Agilent Technologies TriScroll 600 Série Manuel D'installation Et D'opération page 48

Overview
The status of the VPI Valve is controlled by the TriScroll
motor internal thermal switch and its electrical supply.
The VPI Valve opens when the pump is running and
closes when it is stopped. It will also close when the
TriScroll motor thermal overload protection switch shuts
down the pump.
CAUTION
To prevent damage to the VPI Valve, it
must be installed by a qualified electri-
cian and only as specified below.
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TriScroll 600 Series Vacuum Pump