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On/Off Function
Select Enable to allow the adjustment knob to power off the compressor and controller and to adjust the setpoint. Select Disabled to allow only setpoint
adjustment by the adjustment knob.
Potentiometer (Adjustment Knob)
These settings are unavailable if On/Off Function is disabled. Enter the Potentiometer Off Position to set the angle of the adjustment knob, relative to full
counter clockwise, that powers off the controller and compressor. Enter the Potentiometer On Position to set the angle of the adjustment knob, relative to full
counter clockwise, that powers on the controller.
6.2.5.2 Setpoints
Use the Setpoints tab to specify the controller setpoints - refrigeration Cut-In and Cut-Out values during normal operation.
NOTE: To define a fixed non-adjustable setpoint, configure the Cut-In Warm setpoint equal to the Cut-In Cold setpoint. Configure the Cut-Out Warm setpoint
equal to the Cut-Out Cold setpoint. Refer to the Fixed Setpoint graph in section 5.1.2.
Cut-In Warm
Specify the setpoint that causes the compressor to power on when the adjustment knob is set to the warm position (counter clockwise).
Cut-Out Warm
Specify the setpoint that causes the compressor to power off when the adjustment knob is set to the warm position (counter clockwise).
Cut-In Cold
Specify the setpoint that causes the compressor to power on when the adjustment knob is set to the cold position (clockwise).
Cut-Out Cold
Specify the setpoint that causes the compressor to power off when the adjustment knob is set to the cold position (clockwise).
Cut-in and cut-out setpoints for positions between warm and cold are calculated as linear interpolations from the configured cold and warm setpoints.
NOTE: If the On/Off Function is enabled on the Configuration tab, the Potentiometer On Position specifies the adjustment knob angle that selects the warm
setpoint.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
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