to 100 Minutes.
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