Pfeiffer HiPace 300 Operating Instructions Manual page 17

Connecting the fore-
vacuum side
Recommendation: As backing pump, use a dry-compressing vacuum pump or a
rotary vane pump from the Pfeiffer Vacuum programme. The backing pump must
generate a vacuum pressure of ≤ 5 mbar.
Damage to health due to poisonous gases
Process gases can damage health and contaminate the environment.
 Safely lead away the gas emission from the backing pump!
 Observe all safety recommendations of the gas producer.
20b
Fig. 6: Connecting the backing pump
20 Fore-vacuum connection
20a Backing pump
Design of the fore-vacuum connection regarding sudden twisting of the pump
If the rotor suddenly blocks the connection of high vacuum flanges of types ISO-KF or
ISO-K can lead to twisting despite proper installation.
 Keep masses small, which can be installed directly to the pump.
 First connect flexible line elements directly to the turbopump, if necessary.
 With rigid pipe connections: Install bellows for attenuation of vibrations in the
connection line.
 Connect the fore-vacuum line with small-flange components or threaded hose
couplings. Do not narrow the free cross section of the fore-vacuum flange!
 The backing pump is connected electrically via a relay box.
 Plug in and fix the accessory's control lead to the corresponding accessory con-
nection port on the TC 400.
 Default for the backing pump is "accessory A2".
 Establish the mains supply for the relay box according to the accessory operat-
ing instructions.
– Observe the valid supply voltage of the backing pump.
WARNING
20a
20
V
20.1
20.2
20b Backing pump relay box
20.1 Centering ring
NOTE
Installation
20.2 Clamping ring
17