Checking the cooling water
Checking the cooling water flow
l
Check the cooling water flow regularly
If the flow drops, check for leaks
u
Make sure that the specifications of the cooling water are
followed
Checking the nitrogen
Checking the nitrogen flow
l
Check the nitrogen flow regularly
If the flow drops, check for leaks
u
Make sure that the specifications of the nitrogen are followed
Checking the current consumption
l
Check the current intensity of the motors of the DP and MB
vacuum pumps
An increased intensity is an indication for a fault (see “Troubleshoo-
ting”)
Checking the sound absorber
(accessory)
l
Make sure that the condensate does not collect at the exhaust of
the vacuum pump
l
Drain the condensate at the drain opening and collect it in a
container
l
Dispose of the condensate according to applicable environmental
protection regulations
l
Check the sound absorber regularly and clean it if necessary
Checking the leak-protection
non-return valve (accessory)
l
Check the leak-protection non-return valve regularly and clean it if
necessary
CAUTION
Wear protective clothing when carrying out maintenance work on
the sound absorber and leak-protection non-return valve.
There could still be residues of contamination.
Overhaul
CAUTION
Inappropiate maintenance work on the vacuum pump can damage
the pump.
Danger of explosion!
If requirements are not met, the vacuum pump may not be switched
on!
Should work exceed the dismantling work described in this
handbook, it may only be carried out by authorised persons.
DANGER
If the vacuum pump has pumped gases that were contaminated
with foreign bodies that are hazardous to health, the oil and
condensate are also contaminated with these foreign bodies.
These foreign bodies can penetrate into pores, openings and other
internal parts of the vacuum pump.
There is a health hazard when dismantling the vacuum pump.
There is also a danger to the environment.
Prior to shipping, the vacuum pump must imperatively be
decontaminated and the degree of contamination must be
documented in a declaration of decontamination ("Declaration of
Decontamination"), which can be downloaded from
www.buschvacuum.com.
Busch service will only accept vacuum pumps that come with a com-
pletely filled in and legally binding signed form.
Removal from service
Temporary removal from service
Before disconnecting the intake and exhaust lines and switching off the
cooling water and nitrogen lines, make sure that the lines have adjus-
ted to atmospheric pressure
Recommissioning
CAUTION
If the vacuum pump was switched off for a longer period of time,
the rotors of the COBRA NS vacuum pump can be jammed.
Turn the screw rotors by hand.
l
Make sure that the various protective elements, stoppers or
adhesive tapes have been removed
l
Switch on the vacuum pump by following the procedure described
in the chapter “Installation and start-up”
Dismantling and disposal
DANGER
If the vacuum pump has pumped gases that were contaminated
with foreign bodies that are hazardous to health, the oil and
condensate are also contaminated with these foreign bodies.
These foreign bodies can penetrate into pores, openings and other
internal parts of the vacuum pump.
There is a health hazard when dismantling the vacuum pump.
There is also a danger to the environment.
Protective clothing must be worn when dismantling the vacuum
pump.
Prior to shipping, the vacuum pump must imperatively be
decontaminated and the degree of contamination must be
documented in a declaration of decontamination ("Declaration of
Decontamination"), which can be downloaded from
www.buschvacuum.com.
Dispose of the used oil and condensate according to applicable
environmental protection regulations.
Overhaul
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