FDEx2 INSTRUCTION MANUAL FDEx2 INSTRUCTION MANUAL
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1.3 LED INDICATORS
On. Voltage Good. Cooling Demand.
Probe #1 Fault. Compressor Configurable.
Probe #2 Fault. Compressor Configurable.
Mains Frequency Out of Range.
Off. Voltage Bad. Cooling Demand.
Defrost Mode.
Wait Period. Cooling Demand.
Wait Period. No Cooling Demand.
Mains Voltage Compressor
Meaning
Within Under/Over Voltage Blind Time.
Solid ON
Flash fast every 2 secs
Flash fast twice every 2 secs
Flashing 0.1 sec ON / 0.1 sec OFF
Flashing 0.5 sec ON / 0.5 sec OFF
Flashing 4 secs ON / 4 secs OFF
Flashing 1 sec ON / 1 sec OFF
Flashing 2 secs ON / 2 secs OFF
Momentarily OFF
LED Description
Battery Charging when Powered by Mains.
Solid ON
OFF
Battery Fully Charged when Powered by Mains
Pre Defrost Mode.Flashing 4 sec ON / 1 sec OFF
Drip Down Mode.Flashing 4 sec ON / 1 sec OFF
Drip Down Recovery Mode.Flashing 4 sec ON / 2 sec OFF
KEY On/good Off/bad Not relevant
GSM Powered Down
OFF
OFF
Searching for Network
Flashing 64 msec ON
/ 800 msec OFF
ON
Idle - Connected with Network
Flashing 64 msec ON
/ 200 msec OFF
ON
Data Transer in Progress
Flashing 64 msec ON
/ 600 msec OFF
ON
FDEx2-2BBW FDEx2-4BBW
OFF
OFF
Flashing 200 msec ON
/ 1800 msec OFF
ON
Flashing 125 msec ON
/ 125 msec OFF
ON
Flashing 1800 msec ON
/ 200 msec OFF
ON
2. FUNCTION
2.1 TEMPERATURE CONTROL
The FDEx2 is a microprocessor-based temperature controller utilising up to two NTC (Negative Temperature Coefficient) probes.
The cooler temperature is determined by measuring the temperature of either the return airflow or evaporator temperature
depending on where the customer prefers to fit the probe. This probe should be connected to the probe #1 connector.
The FDEx2 is a closed-loop temperature controller, turning the compressor OFF once the Cut-out set point has been reached
and then turning the compressor ON when the Cut-in temperature is reached. Users can set both the cut-in and cut-out values.
2.2 ENERGY SAVING
Commercial refrigeration is energy-hungry; With rising energy costs and growing environmental concerns, the FDEx2 allows you
to reduce energy consumption. You can:
• Cycle the Evaporator Fan: set the fan to cycle during operation as opposed to ON all the time.
• Temperature Setback Mode: Reduce the cooling demand by increasing the set temperature values. This will reduce how
hard the compressor must work and therefore reduce energy.
The setback is designed to be initiated when the store is closed. To activate Setback there must be no door activity for a
configurable set period.
2.3 DEFROST CONTROL
One of the primary functions of the FDEx2 controller is defrost management. The defrost cycle can be initiated or terminated
by either time or temperature (active).
Every system is different but usually, for the most efficient and satisfactory refrigeration operation, you would set the controller
parameters to initiate the fewest amount of defrosts in a day, for the shortest amount of time needed to clear the evaporator of
ice.
Usually, parameters will be set to terminate due to temperature with a fail-safe time backup to prevent prolonged defrost because
of defective defrost components or failures.
The FDEx2 supports Natural or Forced Defrost:
• Natural Defrost turns off the compressor and allows the evaporator to warm up normally.
• Forced Defrost turns the compressor and evaporator fan off and then turns a reverse fan to warm up the evaporator quicker
than natural defrost.
Standard operation during Defrost:
Natural Defrost Forced Defrost
Compressor: OFF Compressor: OFF
Evaporator Fan: ON Evaporator Fan: OFF
Reverse Fan or Heater: ON
2.4 VOLTAGE AND COMPRESSOR PROTECTION
The FDEx2 has built-in voltage protection including High / low voltage, spikes/surges, and frequency monitoring to protect the
controller and connected outputs to reduce equipment damage and downtime. The FDEx2 continually senses the mains supply,
on sensing bad voltage (voltage is higher or lower than the present acceptable limits) the FDEx2 will disconnect the compressor
and other connected outputs. Once the voltage becomes good, the FDEx2 will ensure the voltage remains good for a set period
(TIMESAVE™) before reconnecting power to the compressor and other connected outputs.
A minimum OFF period is essential in allowing compressor gases to neutralise, ensuring that the mains have stabilised before
re-connection and avoiding a locked rotor condition, however, any prolonged off time can affect cooler efficiency and or the
contents of the cooler. The FDEx2 will automatically adjust the reconnection period meaning the cooler will never be off for
longer than required.
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