Elmo Rietschle G-BH10 - Manual (Page 22)

Servicing
610.44431.40.000 22 / 30 © Gardner Denver Deutschland GmbH
7.2 Repair/ Troubleshooting
Fault Cause Remedy Carried out by
At least two power supply
leads interrupted. Check fuses, terminals and supply leads and
close circuit where interrupted. Electrician
No signal at control signal
inputs A and B. Apply control signals, see section 5.2.1,
"Electrical Connection (Motor)", page 11. Electrician
Motor does
not start, no
motor noise.
No speed reference value
given. Set speed reference value, see section 5.2.1,
"Electrical Connection (Motor)", page 11. Electrician
Impeller jammed. Open pump lid, remove dirt and foreign bodies,
as described in section 7.1.1, "Cleaning", pa-
ge 20. Qualified per-
sonnel
Impeller damaged. Replace impeller. Service
Motor bearing damaged. Replace "complete casing" (i.e. the unit consist-
ing of casing, stator and two ball bearings).
Service
Motor does
not start,
humming
noise.
Wrong connection of mo-
tor connecting leads. Check and, if necessary, correct the connection
of the motor phases and hall signals to the drive
electronics, see section 5.2.1, "Electrical Con-
nection (Motor)", page 11. Electrician
Winding short-circuit. Have winding checked. Electrician
Motor overload. Reduce operating pressure. If necessary, clean
filter, silencers, and pipes. Qualified per-
sonnel
Power con-
sumption too
high.
Impeller jammed. See "Motor does not start, humming noise". Qualified per-
sonnel
Leak in the system. Seal leak in the system. Qualified per-
sonnel
Wrong direction of rota-
tion. Reverse direction of rotation by applying the
correct signals to the control signal inputs A and
B see section 5.2.1, "Electrical Connection (Mo-
tor)", page 11. Electrician
Speed reference value
representing the desired
speed (n
des
) too low.
Adjust speed reference value (n
des
) within a
range of 0...10 V.
Qualified per-
sonnel
Temperature of the elec-
tronics too high. Provide sufficient heat dissipation and cooling. Qualified per-
sonnel
Blower too small. Use bigger blower. Operator /
qualified per-
sonnel
Density of the pumped
gas unequal 1.23 g/m³
(= density of air at 15°C
[59°F] and 1013 mbar). Use bigger blower. Operator /
qualified per-
sonnel
No vacuum /
pressure or
too little vac-
uum / pres-
sure gener-
ated.
Impeller dirty. Clean impeller;
if worn, have impeller replaced. Qualified per-
sonnel / Service
Flow rate too high. Increase pipe cross section, clean pipe. Qualified per-
sonnel Abnormal
screeching
noise.
Ball bearing damaged. Replace "complete casing" (i.e. the unit consist-
ing of casing, stator and two ball bearings). Service
Impeller leak. Relative pressure be-
tween blower and sur-
roundings too high.
The permissible differential pressure between
the pump interior and the surroundings has
been exceeded. Make sure that the differential
pressure is not exceeded. Qualified per-
sonnel
Current feed
to the mains. Caused by switching off
or rapidly reducing the
speed of the blower. Insert a diode (Schottky diode, size 6A respec-
tively10A) in the 24V respectively 48V supply
lead (+V
CC
).
Electrician