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6.3 Trouble shooting
Symptom
Compressor loaded
automatically to full capacity
after starting
Compressor does not deliver
air or not immediatly after
loading solenoid valve has
been energized.
Compressor capacity or
pressure below normal
Preliminary
Possible cause
Loading solenoid valve stuck in loaded position.
Air intake throttle valve in open position.
Diaphragm of unloader piston cracked
Air intake throttle valve stuck in closed position.
Air leaks in regulating system.
Loading solenoid valve out of order.
Air consumption exceeds capacity of compressor.
Choked air filter element.
Working pressure setpoint incorrect.
Engine not up to max. load speed.
Electric blow-off valve malfunctioning.
Loading solenoid valve leakage.
Compressor element(s) not in order.
Air intake throttle valve remains partially closed.
Corrective action
Remove and check loading solenoid valve.
Replace valve if necessary.
Check position throttle valve.
Disconnect loading solenoid valve from throttle
valve housing and connect independent
compressed-air line to throttle valve housing.
Repeatedly admit air and listen for opening and
closing sound of throttle valve. If sound is not
evident, remove unloader valve assembly,
dismantle and inspect.
Replace parts where necessary.
.
If air blows from venting device, open unloader
piston cover and replace diaphragm.
Disconnect loading solenoid valve from throttle
valve housing and connect independent
compressed-air line to throttle valve housing.
Repeatedly admit air and listen for opening and
closing sound of throttle valve. If sound is not
evident, remove unloader valve assembly,
dismantle and inspect. Replace parts where
necessary.
Same action as above.
Check loading solenoid valve and electric wiring.
Replace valve, if necessary.
Check equipment connected
Remove and inspect air filter element. Clean or
replace element, if necessary.
Adjust setting.
Check engine and correct if necessary.
Check interstage pressure. Check functioning of
loading solenoid valve. Replace diaphragm of
blow-off valve if necessary.
With unit running at max. load speed, disconnect
pipe from loading solenoid valve. If air leaks,
remove and inspect loading solenoid valve.
Replace valve, if necessary.
Check interstage pressure and have compressor
element(s) inspected by Atlas Copco.
Disconnect loading solenoid valve from throttle
valve housing and connect independent
compressed-air line to throttle valve housing.
Repeatedly admit air and listen for opening and
closing sound of throttle valve. If sound is not
evident, remove unloader valve assembly,
dismantle and inspect. Replace parts where
necessary.
Instruction manual
.
51
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