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WFS 101545 Operations Manual
The indicating light above TEMP SET POINT displays the status of the chiller and whether
or not the system is calling for refrigeration. Actual cooling is only done when the Chiller
compressor is running.
TEMP DELTA (HYSTERISIS
) This prevents the compressor motor from rapid cycling or
“chattering”. This sets the hysteresis for the chiller operation. When the controller
senses that the recirculating water temperature is higher than the TEMP SET POINT the
cooling cycle will start. It will continue to cool the water until the temperature is below
the set point by the amount set on the TEMP DELTA. For example, if the TEMP SET
POINT is set for 70
o
F and the TEMP DELTA is set for 3
o
F the cooling cycle will start when
the water temperature reaches 70
o
F (after a predetermined internal delay). The cooling
cycle will stop when the water temperature drops below 67
o
F (70-3).
The set point range is from 1
o
to 10
o
F. Factory default is 3
o
.
NOTE: There may be a delay before the cooling cycle stops even after the temperature
is below the TEMP DELTA
The Chiller compressor will run only if the following conditions are met.
Recirculating Pump (PUMP 1) is running
Spindle Water Pump (PUMP 3) is running
CHILLER is enabled or ON.
The water temperature is above the set point or the Chiller has been running and
has not reached TEMPERATURE DELTA (HYSTERISIS) set point.
Internal time delays have been satisfied
iv.
Status
The STATUS page can be accessed from any other page simply by touching the STATUS
button at the bottom of the current page. See Figure 5-7
The STATUS page was designed to provide a quick overview of the WFS system status.
The page provides a digital and analog display of the following parameters:
SPINDLE FLOW (GPM)
SPINDLE WATER TEMP (
o
F)
PROCESS FLOW RATE (GPM)
PROCESS PUMP PRESSURE (PSI)
RECIRCULATING WATER TEMPERATURE (
o
F)
RECIRCULATING PUMP PRESSURE (PSI)
