5Methods
Operation Manual 97
The internal valve drivers
Valve drivers 1 through 4, 9, and 10 are usually used to control pneumatically operated valves
mounted in the valve box. The wiring for these appears at a set of connectors inside the right
cover of the GC.
Pneumatically driven valves are controlled by solenoids mounted near the connectors that
control the flow of air to the valve actuators.
There is no direct relationship between the location of a valve in the valve box and the driver
that controls it. This depends on how the solenoids are wired and the actuators are plumbed.
Manual valves must be switched by hand, and are heated or unheated.
The external valve drivers
Valve drivers 5 and 6 control a current that may be used to drive a relay or other low-power
device. Valve drivers 7 and 8 switch a current from an external source. Electrical details are in
Table 10.
These drivers, particularly Valve 7 and 8, may be used to control a motor driven multiposition
valve for stream selection.
All four of these drivers appear on the External Event connector on the back of the GC.
5 and 6 Current source 24 VDC 100 mA Relays and low-power
devices
7 and 8 Contact closure 48 VDC or 48 VAC RMS Control an external
current source
Table 10 Valve drivers (continued)
Valve number Type Volts Power or current Use
Internal valve drivers
(1 through 4, 9, 10)
Interface
Run table
Clock table
or
or
Connector V1
Connector V2
Connector V3
Connector V4
Connector V9
Connector V10
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