KAESER EPC 1000-2-500, Service Manual

Page: 54 / 110

Fault Possible cause Remedy
Motor overload protection trips
out after a long time.
Current too high because of low
supply voltage.
Check power supply cable con‐
ductor cross-sections. Check
and tighten connection termi‐
nals.
The machine runs continuously
but maximum pressure is not
reached.
Air filter clogged. Clean or change the air filter.
Valve plate leaking air or coked. Check or clean the valve plate.
Outlet valve reed broken.
Replace valve plate.
Machine leaks air. Seal leak or replace leaking part.
Leakage from an air consumer
connected to the air system.
Check possible leakage points.
The air demand is greater than
the machine's air delivery ca‐
pacity.
Use a larger machine.
Solenoid valve blows off contin‐
uously. Solenoid coil is defec‐
tive.
Change the solenoid valve.
Machine cuts in and out too of‐
ten.
Air receiver filled with conden‐
sate.
Drain condensate.
Machine switches off. The oil level monitor (option C5)
has triggered.
Top up the oil.
The machine switches off and air
escapes from the solenoid valve.
Check valve is defective. Replace the check valve.
The solenoid valve loses air
while the machine is running.
The solenoid valve does not
close.
Power to the solenoid valve is
interrupted.
Clean / replace the solenoid
valve.
Check power supply.
The machine does not vent after
switching off.
Solenoid valve dirty.
Power to the solenoid valve is
interrupted.
Clean / replace the solenoid
valve.
Check power supply.
Air leaks from the pressure
switch while the machine is run‐
ning.
Defective switch diaphragm. Replace the pressure switch.
The solenoid valve does not
close.
Power to the solenoid valve is
interrupted.
Clean / replace the solenoid
valve.
Check power supply.
Whistling sound from the cylin‐
der head.
Cylinder head fixing screws
loose. Gasket defective.
Tighten the cylinder head fixing
screws. Replace gasket.
The pressure relief valve blows
off before the cut-out pressure is
reached.
Pressure switch incorrectly set. Check pressure switch setting.
Valve spring defective.
Replace the pressure relief
valve.
Dirt or foreign bodies on the
valve seat.
Let the pressure relief valve blow
off briefly.
Pressure relief valve on the air
cooler blows off prematurely.
Cooler clogged. Cooler pipe
coked.
Clean the cooler.
9 Fault Recognition and Rectification
9.2 Alarms
44
Service Manual 2-stage piston compressor
EPC
No.: 9_9431_02 E