3.6
Troubleshooting
Problem
Cause
Counter measures
Motor does not start,
no rotor noise.
At least two power lines are
interrupted.
Eliminate interruption by
means of fuses,
terminals or broken wire.
Motor does not start,
humming noise.
Interruption in one power
line.
Eliminate interruption by
means of fuses,
terminals or broken wire.
Impeller jammed.
Open cover, remove
foreign material, clean; if
necessary check impeller
gap adjustment and
correct if necessary.
Impeller defective.
Replace impeller.
Motor bearings defective.
Replace bearings.
Motor protective
circuit-breaker trips
again after motor is
switched on, power
consumption is too
high.
Short circuit in the winding
Arrange for winding to be
inspected.
Motor overloaded
Reduce operating
pressure, clean filter,
silencer, connecting
pipes if necessary.
Blower jammed
Open cover, remove
foreign material, clean; if
necessary check impeller
gap adjustment and
correct if necessary.
No vacuum or too
weak vacuum is
produced
Leak in the system
Make system air-tight
Wrong direction of rotation
Change direction of
rotation. (Changeover
two motor wires.)
Wrong frequency
Correct frequency
Blower too small
Use larger blower;
Fit new shaft seal;
Pay attention to
conversion of pressure
values;
Clean impeller, replace
defective impeller with
new one.
Blower not air-tight
Sealing disc defective
Inspect sealing disc.
