The allowed maximum inlet gas temperature depends on the inlet
pressure 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
–
Drain the cooling water
u
Pull off the connections for the inlet and outlet of the cooling
water
u
Drain the cooling water completely
u
If necessary, drain the cooling water with the help of
compressed air to prevent any risk of frost or corrosion
NOTE
: When the pump has not been in operation for a few days or
when a sticky substance has been drawn in, it is possible that the two
screw rotors of the NS (DP) vacuum pump will stick to each other.
Screw open the access cover to the screw rotors. Loosen the rotors
from each other with the help of an Allan key by turning them in
clockwise direction by hand.
Switching the vacuum pump on/ off
First start-up of the system
l
Make sure that the “Necessary installation instructions” are
followed
If the system is equipped with a solenoid gate valve (customer option)
in the cooling water circuit:
u
Open the solenoid gate valve
l
Make sure that the cooling water flow is set correctly
–
The cooling water flow is factory set on 10 Nl/min and can be
adjusted at the regulating valve CWV. This water circuit is used to
cool the motor of the DP and MB vacuum pumps.
l
Make sure that the nitrogen flow is set correctly
–
Nitrogen flow injected in the middle hole (8) is preset at 40 Nl/min
and can be adjusted with valve DGR 2. Nitrogen flow injected in
the hole on cylinder end-plate side (9) is preset at 20 Nl/min and
can be adjusted with valve DGR 1.
l
Switch on the vacuum pump
l
Make sure that the system does not leak
If the system is equipped with a solenoid gate valve at the intake:
u
Open the solenoid gate valve
Switching the system off
If the system is equipped with a solenoid gate valve at the intake:
u
Close the solenoid gate valve
l
Switch off the vacuum pump
l
Shut off the nitrogen supply
l
Shut off the cooling water supply
If the system is equipped with a solenoid gate valve (customer option)
in the cooling water circuit:
u
Close the solenoid gate valve
l
Make sure that the system is electrically isolated
COBRA DS 2610 E
Installation and start-up
0870772455 (En)
Page
15
Содержание COBRA DS 2610 E
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