Ranco EcoCool E72R - 5.1.7 Sensor Failure Mode

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5.1.6 Display
The optional display has two digits, a negative sign, and three status LEDs. It displays the range -99 to 99 and the characters dF. Normally the display shows
the control sensor temperature. The display shows the selected cut-out setpoint during adjustment and for three seconds after the adjustment is made.
Sensor faults, temperature alarms, compressor or solenoid valve operation, and defrost are indicated by the display LEDs as they are by the controller LEDs.
5.1.7 Sensor failure mode
If a sensor circuit becomes shorted or open, the Sensor Fault Monitoring Time timer begins counting down. If the timer expires before the fault is
corrected, the controller issues an alarm (refer to 5.1.5 for display indication) and uses the configured Sensor Failure Mode to power off, power on, or duty
cycle the compressor. The compressor on time and compressor off time of the duty cycle can be configured. When fault is fixed, the timer resets and the
alarm is cancelled.
Duty Cycle
Type E7 EcoCool™ Electronic Temperature and Defrost Controllers
©2008 Invensys Controls All rights reserved.
DRAFT VERSION
ED1
Defrost Cycle
Temperature or
Sensor Alarm
Compressor
Powered On
On
Off
Compressor or
Refrigeration
Status
Time
Compressor
Off Time If
sensor Failed
Compressor
On Time If
sensor Failed
Off
On
Off
On
Sensor Failure
Protection