BUSCH WY 4500 C, Installation And Operating Instructions Manual

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The vacuum pump or the drive motor is
jammed or seized Make sure that the drive motor is
disconnected 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
service)
The drive motor is defective Change the drive motor (Busch service)
The vacuum pump is jammed or seized Solid foreign matter has entered the vacuum
pump Have the vacuum pump repaired (Busch
service)
Make sure the suction line is equipped with a
mesh screen
If necessary fit a mesh screen at the inlet
Corrosion in the vacuum pump from
remaining condensates Have the vacuum pump repaired (Busch
service)
Check the process
Follow the instructions in chapter “Installation
and Commissioning, Operating Notes”
The vacuum pump starts, but labours or runs
noisily or rattles
The drive motor draws too high a current
(compare with initial value after
commissioning)
Connection(s) in the drive motor terminal box
are defective
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
Wrong oil quantity, unsuitable oil type Use one of the recommended oils in the
correct quantity
(see “Oil”, Oil change see “Maintenance”)
Foreign particles in the vacuum pump
Seized bearings
Have the vacuum pump repaired (Busch
service)
The vacuum pump is very noisy Defective bearings Have the vacuum pump repaired (Busch
service)
Worn coupling element Replace the coupling elements
Defective gears Have the vacuum pump repaired (Busch
service)
Noise at the sealings Insufficient lubrication Check oil levels and top up with oil
Worn sealing (wear parts) Change sealing
The vacuum pump is very hot
(the temperature of the drained oil must not
exceed 90°C)
Cooling water flow is too low Check the cooling water circuit and adjust the
flow if necessary
Ambient temperature too high Keep within the permitted ambient
temperature range
Temperature of the gases at inlet too high Keep within the permitted temperature range
for the gases at inlet
Mains frequency or voltage outside tolerance
range Provide a more stable power supply
The oil is black Oil change intervals are too long
The oil has overheated
Drain the oil
Fill in new oil
(see “Maintenance”)
In case the oil life is too short : use oil with
better heat resistance (see “Oil”) or fit
additional cooling
Troubleshooting
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