7 Problem solving
Warning
Always apply all relevant Safety precautions.
Before carrying out any maintenance, repair work or adjustment, press the stop button,
wait until the compressor has stopped and close the air outlet valve.
Open the manual drain valve(s).
Press the emergency stop button and switch off the voltage. Open and lock the isolating
switch.
Depressurise the oil separator vessel by opening the oil filler plug one turn.
For location of components: see sections Introduction, Condensate system and Initial
start.
The air outlet valve can be locked during maintenance or repair as follows:
• Close the valve.
• Remove the screw fixing the handle with the wrench delivered with the
compressor.
• Lift the handle and turn it until the slot of the handle fits over the blocking edge on
the valve body.
• Fit the screw.
• Always switch off the voltage. Only pressing the emergency stop button is not
sufficient to make the compressor voltage free.
• If the machine is equipped with an automatic restart after voltage failure function
and if this function is active, be aware that the machine will restart automatically
when the power is restored if it was running when the power was interrupted.
Faults and remedies, compressor
On compressors equipped with a graphic controller, if the alarm LED is lit or flashes, consult
sections Event history menu or Service menu.
Condition Fault Remedy
Compressor does not start or
stops during operation.
Motor overload relay (F21) open Find cause and remedy. Replace
if necessary.
Circuit breaker (Q15) or fan motor
overload (F15) open
Find cause and remedy. Replace
if necessary.
Too high temperature in oil
separator vessel or temperature
switch (TSHH1) defective
Find cause and remedy. Replace
if necessary.
Instruction book
2920 7190 02 93
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