Version with three-phase motor:
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 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 (r,
22)
Oil could not be compressed and thus broke a
vane (r, 22)
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 (r, 22)
Condensate could not be compressed and
thus broke a vane (r, 22)
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
The drive motor is running, but the vacuum
pump stands still
The coupling (310) between the drive motor
and the vacuum pump is defective
Replace the coupling element (310)
The vacuum pump starts, but labours or runs
noisily or rattles
The drive motor draws a too high current
(compare with initial value after commission
-
ing)
Loose connection(s) in the drive motor termi
-
nal box
Version with three-phase-motor:
Not all drive motor coils are properly con
-
nected
The drive motor operates on two phases only
Check the proper connection of the wires
against the connection diagram
(particularly on motors with six coils)
Tighten or replace loose connections
Version with three-phase motor:
The vacuum pump runs in the wrong direction
Verification and rectification Ú Installation
and Commissioning
Standstill over several weeks or months Let the vacuum pump run warm with inlet
closed
Oil viscosity is too high for the ambient tem-
perature
Use synthetic oil, if necessary use oil of the
next lower viscosity class (CAUTION: opera
-
tion with too low viscosity can cause chatter
marks inside the cylinder)
Warm up the oil with a heater prior to starting
up the vacuum pump, or run the vacuum
pump in intervals in order not to let it get too
cold
Improper oil quantity, unsuitable oil type Use the proper quantity of one of the recom
-
mended oils
(Ú Oil,
Oil change: Ú Maintenance)
No oil change over extended period of time Perform oil change incl. flushing and oil filter
replacement
(Ú Maintenance)
The exhaust filter (p, 122) is clogged and ap
-
pears black from burnt oil
Flush the vacuum pump
Replace the oil filter (h, 100)
Replace the exhaust filter (p, 122)
Fill in new oil
(Ú Maintenance)
In case the oil life is too short: use oil with
better heat resistance (Ú Oil) or retrofit cool
-
ing
Foreign objects in the vacuum pump
Broken vanes (r, 22)
Stuck bearings
Repair the vacuum pump (Busch service)
Troubleshooting RA 0025 - 0040 F
page 16 0870139077 / 051214
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