Aerotec AK28 Manuel Utilisateur page 17

7. POSSIBLE FAULTS AND RELATED PERMITTED REMEDIES
Request the assistance of a qualified electrician for operations on electric components (cables, motor, pressure switch, electric panel, etc).
Fault
Air leak from the valve of the pressure switch.
Reduction of efficiency, frequent start-up. Low
pressure values.
The motor and/or the compressor overheat
irregularly.
After an attempt to start the compressor, it stops
due to tripping of the thermal cutout caused by
forcing of the motor.
During operation, the compressor stops for no
apparent reason.
When operating, the compressor vibrates and
the motor emits an irregular buzzing sound. If it
stops, it does not restart although the sound of
the motor is present.
Irregular presence of oil in the network.
Leaking of condensate from the vent cock.
Any other type of operation must be carried out by authorized Service Centers, requesting original parts. Tampering with the machine may impair its
safety and in any case make the warranty null and void.
Cause
Check valve does not perform its function
correctly due to wear or dirt on the seal.
Condensate drainage cock open.
Rilsan hose not inserted correctly in pressure
switch.
Excessively high consumption.
Leaks from joints and/or pipes.
Clogging of the suction filter.
Slipping of the belt.
Insufficient ventilation.
Closing of air ducts.
Insufficient lubrication.
Start-up with head of the compressor charged.
Low temperature.
Voltage too low.
Incorrect or insufficient lubrication.
Inefficient electrovalve.
Tripping of the thermal cutout of the motor.
Electric fault.
Single-phase motors:
faulty capacitor.
3-phase motors:
One of the phases of the 3-phase power supply
is missing due probably to blowing of a fuse.
Too much oil inside the unit.
Wear on segments.
Presence of dirt/grit inside the cock.
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Remedy
Unscrew the hex-shaped head of the check
valve, clean the housing and the special rubber
disk (replace if worn). Re-assembler and tighten
carefully (figures 15a-15b).
Close the Condensate drainage cock.
Insert the Rilsan hose correctly inside the
pressure switch (fig. 16).
Decrease the demand of compressed air.
Change gaskets.
Clean/replace the suction filter
(figures 11a-11b-11c-11d).
Check belt tension (fig. 14).
Improve ambient conditions.
Check and if necessary clean the air filter.
Top up or change oil
(figures 17a-17b-17c).
Release the compressor head by using the
pressure switch push button.
Improve ambient conditions.
Check that the mains voltage matches that of
the dataplate. Eliminate any extensions.
Check level, top up and if necessary change
the oil.
Call the Service Center.
Check level oil.
Single-stage, mono-phase versions:
operate on the button of the pressure switch
returning this to the OFF position (fig. 1a).
Reset the thermal cutout (fig. 2) and restart
(figures 1b).
If the fault persists, call the Service Center.
Versions with delta-star starter:
operate on the button of the thermal cutout
located inside the box of the electric panel (fig.
3c) and restart (fig. 6d).
If the fault persists, call the Service Center.
Other versions:
Operate on the button of the pressure switch
returning this to the OFF position and then to
ON again (fig. 1a-1b).
If the fault persists, call the Service Center.
Call the Service Center.
Have the capacitor replaced.
Check the fuses inside the electric panel or the
electric box and if necessary replace those that
have been damaged (fig. 18).
Check oil level.
Call the Service Center.
Clean the cock.
G
B