FDEx2 INSTRUCTION MANUAL FDEx2 INSTRUCTION MANUAL
20 +44 (1753) 214 500 sollateksupport@sollatek.com 21
7. ALARMS & ERRORS
7.1 FREQUENCY MONITORING AND ERROR DETECTION
The FDEx2 dynamically measures the frequency of the mains supply and reacts accordingly. If the mains supply frequency is too
low or too high, the FDEx2 will then disconnect the compressor and indicate an error signal through the LEDs. The FDEx2 can
auto-recover once the frequency is within acceptable limits.
On
Mains power
Normal
frequency
35-75Hz
Intelligent time delay
High
frequency
>75Hz
Normal
frequency
35-75Hz
Low
frequency
<35Hz
Normal
frequency
35-75Hz
Compressor
Note: The above illustration assumes that the Mains voltage RMS value is good and there is cooling demand, hence the
compressor comes on after the intelligent time delay is over.
7.2 REGULATION PROBE (PROBE#1) ERROR DETECTION
The FDEx2 will report an error code through the LEDs indicating a sensor fault if it happens. Depending on customer preferences
the FDEx2 will either:
Scenario One: Detect the fault and disconnect the compressor until the problem is resolved and then the system resumes normal
operation.
Cut in
Average
Cut out
faulty
functioning
On
O
Temperature
reading
Probe
Compressor
Probe fault has
been detected.
Compressor
switches o
until the fault
is recovered.
Scenario Two: Detect the fault and cycle the compressor on and off for a pre-set time regardless of the cooler temperature. Once
the problem is resolved the system will resume normal operation.
Cut in
Average
Cut out
faulty
functioning
On
O
Temperature
reading
Probe
Compressor
Probe fault has been detected.
Compressor cycles on and o
On
period
O
period
7.3 DEFROST PROBE (PROBE#2) ERROR DETECTION - EMERGENCY DEFROST MODE
If the defrost probe is faulty, the FDEx2 will enter emergency defrost mode (if enabled). In emergency defrost mode, the FDEx2
will ignore set defrost parameters and enter a state of continuous defrost cycling based on set parameters.
For example: The emergency defrost start time is set to 1 hour and the emergency defrost end time is set to 20 minutes.
After an hour after a defrost probe fault has been detected, the FDEx2 will enter defrost for 20 minutes before resuming normal
operation for 1 hour and so on until the probe fault has been fixed.
Cut in
Average
Cut out
faulty
On
O
Temperature
reading
Probe
Compressor
Probe fault has been detected.
Emergency Defrost Start Time -
Normal operation
Defrost
Period
Emergency Defrost Start Time -
Normal operation
7.4 INTERNAL FAULT DETECTION
If an internal fault within the FDEx2 is detected, it is reported through the LED indicator. If the fault does not automatically clear
and resumes normal operation, then please contact Sollatek for help and advice.
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