Compressor Is Running But Produces No Pressure - KAESER SM 8 Service Manual

Possible cause:
Motor is running two phase: defective
motor or blown fuse.
Oil separator cartridge is contamina-
ted.
Motor starts against pressure because
system does not get vented.
Airend is defective.
Ambient temperature is above 104•F.
Defective motor: bad bearings or short
circuit in windings.
11.2.3

Compressor is running but produces no pressure

Possible cause:
Airend rotates in wrong direction.
Inlet valve does not open or opens
only partially.
Vent valve does not close at full load.
Minimum pressure check valve is de-
fective.
Leaks in plant system.
Plant system air, demand exceeds ca-
pacity of compressor
Air leak in unit.
Socket is still in the hose coupling at
the oil separator tank or aftercooler.
Safety relief valve has blown off.
Airend is defective.
Appendix
Remedy:
Check input power, check wiring, tigh-
ten any loose connections.
Replace fuse(s) or motor if necessary.
Check pressure differential across car-
tridge. Replace cartridge and dirt trap
strainer if necessary.
Check ball valve in vent line and open
if it is closed.
Check the diaphragm in the vent valve
and replace if defective.
Check the minimum pressure check
valve. Adjust minimum pressure func-
tion or replace defective parts as ne-
cessary.
Check airend and replace if defective.
Provide adequate compressor ventila-
tion.
Repair or replace motor.
Remedy:
Reverse motor polarity.
Check the inlet valve, control valve and
lines. Replace defective parts as
needed
Check the combined control/vent valve
and control lines. Replace defective
parts as needed.
Check the valve and replace defective
parts.
Check for open valves, loose connec-
tions, defective tools, etc.
Reduce system demand or install
additional compressor(s).
Tighten loose connections, repair or
replace defective parts as necessary.
Remove socket from coupling.
See chapter 11.2.5.
With unit running, slowly and carefully
place hand over air inlet filter casing.
There should be considerable suction.
If not, airend is producing no pressure.
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