STEUEREINHEIT AIRBASIC 2 –GEBRAUCHSANWEISUNGEN
AIRBASIC 2 CONTROLLER – USER MANUAL
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With this feature, the operation of the compressor can be disabled from a remote position in order to prevent
unauthorized personnel from starting the compressor with the push buttons on the controller.
If the remote control feature is to be used with the START/STOP contact connected to the
controller, it is strongly advisable to affix a sign by the machine warning bystanders that the
compressor may by started anytime from a remote location. Machine start and machine restart
operations can be performed via a control device other than the one provided, as long as this
does not pose any hazards.
Compressor start-up
When the compressor is started (either via the ON button or by closing the remote contact), the controller performs
a number of checks at the inputs to make sure that there are no conditions likely to pose hazards to the machine
and/or the operators.
If abnormalities are found, the compressor start-up is inhibited and an error message appears on the
controller display. If no abnormality is found, the compressor is allowed to start.
• with pressure switch
When start-up is initialized, that is, when no alarms are active, the controller checks the value of the line pressure
switch contact. If the pressure switch contact is closed, the motor is started according to the star-delta start-up
sequence. If the pressure switch contact is open (pressure in the network), the compressor goes into stand-by
mode and the motor is not started until the pressure level drops to the load value level. When the load value level is
reached, the pressure switch contact closes and the compressor is started.
• with pressure transducer
When start-up is initialized, that is, when no alarms are active, the controller checks the value of the line pressure
through the pressure transducer. If the pressure is below the load pressure (parameter P03), the motor is started
according to the star-delta start-up sequence. If the pressure is above the unload pressure (parameter P02), the
compressor goes into stand-by mode and the motor is not started until the pressure level drops to the load value
level. When the load value level is reached, the compressor is started.
The relay outputs relating to the line and star contactors are energized for the equivalent of the star time
(parameter P12 - default 5 s). When star time has elapsed, the controller switches from star to delta with a ‘safety’
delay (applied between the release of the star contactor and the coming into operation of the delta contactor). This
delay is equivalent to the time value set up on the star-delta switching time (parameter P13 - default 20 ms). When
the switching timer has elapsed, the outputs relating to the line and delta contactors are energized.
In order to stabilize the motor’s rotation speed , the load solenoid valve is energized with a delay that is equivalent
to the time value set up on the “launch timer” parameter (parameter P14 - default 1s). The delay is in relation to the
closure of the delta contactor. Once the solenoid valve has been energized, the compressor enters into load-
operation stage.
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