Problem Solving - Atlas Copco LF 2 Instruction Book

Instruction book
7

Problem solving

Condition
Insufficient air pressure
Unit does not speed up
Air receiver pressure rises above
maximum and causes safety valve to
blow
Receiver does not hold pressure
Too frequent starting/too short
operating periods
Unit does not start
2920 7090 00
Fault
Air leak
Air filter choked
Air pressure switch incorrectly
set
Air consumption exceeds
maximum output of compressor
Damaged valve
Unloader malfunctioning
Solenoid valve out of order
Voltage drop at motor terminals Consult power supplier. Use
Unloader malfunctioning
Solenoid valve out of order
Blow-off silencer choked
Air pressure switch or pilot
valve incorrectly set or out of
order
Solenoid valve defective
Unloader malfunctioning
Blow-off silencer choked
Check valve leaks
Air leaks
Air pressure switch or pilot
valve incorrectly set
Check valve leaks
Electrical failure
Remedy
Check and correct as
necessary
Replace filter
Adjust switch
Check equipment connected
Inspect valves and replace
parts where necessary
Inspect and replace parts
where necessary
Remove and check. Replace if
necessary
correct size of cable
Inspect and replace parts
where necessary
Remove and check. Replace if
necessary
Replace
Check. Replace switch or valve,
if necessary
Remove and check. Replace if
necessary
Inspect and replace parts
where necessary
Replace
Check for broken valve and
springs
Check and correct as
necessary
Increase pressure difference
Check for broken valve and
springs
Have electrical system
checked. Check fuses and line
terminals for tightness
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