Installation
40 300855170_002_C8 - 08/2021 - © Leybold
3.7 Connect a power failure venting valve or a venting valve
The power failure venting valve (normally open) or venting valve (normally
closed) vents the pump and the fore vacuum line when the pump is switched
off and thus keeps oil vapor from diffusing back from the forevacuum line. A
choke nozzle in the vent port ensures that the pump is not vented too fast.
The max. permissible pressure in the pump must not exceed 1.4 bar (abs.).
Unscrew and remove the locking screw and the gasket from the venting con-
nection of the TURBOVAC.
Screw in the venting valve and the gasket into the venting connection. To
protect the threads, the max. fastening torque is 5 Nm.
If applicable connect the venting gas supply at the valve’s inlet (G1/8“).
When using the pump with purge gas, protect the purge gas supply such
that in the event of a malfunction no overpressure can occur within the
system. The pressure in the pump must not exceed 1400 mbar (0.4 bar
over pressure).
Connect a purge gas or venting valve to the correct flange. Confusing the
venting and purge gas flange can cause shock venting of the pump.
Only for TURBOVAC i
Plug in the corresponding control cable into the accessories connection.
For the electronic drive unit change the venting valve settings to venting
operation (via the interfaces).
Only for TURBOVAC iX
Plug in the corresponding control cable into the accessories connection
X203. Accessory connection X203 is so pre-configured that the venting valve
opens when the start command is revoked and the frequency drops below
999 Hz. At 5 Hz this valve is closed again. This is no power failure venting!
The limits can be changed through parameter 28[2] (upper switching thresh-
CAUTION
NOTICE
Fig. 3.12 Venting and purge gas connections
VENT
Venting connection
G1/8“
PURGE
Purge gas connection
G1/8“
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