VICI DVSP - Manual (Page 8)

2.3 Valco Digital Valve Interface (DVI)
Two intervals are required with the DVI: one to signal it to
move the valve to the inject position, and one to signal it
to return to the load position. The steps described below
are illustrated in Figure 7.
1. Connect the air actuator to the DVI as described in
the DVI literature.
2. Locate the blue, black, and red wires in the interface
cable supplied with the DVI.
3. Connect the blue (INJECT) wire to the NO terminal
of the appropriate relay for the desired interval.
4. Connect the black (LOAD) wire to the NO terminal
of the relay corresponding to the interval where
sample is to be loaded.
5. Connect the red (GRND) wire to the Common of
one of the NOs used in Steps 3 and 4, and use a
jumper to connect it to the Common of the other
NO.
In routine operation the DVSP will control the
switching of the valves, so manual control through
the DVI will not be an issue. However, it is possible
to allow the option of manually overriding the posi-
tioning of valves switched by the DVI. To do this, the
DVSP signal must be removed from the DVI remote
cable by routing the DVI common (RED) through the
pulsed relay, E. The signal from the DVSP is ap-
plied for only two seconds and then removed, per-
mitting subsequent manual valve positioning with
the switch on the front of the DVI.
DIGITAL VALVE
INTERFACE
BLUE WIRE
RED WIRE
BLACK WIRE
Figure 7: Valco Digital Valve Interface
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