18
Installation
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 hPa.
With rigid pipe connections: Install bellows for attenuation of vibrations in the connec-
tion line.
Connect the fore-vacuum line with small-flange components or threaded hose cou-
plings. 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 connection
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 operating in-
structions.
– Make sure the supply voltage for the backing pump is valid.
WARNING
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.
Fig. 5:
Connecting the backing pump
20 Fore-vacuum
connection
20a Backing pump
20b Backing pump relay box
20.1 Centering ring
20.2 Clamping ring
V
20b
20a
20.2
20.1
20
NOTICE
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.
Connect flexible line elements directly to the turbopump, if necessary.
