Troubleshooting
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be carried out by qualified personnel that know and observe the following regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or equivalent national accident prevention regulations.
CAUTION
During operation, the surface of the vacuum pump may exceed temperatures of 70°C.
Risk of burns!
Do not touch the hot surfaces of the vacuum pump or wear heat protection gloves.
Please contact your local Busch representative if you have any doubts or questions
Problem
Possible Cause
Remedy
The vacuum pump does not reach the usual
working pressure
The vacuum system or suction line are not
leak-tight
Check piping, hoses or pipe connections for
possible leaks
The current consumption of the motor is too
high (compared with the initial value after
commissioning)
Jammed lobes
Defective bearings
Inspection of the lobes
Have the vacuum pump repaired (Busch
service)
Reaching operational pressure takes too long
In case an inlet filter is installed on the suction
side : The filter on the suction flange is
partially clogged
Clean or change the filter
Partial clogging or blockage in suction or
discharge lines
Remove foreign particles
Suction or discharge lines too long, or too
small (diameter)
Use larger diameter lines
Internal parts worn or damaged
Have the vacuum pump repaired (Busch
service)
The vacuum pump runs in the wrong
direction
Check rotation of the driving motor. See
“Installation and Commissioning”, change if
necessary
The vacuum pump does not start
The drive motor is not supplied with the
correct voltage or is overloaded
Supply the drive motor with the correct
voltage
The drive motor trip switch protection is too
weak or trip level is too low
Compare the technical data of drive motor
trip switch with the data on the nameplate of
the motor.
Correct if necessary
In case of high ambient temperature:
Set the trip level of the drive motor trip
switch 5% above the nominal drive motor
current
One of the fuses has blown
Check the fuses
The connection cable is too long or too small
causing a voltage drop at the vacuum pump
Use adequately dimensioned cable
Troubleshooting
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