2 Controller RDC 2
At startup, the controller shows the time remaining until compressors starts by displaying COMP TIME
X MIN. The value X can be changed by changing the parameter no. 5.
After the countdown is finished, the controller RDC 2 shows the temperature of the dew point reached
by the refrigeration air dryer in the normal operation. By pressing the UP (▲) button, the outlet
temperature of the compressor is displayed. By pressing the DOWN (▼) button, the condensation
temperature is displayed (the temperature sensor is connected) or the condensation pressure is
displayed (the pressure sensor is connected). In case of fault, an alarm will appear on the display. The
alarm automatically turns off when the dryer is restarted and is operating properly.
a) Sensors used for regulation:
1) T
dew
= Dew point temperature
2) T
comp
= Compressor temperature
3) T
cond
ali p
cond
= Condensation temperature or pressure (4-20 mA)
b) Regulated components:
1) Fan (ON/OFF)
• Fan symbol is displayed when in ON state
2) Compressor (ON/OFF)
• Compressor symbol is displayed when in ON state
3) Drain (ON/OFF)
• Drain symbol is displayed when in ON state
c) Operation of fan and compressor
1) Normal operation:
• The compressor is always running
• The fan is regulated based on measured condensation temperature or pressure
• Dew point temperature is displayed.
2) Alarm operation
• In alarm state the normal operation is overridden.
• If more alarms are activated the last one activated has priority with display and
fan/compressor operation. All other active alarms have to be resolved before
continuing in normal operation.
• Alarm is displayed.
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