Connection Configurations; Connection B - Fore-Vacuum Pump; Connection C - Electrical - Varian Turbo-V 550 Bedienungshandbuch

Connection configurations

Connection B - FORE-VACUUM PUMP

A flange KF 25 NW is available to connect the
Turbo-V550 to the fore-vacuum pump. A hose or
vacuum approved pipe can be used. If a rigid pipe
is used, any vibration generated by the mechanical
pump must be eliminated through the use of bel-
lows.
NOTE
The Turbo-V550 is characterized by its high com-
pression ratio also for oil vapors. When using a
mechanical oil-sealed pump, it is advisable to in-
stall a suitable trap between the turbopump and
the fore-vacuum pump in order to prevent oil
backstreaming.

Connection C - ELECTRICAL

The turbopump is connected to the controller
through an 8-pin connector. Pins B, C and D are
the 3-phase supply to the motor, pins A and F are
connected to the temperature sensor (NTC type,
30 KΩ resistance at 25° C) and pin E is connected
to the pump ground; pins G and H are not con-
nected.
If the temperature sensor is disconnected, the
pump will not start. To prevent damage to the
pump when the temperature exceeds 60° C, the
sensor automatically cuts out the power supply.
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TECHNICAL INFORMATION
87-900-874-01(B)