The electrical connection cable is too long or
its diameter too small causing a voltage drop
at the vacuum pump
Use an adequately dimensioned cable
The vacuum pump or the drive motor is jam-
med or seized
Make sure that the drive motor is disconnec-
ted from the power supply
Remove the fan cover
Try to turn the fan by hand
If the unit vacuum pump / drive motor is still
jammed:
Remove the drive motor and check the drive
motor and the vacuum pump separately
If the vacuum pump is jammed:
Have the vacuum pump repaired (Busch ser-
vice)
The drive motor is defective
Change the drive motor (Busch service)
The vacuum pump is jammed or seized
Broken vanes
Have the vacuum pump repaired (Busch ser-
vice)
Check the process
The vacuum pump was run in the wrong di-
rection of rotation
Have the vacuum pump repaired (Busch ser-
vice)
When connecting the vacuum pump, make
sure the vacuum pump will run in the correct
direction of rotation (see “Installation”)
The vacuum pump starts, but runs noisily or
not as it should
The amperage of the motor is too high (com-
pared with the initial value after commissio-
ning)
The motor winding is defective
The drive motor operates on two phases only
Check the proper connection of the wires
against the wiring diagram
Tighten or change the connections
The vacuum pump runs in the wrong direc-
tion (of rotation)
Check rotation of the drive motor. See
“Installation and Commissioning”, change if
necessary
Standstill of the vacuum pump over several
weeks or months in a damp environment
Switch on the vacuum pump and let it warm
up with the inlet closed
Broken vanes
Seized bearings
Have the vacuum pump repaired (Busch ser-
vice)
The vacuum pump is very noisy
Defective bearings
Have the vacuum pump repaired (Busch ser-
vice)
Stuck vanes
Have the vacuum pump repaired (Busch ser-
vice)
The vacuum pump is very hot
Insufficient ventilation
Make sure that the cooling of the vacuum
pump is not impaired by dust/dirt
Clean the fan cover, fans, ventilation grids
and cooling fins
Install the vacuum pump in a narrow space
only if sufficient ventilation can be guaranteed
Ambient temperature too high
Keep within the permitted ambient tempera-
ture range
Temperature of the drawn gases too high
Keep within the permitted temperature range
for the drawn gases
The exhaust filters are partially clogged
(SD/DC)
Replace exhaust filters (SD/ DC)
Mains frequency or mains voltage outside to-
lerance range
Provide a more stable power supply
In case an inlet filter is installed on the suction
connection (a) :
The filter on the suction connection (a) is
partially clogged
Clean or replace the filter
Troubleshooting
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Содержание SD 1063 B
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