General Maintenance Operation Table - ABAC GENESIS Series Use And Maintenance Handbook

cooler is bypassed; the oil passes into filter FO and returns to the air end.
Temperature sensor STO inserted in the delivery stub pipe and connected to the microprocessor permits
constant monitoring of the temperature inside the air-end unit.
The capacity delivered is controlled differently on fixed speed and variable speed machines. In fixed speed
compressors, once the rated running pressure has been reached, the intake valve closes. The internal receiver
pressure is vented to reach a value of approximately 2 bars.
This value is obtained by means of minimal amount of intake air through the intake valve. This ensures that
the pressure required for correct system lubrication is maintained. Consequently, the machine can idle with
reduced power intake.
After the predefined "idling" time, the machine stops, ready to start again automatically if the pressure drops
below the minimum threshold.
In variable speed compressors, the control system modifies speed of rotation in order to reach and maintain
an average pressure between the minimum and maximum pressure set.
In the case of very low air consumption, once the maximum operating pressure has been reached, the com-
pressor switches to idling as described for the fixed speed compressor
In this case, the duration of the idling phase is shorter; at the end of this phase, the compressor stops, ready
for subsequent automatic restart.
The operator-controlled machine stopping phases also differ as regards the two types of compressor.
For fixed speed machines, ordinary stopping is timed; the machine is set to «idling» and the receiver is
gradually discharged.
For variable speed machines, the stopping phase is controlled through ramping down of the motor, during
which the system is depressurised.
The machine is also protected against any type of overpressure (internal faults or faults in other compressors
in parallel).

General maintenance operation table

The following table shows all the maintenance operations required by the machine.
You will find this symbol next to operations requiring the intervention of Service Centre
personnel
Operation
Check on
suction prefilter
-
Replace
suction prefilter
Check air filter
Replace *
air filter
To be carried
Reference out by a
Service Centre
10.3
10.3
10.4
10.4
P. 69 - Chap. 10 Maintenance
After the After the Every
first first 500
100 hours 1000 hours hours
• • •
•
• • •
•
G
B
10.2
Every Every Every
1000 2000 4000
hours hours hours
•
•