Process Control Connectors

All the beamline gauge controllers have process control relay outputs which will create open or closed circuits depending on gauge pressure readings. The interlock uses the Common and NO (normally open) relay contacts, so that we have a closed circuit (interpreted by the interlock system as "good pressure", i.e. pressure below a set point) only when the power is on the gauge controller and when the pressure is below the set point. Thus, if the cable gets pulled out or power goes off, it will be interpreted as a bad pressure reading.

The pinouts of the process control relays vary with each gauge controller. They are:

GP 271

Granville-Phillips 271 Analog Gauge Controller: 12 pin PC board connector. "Low" relay pinouts:

Pin 12	N.C.
Pin 11	N.O. $\leftarrow$
Pin 10	Common $\leftarrow$

GP 303

Granville-Phillips 303 Digital Gauge Controller: DB15 connector.

Relay 1 pinouts:		Relay 2 pinouts:
Pin 15	N.C.	Pin 13	N.C.
Pin 7	N.O. $\leftarrow$	Pin 5	N.O. $\leftarrow$
Pin 8	Common $\leftarrow$	Pin 6	Common $\leftarrow$

PE DGC III

Perkin-Elmer Digital Gauge Controller III: DB15 connector.

SP1 relay pinouts:
Pin 2	N.C.
Pin 1	N.O. $\leftarrow$
Pin 9	Common $\leftarrow$