–
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 compres-
sed 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 sucked, it is possible that the two
scroll rotors of the NS vacuum pump will stick to each other. Screw
open the access cover to the scroll 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 follo-
wed
If the system is equipped with a solenoid gate valve at the intake:
l
Open the solenoid gate valve
l
Make sure that the cooling water flow is set correctly with valves
TV and CWR 1
–
The thermostatic valve TV is preset on position 4.5 at works. The
position 1 of the valve corresponds to around 50°C minimum and
the position 5 is approximately 90°C maximum. We recommend to
use a high valve setting to prevent resublimation in the pump
l
Do not exceed the position 5 of the thermostatic valve. If you
change the position of the thermostatic valve, adjust the regulating
valve CWR 1.
–
The cooling water flow is factory set on 2 l/min and can be
adjusted at the regulating valve CWR 1. This water circuit is used
to cool the motor of the NS pump. It cools also the cylinder and
cylinder endplate B-side when temperature of cooling liquid is
above 50°C.
l
Make sure that the nitrogen flow is set correctly
–
Nitrogen flow injected in the middle hole (8) is preset at 2 l/min
and can be adjusted with valve DGR 1. Nitrogen flow injected in
the hole on cylinder endplate side (9) is preset at 10 l/min and can
be adjusted with valve DGR 2.
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 in the cooling
water circuit:
u
Close the solenoid gate valve
l
Make sure that the system is currentless
Maintenance
DANGER
In case the vacuum pump has conveyed gases that have been con-
taminated 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 maintenance
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
Before maintenance work is started, a safety area of at least 610
[mm] around the machine must be set up.
CAUTION
The surface temperature of the vacuum pump can exceed 50°C
when the vacuum pump is in operation.
Danger 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 “Lock Out/
Tag Out procedure”:
–
stop the pump with the remote control (press on STOP button du-
ring 10s)
–
press on emergency stop button
–
switch off the main disconnect switch
–
switch off the customer’s power supply
–
switch off the water and nitrogen quick connections (inlet first,
then outlet)
–
put the label or warning board “Maintenance processing” on or
next to the pump
CAUTION
The oil temperature can reach a value of 100°C!
The cooling liquid temperature can reach the value of 100°C!
Danger of burns!
l
Make sure that the oil circuit and the coolant circuit have been
emptied before moving the vacuum pump
l
Make sure that there are no cleaning tools in the pump anymore
according to local and national regulations
Maintenance
DS 0080-2000 G
Page 18
0870772712 (En)
