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Low Temperature Alarm – Warm Position
Specifies the sensed low temperature setpoint that causes an alarm when the adjustment knob is in the warm position. Control sensor temperatures equal
to or less than this threshold cause an alarm when the adjustment knob is in the warm position.
High Temperature Alarm – Cold Position
Specifies the sensed high temperature setpoint that causes an alarm when the adjustment knob is in the cold position. Control sensor temperatures equal to
or greater than this threshold cause an alarm when the adjustment knob is in the cold position.
Low Temperature Alarm – Cold Position
Specifies the sensed low temperature setpoint that causes an alarm when the adjustment knob is in the cold position. Control sensor temperatures equal to
or less than this threshold cause an alarm when the adjustment knob is in the cold position.
If the user selects a control setpoint between the warm and cold positions, the alarm thresholds are calculated by the controller as linear interpolations from
the temperature
alarm setpoints.
Temperature Alarm Differential
Specifies the amount of temperature correction required to cancel a temperature alarm. A high temperature alarm is cancelled when the temperature is less
than the alarm threshold minus the differential. A low temperature alarm is cancelled when the temperature is greater than the low temperature alarm
threshold plus the differential.
Temperature Alarm Time Delay
Specifies the minimum time that a sensed control temperature must be beyond a temperature alarm threshold before a temperature alarm occurs.
Temperature Alarm Disable Time after Start up
Specifies how long temperature alarms are disabled after the controller is powered on.
Temperature Alarm Delay After Defrost
Specifies the maximum time delay before an alarm is activated when the control temperature is beyond an alarm threshold after defrost is terminated by
time or temperature or after drip time has ended - if used.
6.2.5.5 Compressor
Use the Compressor tab to set compressor protection delays for the minimum power on and power off periods for the compressor. These minimum time
periods can be used to protect the compressor against short cycling.
NOTE: Although the Compressor Minimum Off Time can be set as short as zero seconds, time should be provided to protect the compressor against short-cycling.
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
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