Agilent Technologies Turbo-V 550 Notice De Mode D'emploi page 246

17 Technical Information
Interconnections
PIN
3-8
4-9
Pin 3-8 must be shorted to allow the Turbo-V 550 pump to start if no interlock
NOTE
contact is connected. if, after starting the pump, the interlock contact opens, it
has no effect on the operation and the pump continues to turn.
The following figure shows a typical contact logic input connection
and the related simplified circuit of the controller.
Figure 10
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DESCRIPTION
INTERLOCK optically isolated from the internal circuit, this signal can be used
to delay the starting of the turbopump. requires a permanent closed contact
before starting the turbopump.
SYSTEM OVERRIDE optically isolated from the internal circuit, this signal is
used to stop the pump in emergency condition, requires a closed contact.
When the contact is closed, the turbopump and the interconnected devices are
stopped.
Typical logic input
Turbo-V 550 Controller User Manual / 87-900-873-01 (G)