BUSCH COBRA AC 1000 F, Installation And Maintenance Instructions Manual

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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
mesh screen
If necessary additionally provide a filter
Corrosion in the vacuum pump from remaining
condensate Repair the vacuum pump (Busch service)
Check the process
Observe the chapter “Installation and Commis-
sioning, Operating Notes”
The vacuum pump was run in the wrong direc-
tion Repair the vacuum pump (Busch service)
When connecting the vacuum pump make sure
the vacuum pump will run in the correct direc-
tion (see “Installation”)
Condensate ran into the vacuum pump Repair the vacuum pump (Busch service)
Drain condensate regularly
The vacuum pump starts, but labours or runs
noisily or rattles
The drive motor draws a too high current (com-
pare with initial value after commissioning) Connections in the drive motor terminal box are
defective
Not all drive motor coils are properly connected
The drive motor operates on two phases only Check the proper connection of the wires
against the connection diagram
Tighten or replace loose connections
The vacuum pump runs in the wrong direction Verification and rectification see “Installation
and Commissioning”, correct if necessary
Standstill over several weeks or months Let the vacuum pump run warm with inlet
closed
Oil viscosity is too high for the ambient tempe-
rature Use oil with a better viscosity class
Improper oil quantity, unsuitable oil type Use the proper quantity of one of the recom-
mended oils
(see “Oil”, oil change see “Maintenance”)
No oil change over extended period of time Perform oil change incl. flushing (see “Mainte-
nance”)
Foreign objects in the vacuum pump
Stuck bearings Repair the vacuum pump (Busch service)
The vacuum pump runs very noisily Defective bearings Repair the vacuum pump (Busch service)
Worn coupling element Replace the coupling element
The vacuum pump runs very hot
(the oil sump temperature shall not exceed
100 °C) Ambient temperature too high Observe the permitted ambient temperatures
Temperature of the inlet gas too high Observe the permitted temperatures for the
inlet gas
Oil level too low Top up oil
Check the oil filler and drain plugs
Check the mechanical seals
Oil burning by an overheating of the vacuum
pump Drain oil
Fill in new oil
(see “Maintenance”)
In case the oil life is too short: use oil with
better heat resistance or retrofit cooling
Mains frequency or voltage outside tolerance
range Provide a more stable power supply
In case a mesh screen is installed on the suction
connection:
The mesh screen on the suction connection is
partially clogged
Clean the mesh screen
If cleaning is required too frequently install a
filter upstream
Troubleshooting
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