STEUEREINHEIT AIRBASIC 2 –GEBRAUCHSANWEISUNGEN
AIRBASIC 2 CONTROLLER – USER MANUAL
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2.7. Controlling the compressor load/unload operation
• with pressure switch
When the compressor is in load operation, the LED ( / ) on the right hand side of the display lights steadily to
indicate that the compressor is running in load mode. When the pressure reaches the set value of the pressure
switch, the pressure switch contact opens and the compressor switches to unload operation for a period of time
that is equivalent to the time value set up on the “unload time” timer (parameter P15 - default 2 min).
During the unload phase, the LED ( / ) flashes with regularity to indicate that the compressor is running in unload
mode. When the timer has elapsed, the motor is stopped and the led ( / ) starts to flash with two consecutive
impulses and an interaval of 1 s; if no alarms are active, the value of the oil temperature appears on the display.
As soon as the pressure drops to the load value that is set up on the pressure switch, and after a time not below
the restarting delay (parameter P17- default 15 s) the motor is restarted automatically via a star-delta sequence.
If the pressure drops to the load value level before the unload timer has elapsed, the compressor switches
immediately back to load mode without any stopping of the motor.
When the “Unload time” timer elapses, the motor stops. The oil temperature remains steady up
on the display and to indicate that the machine is not OFF but is still in stand-by condition the
led starts to flash with two consecutive impulses and an interval of 1 s . Be very careful, as in
this condition, the compressor restarts without prior notice as soon as the pressure drops down
to the load value level.
• with pressure transducer
When the compressor is in load operation, the LED ( / ) on the right hand side of the display lights steadily to
indicate that the compressor is running in load mode. When the pressure reaches the unload value ( parameter
P02), the compressor switches to unload operation for a maximum period of time that is equivalent to the time
value set up on the “unload time” (parameter P15 - default 2 min).
During the unload phase, the LED ( / ) flashes with regularity to indicate that the compressor is running in unload
mode. When the unload time has elapsed, the motor is stopped and the LED ( / ) starts to flash with two
consecutive impulses with an interval of 1 s; if no alarms are active, the value of the plant pressure appears on the
display.
As soon as the pressure drops to the set load value , and after a time not below the restarting delay( parameter
P17- default 15 s) the motor is restarted automatically via a star-delta sequence.
If the pressure drops to the load value level before the unload timer has elapsed, the compressor switches
immediately back to load mode without any stopping of the motor.
When the “Unload time” timer elapses, the motor stops. The oil temperature remains steady up
on the display and to indicate that the machine is not OFF but is still in stand-by condition the
led starts to flash with two consecutive impulses and an interval of 1 s . Be very careful, as in
this condition, the compressor restarts without prior notice as soon as the pressure drops down
to the load value level.
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