l
Set the thermometer valve TV to position 4 (closed). Blow
compressed air into the cooling water inlet connection. This
operation removes cooling water from the motor cooling circuit.
Close the valve CWR and set TV to position 0 (open).
Blow compressed air in to the cooling water inlet connection again.
At the end, open valve CWR again.
NOTE
: When the pump has not been in operation for a few days or
when a sticky substance has been sucked, it is possible that the two
screw rotors of the vacuum pump will stick to each other. Open the
plug (PMR) to access the screw rotors. Loosen the rotors 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 “Installation prerequisites” are followed.
l
Open cooling water supply.
l
Make sure that the thermostatically controlled valve (TV) that
regulates the temperature of the cooling water in the cylinder is set
correctly.
–
The water temperature is regulated by adjustment of the valve
from position 0 (cold) to position 4 (warm). The setting must
correspond to local operating conditions.
Use of a higher setting is recommended for the thermostatic valve
to prevent condensation inside the pump.
CAUTION
Changing from position 0 to position 4 or vice versa must take place
in steps. The pump must stabilise after every change in setting.
Never switch directly from position 0 to position 4 or vice versa.
l
Make sure that the cooling water flow in the motor and drive
housing is set correctly.
–
The cooling water flow is factory set on 2,5 l/min and can be
adjusted at the regulating valve CWR. This water circuit is used to
cool the motor and the oil.
When changing the position of the thermostatic valve TV, adjust
the regulating valve CWR to a new setting.
l
Make sure that the nitrogen flow is set correctly (option).
–
The nitrogen flow is factory set to 18 Nl/min and can be adjusted
at the regulating cock DGR.
l
Switch on the vacuum pump.
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.
Maintenance
DANGER
In case the vacuum pump has conveyed gases that have been
contaminated with foreign materials that are dangerous to health,
the oil and condensates will also be contaminated.
These foreign materials can infiltrate the pores, recesses and other
internal spaces of the vacuum pump.
Danger to health when the vacuum pump is dismantled.
Danger to the environment.
Always wear protective clothing when carrying out ma intenance
work.
Before any maintenance work, the inlet and outlet piping as well as
the vacuum pump itself must be flushed with nitrogen.
CAUTION
Only authorised personnel may carry out dismantling work on the
vacuum pump. Before work begins, the operator of the vacuum
pump must fill in a form or a “Declaration Regarding Contamination
of Equipment and Components” that provides information on
possible dangers and appropriate measures.
If this form has not been filled in completely and signed, the
vacuum pump may not be dismantled.
CAUTION
The surface temperature of the vacuum pump can exceed 70°C
when the vacuum pump is in operation.
Risk of burns!
Before starting maintenance work, make sure that the vacuum pump
has been switched off and that it cannot be switched on again
accidentally. Follow the shutdown procedure in the section “Switching
off for maintenance work”:
CAUTION
The oil temperature can reach a value of 100°C!
Risk of burns!
l
Make sure that the oil circuit and the coolant circuit have been
emptied before moving the vacuum pump.
l
Do not use strong solvents for cleaning of labels and stickers on
the pump.
Before pulling off the different connections, make sure that the intake
and exhaust lines of the vacuum pump are ventilated to atmospheric
pressure.
When the maintenance work has been finished, follow the procedure
for restarting after maintenance work.
Maintenance program
NOTE
: The maintenance intervals depend on the operating conditions.
The following intervals are basic values, which can be shortened or
lengthened depending on operating conditions. In especially difficult
operating conditions such as, for example, a very dusty environment
the maintenance intervals must be shortened considerably.
Weekly:
l
Check the oil level and the colour (see “Checking the Oil”)
l
Check the vacuum pump for oil leaks - in case of leaks, have the
vacuum pump repaired (Busch service)
Maintenance
NS 0070-0160 C
Page 12
0870570353 (En)
Содержание COBRA NS 0070-0160 C
Страница 23: ...Note...
