BUSCH DOLPHIN VL 0100 A, Instruction Manual Supplement

Page: 26 / 36

11 | Troubleshooting
26 / 36 Instruction Manual Supplement DOLPHIN VL Systems ATEX_EN_en
The machine runs very noisi-
ly or rattles. The operating liquid level is
too high. • Adjust the regulating
valves to drain the pump
down to center line.
Density or viscosity of the
operating liquid too high.
• Check
Technical Data
[ ► 28]
.
• Provide a different oper-
ating liquid or a higher
power motor.
The machine runs in the
wrong direction. • Check the direction of ro-
tation.
Defective bearings. • Repair the machine (con-
tact Busch).
The vacuum pump cavitates
(periodic formation and col-
lapsing of steam bubbles in
the operating liquid). • Adjust the anti-cavitation
valve.
• Adjust cooling liquid flow
rate to reduce the tem-
perature of the operation
liquid.
Worn coupling element. • Check the coupling and
repair it if necessary.
The machine runs too hot. Insufficient air ventilation. • Make sure that the cool-
ing of the machine is not
impeded by dust/dirt.
• Clean the fan cowling,
the fan, the ventilation
grille and the cooling fins
of the motor.
Ambient temperature too
high. • Observe the permitted
ambient temperature, see
Technical Data [ ► 28]
.
Temperature of the process
gases at the inlet too high. • Observe the permitted
gas inlet temperature, see
Technical Data [ ► 28] .
Insufficient gas transfer. • Introduce a suitable inert
gas or air via the anti-cav-
itation connection.
Partial blockage in the suc-
tion, discharge or pressure
line. • Remove the blockage.
Operating liquid not cooled
sufficiently by the heat ex-
changer. • Check cooling liquid flow
Technical Data [ ► 28] .
• Clean heat exchanger.
• Reduce cooling liquid
temperature.