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7 Process Control Module
64
Series 330 Vacuum Gauge Controller
Instruction Manual - 330004 - Rev. 02
4.
With the Process Control Module connector disconnected from the controller and power
disconnected, connect the process control cable to the devices to be controlled.
5.
Ensure that all devices are under manual control before connecting to the Process Control
Module.
6.
Attach a copy of the process control circuit diagram to this manual for future reference and
troubleshooting.
The process control connector is embossed with letters identifying each pin. Figure 7-1 shows the
letters designating the pins assigned to each channel. Figure 7-2 illustrates the process control
connector on the rear of the module (PC Board).
7.3 Process Control Operation
7.3.1 Setpoint Display and Adjustment
Setpoints are stored in non-volatile memory, and are specified by a 2-digit mantissa and a 1-digit
exponent. They can be set anywhere in the range 1 x 10
-12
to 9 x 10
+5
. This allows for the entire
pressure range of all supported transducer types and systems of units. The setpoint is displayed in
scientific notation.
The setpoint is compared directly to the display data, so units of measure are implicit. Changing the
units switch on the gauge control modules will not change the stored setpoints. They must be
re-programmed in the new system of units.
If a setpoint is set to "above atmosphere", the relay will always be activated (unless its polarity is
reversed, see Section 7.3.3), except during overflow conditions that occur, e.g. when a Convectron
gauge is disconnected. If it is desired that a process control be held in one state, the manual
override switch should be used. If the setpoint is adjusted below 1 x 10
-12
to 0, it will always be
deactivated (unless polarity is reversed).
Figure 7-1
Process Control Pin Assignments/Connector
Summary of Contents for Series 330
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