Maintenance; General Information - BUSCH COBRA NC 0100 B Manuel D'installation Et De Maintenance

Recommendation for the temperature adjustment of the COBRA
NC 0300 B
Running frequency 50 Hz, T
amb
rature < 60 °C
Temperature class
Cooling
i o medium
(inside) (outside)
T4 T4 Water
Water-
T4 T4
Glycol
T3 T3 Water
Water-
T3 T3
Glycol
If a rating is modified at a later date, thereby causing an increase of the
gas temperature; e.g. by the increase of the cooling medium
temperature, the adjustment of the thermostatic valve must be done
accordingly.
WARNING
The adjustment of the thermostatic valve is only admissible in case
of absence of any explosive atmosphere.
After the adjustment, the pump has to run minimum 30 minutes
without any explosive atmosphere inside.

Maintenance

General information

CAUTION
Information on the maintenance of the pump can be found in the
enclosed installation and operating manual of the COBRA NC 0100
¼ 0300 B.
Please also refer to the following remarks and maintenance
prescriptions:
WARNING
After the start-up, the vacuum pump has to be controlled everyday
regarding any noise appearance. In such a case, immediately stop
the pump, see "Troubleshooting".
WARNING
The barrier gas supply of the seal has to be checked every week, if
this is not automatically controlled by a flow meter. The barrier gas
quantity for the sealing systems 1 and 2 should be 2.5 to 3 l/min,
see the Instruction and Operating manual COBRA NC 0100 ¼
0300 B.
WARNING
The inside of the vacuum pump should be regularly controlled
regarding the deposit formation and if so to suppress, e.g. by the
pump flushing. The formation of deposit can provoke some friction
and spark formation in the pump, which has to be imperatively
avoided. Explosion danger!
Control possibility exists at the vacuum pump inlet and outlet. The
use of an endoscope for better control is recommended.
Maintenance
Seite/ Page/ Page 16
-20 °C to +40 °C, Gas entry tempe-
Tempera- Pressure
ture of co- diff. of co- Position of
oling oling me- thermosta-
medium dium p tic valve
Diff.
[°C] [bar]
< 30 3 to 6 0...2
< 20 3 to 6 0...1
< 30 3 to 6 0...4
< 30 3 to 6 0...4
DANGER
Any servicing on the pumps must only be done by specially trained
servicing staff under strict adherence of current and valid safety
regulations. In the event of possible risks from dangerous
substances of any kind, the user of the pump must duly inform and
instruct maintenance staff before any work is carried out.
Before any maintenance work is carried out, any risk to the health
of maintenance personnel that could come from pumped
substances (or any other substances) from both within the pump or
outside, must be removed.
WARNING
The opening of the vacuum pump is only authorized after it is
come to a full stop and in the total absence of any explosive
atmosphere.
WARNING
Bearing exchange - The bearings have to be exchanged every
16'000 running hours, because a bearing breakdown will increase
the explosion danger.
The coupling has to be maintained according to the manufacturer
service prescriptions.
In accordance with the Instructions and Operating Manual of the
COBRA NC 0100 ¼ 0300 B, the following servicing may be carried
out:
l Checking and cleaning of the water cooling pipe-work
l Changing lubrication and cooling oils
l Changing or fill up the cooling liquid (evaporation cooling)
l Checking, cleaning or changing the air filter of the flushing device
l Cleaning the external parts such as fan cover and cooler
Other work such as dismantling or rebuilding jobs as well as repair and
maintenance work may only be carried out by BUSCH customer service
engineers.
WARNING
All cleaning works have to be executed with a humid rag in order
to avoid any electrostatic charge and sparks discharge.
The electrical installation is to check every 4'000 running hours
regarding the function and the damage. This also includes the vacuum
pump control and the potential compensation.