BUSCH COBRA NS 0070-0160 C, Installation And Maintenance Instructions Manual

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Monthly:
l Make sure that the vacuum pump has been switched off and that
it cannot accidentally be switched on again
l Check the level of the cooling liquid (see “Checking the cooling
liquid”)
l Check the cooling water (see “Checking the cooling water”)
l Check the electrical connections
l
Carry out a visual inspection of the vacuum pump
l Check the vacuum pump for cooling liquid leaks - in case of leaks,
have the vacuum pump repaired (Busch service)
l Check the vacuum pump for cooling water leaks - in case of leaks,
have the vacuum pump repaired (Busch service)
Yearly:
l Make sure that the vacuum pump has been switched off and that
it cannot accidentally be switched on again
If the inlet is equipped with a mesh screen:
u Check the mesh screen at the inlet and clean it if necessary
l Check the correct operation of the measurement and safety
equipment
l Check the seals and replace them if necessary
l Drain the cooling liquid (see “Draining the cooling liquid”)
l
Perform a vacuum leak test measurement on the pump
l Check the inlet and discharge lines and clean or replace them if
necessary
Every 16’000 operating hours, at the latest
after 4 Years:
l Oil change (see “Oil change”)
l Have a major overhaul done on the vacuum pump (Busch service)
Switching off for maintenance work
l Make sure that the vacuum pump has been switched off and that
it cannot be switched on again accidentally.
l Switch off the main power supply.
l Pull off the water connections (first the water inlet and then the
water outlet) and nitrogen connection.
l Put up the sign “Maintenance work in progress” on or next to the
pump.
Switching on after maintenance work
l Remove the sign “Maintenance work in progress”.
l
Check the level of the cooling liquid; top up with liquid if necessary
(see “Refilling cooling liquid”).
l
Check the oil levels; top up with oil if necessary (see “Refilling
oil”).
l
Connect the water connections (first the water outlet (CWo) and
then the water inlet (CWi)) and nitrogen connection (GC).
l
Switch on the main power supply.
l Make sure that the “Installation prerequisites” are followed.
l Switch on the vacuum pump.
Checking the oil
Checking the oil level
l Make sure that the vacuum pump has been switched off and that
it cannot be switched on again accidentally.
l Indication of the oil level on the various oil sight glasses.
If the oil level does not reach the MIN marking:
u Top up with oil (see “Refilling oil”).
If the oil level exceeds the MAX marking:
u Check the condensate drain.
l Drain the oil (see “Draining the oil”).
Refilling oil
NOTE : Oil does not normally have to be refilled outside the
recommended oil change intervals. A drop in the oil level indicates a
malfunction (see “Troubleshooting”).
CAUTION
Only fill in oil through the oil filler opening.
CAUTION
Risk of injury (burns) with open oil filler orifice.
Risk of injury in case of badly screwed-in plugs.
Remove the oil filler plugs only when the vacuum pump is stopped.
The vacuum pump must only be operated when the oil filler plugs
are firmly tightened up and do not leak.
l Make sure that the vacuum pump has been switched off and that
it cannot be switched on again accidentally.
l Unscrew the oil filler cap (OFP).
l Fill in oil up to the middle of the oil sight glass (OSG).
l
Make sure that the oil level lies between the MIN and MAX
markings on the oil sight glasses.
l
Make sure that the seals of the filler cap are not damaged and that
they sit properly. Replace them if necessary.
l
Screw on the filler cap again.
Checking the colour of the oil
NOTE : The oil must be clear and transparent. A permanent milky
colour is an indication for contamination by foreign bodies. A dark
colour is an indication for oil that has been chemically altered or
contaminated by foreign bodies.
WARNING
Dark colored oil may indicate a hazardous pump condition which
could cause personal injury.
If dark oil similar to the example shown is observed, you have to
contact the Busch Customer Service without delay..
NS 0070-0160 C
Maintenance
0870570353 (En)
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