Manual venting (standard design)
1. Ensure that the vacuum system is switched off.
2. Open the black venting screw on the turbopump by one rotation.
3. Wait for the pressure to equalize to atmospheric pressure in the vacuum system.
4. Close the venting screw again.
Vent with the Pfeiffer Vacuum venting valve (accessories)
The Pfeiffer Vacuum venting valve is closed without current. Control is carried out via the electronic
drive unit of the turbopump and the parameter settings of
[P:012]
and
[P:030]
.
In the event of a power failure, the turbopump continues to run on, providing sufficient energy to initiate
a correct venting process. When power is restored, the venting process is interrupted.
Venting speed [P:720]
Venting duration [P:721] Venting duration on power fail
ure
50 % of the nominal rotation speed 3600 s
3600 s
Tbl. 9:
Factory settings for delayed venting with turbopumps
► Switch off the turbopump via the control unit or the remote control.
– The venting process starts automatically.
General notes for rapid venting
Pfeiffer Vacuum recommends performing the rapid venting of larger volumes in 2 stages.
1. Use a Pfeiffer Vacuum venting valve for the turbopump or match the valve cross-section to the
size of the recipient and the maximum flow rate.
2. Vent the vacuum system with a maximum rate of pressure rise of
15 hPa/s
for the duration of 20
seconds.
3. Then vent the system with a second venting valve of any size, e.g. directly on the vacuum cham-
ber.
4. Wait for the pressure to equalize to atmospheric pressure in the vacuum system.
Operation
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