BUSCH DOLPHIN VL Systems, Instruction Manual Supplement

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Troubleshooting | 12
Instruction Manual Supplement DOLPHIN VL Systems_EN_en 27 | 36
12 Troubleshooting
Problem Possible Cause Remedy
The machine does not start. The motor is not supplied with
the correct voltage.
●
Check the power supply.
Corrosion between the rotor
and the housing.
●
Eliminate by use of anti-cor-
rosion liquid.
●
Repair the machine (contact
Busch).
Solid foreign matter has en-
tered the machine.
●
Remove the solid foreign
matter or repair the ma-
chine (contact Busch).
●
Install an inlet screen if nec-
essary.
Ice in the machine, the operat-
ing liquid has frozen.
●
Carefully warm up the ma-
chine.
●
Defrost the operating liquid.
The motor is defective.
●
Replace the motor.
The machine runs very noisily
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 op-
erating liquid too high.
●
Check Operating Liquid Set-
tings.
●
Provide a different operat-
ing liquid or a stronger drive
motor.
The machine runs in the wrong
direction.
●
Check the direction of rota-
tion, see
Wiring Diagram
Three-Phase Motor [
➔
17].
Defective bearings.
●
Repair the machine (contact
Busch).
The vacuum pump cavitates
(periodic formation and col-
lapsing of steam bubbles in the
operating liquid).
●
Consult the chapter Prevent-
ing Cavitation.
●
Adjust cooling liquid flow
rate to reduce the tempera-
ture of the operation liquid.
Worn coupling element.
●
Check the coupling and re-
pair it if necessary.