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Instruction book
8
Problem solving
8.1
Problem solving
Control panel
Faults and remedies
Condition
Compressor starts running,
but does not load after a delay
time
AIF999999
• Before starting any maintenance or repairs, stop the compressor.
• Depressurize the air system as follows:
• Close the air outlet valve.
• On compressors equipped with Electronic Water Drains (EWD), press the
test buttons on top of the electronic water drains.
• Press the emergency stop button.
• Open the isolating switch (customer's installation) to switch off the voltage to the
compressor, and lock it (Lock Out - Tag Out procedure, LOTO).
• Repairs inside the speed regulation cabinet must only be carried out by Atlas
Copco.
• Apply all relevant safety precautions.
• Wait at least 6 minutes before starting any electrical repairs as hazardous high
voltage remains on the condensers of the variable speed drive for 6 minutes after
switching off the voltage.
Control panel of controller
Fault
Pressure in air net is above
pre-set loading pressure
Remedy
Compressor will load when pressure in air
net drops to pre-set loading pressure
97
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