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EN | User Manual
Fault
Excessive compressed
air consumption
Dryer does not switch
over
No expansion
Dryer is continuously
bled
Dryer is excessively
bled
Pressure dew point is
not reached
KE-MT 120-600
Possible cause
Leakage
Solenoid valve Y1/Y2 does
not open correctly.
Solenoid valve Y1/Y2 can-
not be opened properly
(audible humming sound or
valve fl apping).
Control board defective.
Power supply interrupted,
cable broken.
Compressor might be off.
Error in control programme. Restart programme.
Solenoid valve Y3/Y4 can-
not be opened.
Solenoid valve Y3/Y4
cannot be opened properly
(audible humming sound or
valve fl apping).
Expansion valve V4/V5 does
not open correctly.
Muffl er blocked.
Solenoid valve Y3/Y4
cannot be closed properly
(audible humming sound or
valve fl apping).
Expansion valve V4/V5 does
not close correctly.
Solenoid valve Y1/Y2 can-
not be closed
Operating pressure is too
low.
Compressed air volume fl ow
is too high.
Identify and eliminate faults
Remedy
Check condensate trap at
the upstream fi lter (option);
clean, if necessary.
Check supply voltage, ca-
ble, contacts and solenoid;
replace, if necessary.
Check supply voltage.
Check pilot valves; replace,
if necessary.
Check fuse in supply line
and in the switchbox; re-
place, if necessary.
Reconnect the unit to the
power supply.
Check compressor synchro-
nisation circuit.
Check supply voltage, ca-
ble, contacts and solenoid;
replace, if necessary.
Check supply voltage.
Check gaskets for contami-
nation, if nec. clean/renew.
Check muffl er for contami-
nation, if nec. clean/renew.
Check supply voltage.
Check gaskets for contami-
nation, if nec. clean/renew.
Check solenoid and
diaphragm; replace, if
necessary.
Increase operating pressure.
Reduce compressed air
volume fl ow
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