VEMAG 168.1004, Operating Instructions Manual, Page: 165 / 167

The gas conveyed by the vacuum pump smells
displeasing Process components evaporating under vac-
uum
Readily volatile and thus gaseous components
of the oil, e.g. additives, particularly right after
an oil change.
Note: This is no indication of a malfunction of
the oil separator. The oil separator is able to
retain droplets of oil, however no gaseous
components of it.
Check the process, if applicable
Use a different type of oil, if applicable
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 volt-
age
The drive motor starter overload protection is
too small or trip level is too low Compare the trip level of the drive motor
starter overload protection with the data on
the nameplate, correct if necessary
In case of high ambient temperature: set the
trip level of the drive motor starter overload
protection 5 percent above the nominal drive
motor current
One of the fuses has blown Check the fuses
The connection cable is too small or too long
causing a voltage drop at the vacuum pump Use sufficiently dimensioned cable
The vacuum pump or the drive motor is
blocked Make sure the drive motor is disconnected
from the power supply
Remove the fan cover
Try to turn the drive motor with the vacuum
pump by hand
If the vacuum pump is blocked:
Repair the vacuum pump (Busch service)
The drive motor is defective Replace the drive motor (Busch service)
The vacuum pump is blocked Solid foreign matter has entered the vacuum
pump Repair the vacuum pump (Busch service)
Make sure the suction line is equipped with a
screen
If necessary additionally provide a filter
Corrosion in the vacuum pump from remain-
ing condensate Repair the vacuum pump (Busch service)
Check the process
Observe the chapter Conveying Condensable
Vapours (
Ú
page )
The vacuum pump was run in the wrong di-
rection Repair the vacuum pump (Busch service)
When connecting the vacuum pump make
sure the vacuum pump will run in the correct
direction (
Ú
page : Installation)
After shutting down the vacuum pump the
vacuum system exerted underpressure onto
the pump chamber which sucked back exces-
sive oil from the oil separator into the pump
chamber
When the vacuum pump was restarted too
much oil was enclosed between the vanes
Oil could not be compressed and thus broke a
vane
Repair the vacuum pump (Busch service)
Make sure the vacuum system will not exert
underpressure onto the shut-down vacuum
pump, if necessary provide an additional
shut-off valve or non-return valve
After shutting down the vacuum pump con-
densate ran into the pump chamber
When the vacuum pump was restarted too
much condensate was enclosed between the
vanes
Condensate could not be compressed and
thus broke a vane
Repair the vacuum pump (Busch service)
Make sure no condensate will enter the
vacuum pump, if necessary provide a drip leg
and a drain cock
Drain condensate regularly
KC 0016 D VEMAG
0870146800 / 100111
page 5