Checking the direct cooling
The flow of the cooling water is checked by the flow switch FS 2. The
flowmeter must be connected in such a way that switching-on leads to
an alarm and stopping of the vacuum pump when the flow drops be-
low 9 l/min.
Checking the nitrogen supply
The flow of the nitrogen is checked by the flowmeter FME. The flow-
meter must be connected in such a way that switching-on leads to an
alarm. The alarm limit can be adjusted depending the type of process.
Saving the operating parameters
As soon as the vacuum pump is working under normal conditions after
being switched on:
l
Measure the working current of the DP and MB motors and save
them as reference values for all future maintenance and repair
work
Recommendations on operation
Application
WARNING
The vacuum pump is designed for use under the conditions
specified here.
If these conditions are not met, there is a risk of damage to or total
destruction of the vacuum pump and its components!
The vacuum pump may only be switched on under the specified
conditions.
The COBRA DS vacuum pumps are designed for use in the field of mi-
croelectronics and similar industries.
They can be used to suck gases and gas mixtures.
WARNING
When using toxic, inflammable and/or explosive gases, make sure
that the system corresponds in design to applicable local and
national safety regulations and that all applicable safety measures
are followed.
All product-specific safety regulations must be observed.
Solid particles must not get into the vacuum pump. Procedural errors
can result in the pump drawing in a certain quantity of liquid. If the
pump has drawn in liquid, a short drying time is necessary at the end
of the procedure.
The allowed maximum inlet gas temperature depends on the inlet pres-
sure and the type of gas: the lower the inlet pressure (Pa), the higher
the drawn gas temperature (TGas) can be.
The following indicative values for air can be considered:
– Pa > 50 mbar, TGas < 80°C
– Pa < 50 mbar, TGas < 200°C
The vacuum pump is intended for use in a potentially non-explosive
environment.
Max. permissible number of startings per hour: 6.
As far as temperature is concerned, the pump is suitable for continuous
duty at any pressure between atmosphere and ultimate pressure.
The vacuum pump is tight down to ultimate pressure.
CAUTION
The surface temperature of the vacuum pump can exceed 50 °C
when the vacuum pump is in operation.
Danger of burns!
The vacuum pump may not be touched when it is in operation. If
touching the pump is unavoidable, wait until the surface
temperature has cooled down or wear protective gloves.
CAUTION
The intensity of the noise of the vacuum pump is higher within a
certain area of the pump.
Risk of hearing damage.
Users must wear ear protection when spending a longer period of
time in the vicinity of a non-insulated vacuum pump.
CAUTION
The COBRA DS vacuum pumps can be delivered without oil.
Operation without oil will result in damage to the vacuum pump!
The vacuum pump must remain in a horizontal position when it has
been filled with oil.
CAUTION
The COBRA DS vacuum pumps can be delivered without cooling
liquid.
Operation without cooling liquid will result in damage to the
vacuum pump!
CAUTION
The cooling water flow, which is checked by the flow switch FS 2,
must be at least 10 l/min.
l
Make sure that all caps, safeguards and similar covers are mounted
l
Make sure that the safeguards are switched on
l
Make sure that the inlet and outlet for the cooling air are not
covered or closed and that the flow of cooling air is not impaired in
any way
l
Make sure that the system does not leak. Leakages of dangerous
substances must be prevented
l
Make sure that the “Necessary installation instructions” are
followed and especially that adequate cooling is ensured
The following must be noted when the pump is shut down for a longer
period of time:
CAUTION
If there is a risk of frost, all the cooling water must be drained out of
the vacuum pump if the pump is shut down for a longer period of
time!
–
Drain the cooling liquid
u
Unscrew the filler cap for the cooling liquid
u
Drain the cooling liquid completely
u
Screw on the filler cap for the cooling liquid again
u
Collect the cooling liquid and recycle it or dispose of it
according to local or national regulations
DS 3010 E
Installation and start-up
0870771509 (En)
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