Troubleshooting
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be carried out by qualified personnel that knows and adheres to 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 100°C.
Risk of burns!
Do not touch the hot surfaces of the vacuum pump.
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 lines are not
leak-tight
Check piping, hoses or pipe connections for
any possible leaks
The amperage of the motor is too high (com-
pared with the initial values after commissio-
ning)
The exhaust filter is dirty
Replace the exhaust filter
(see “Maintenance”)
Reaching operational pressure takes too long
In case an inlet filter is installed on the suction
side (
IN
):
The filter on the suction side (
IN
) is partially
clogged
Clean or change the filter
Partial clogging or blockage in suction or dis-
charge lines
Remove foreign particles
Suction or discharge lines too long or too
small (diameter)
Use larger diameter lines
The disc of the non-return valve (SD) at the
inlet is (fully or partially) jammed in closed po-
sition
Dismantle the inlet, clean the valve and reas-
semble
A pressure valve is jammed in a partially open
position
Dismantle, clean, check and reassemble the
pressure valve (Busch service)
A vane (
VA
) is jammed in the rotor or
damaged
Free the vanes or replace them with new ones
(Busch service)
The radial clearance between the rotor (
RT
)
and
the cylinder is no longer correct
Reset the clearances in the vacuum pump
(Busch service)
Internal parts of the vacuum pump worn or
damaged
Have the vacuum pump repaired (Busch ser-
vice)
The vacuum pump does not start
The drive motor is not supplied with the cor-
rect voltage or is overloaded
Supply the drive motor with the correct vol-
tage
The drive motor trip switch protection is too
weak or trip level is set too low
Compare the technical data of the drive motor
trip switch with the data on the name plate 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
Troubleshooting
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