VICI DVSP User Manual
Page 11
Programming the DVSP is very simple now that the process has been broken into
steps:
1.
Set the switch beside the "1" to the right, for "seconds", and set the
thumbwheel switch to 02.
2.
Set the switch beside the "2" to the left, for "minutes", and set the
thumbwheel switch to 15.
3.
Set the switch beside the "3" to the left, for "minutes", and set the
thumbwheel switch to 19.
4.
Set the switch beside the "4" in the middle, for "tenths of minutes", and set
the thumbwheel switch to 45 (4.5 minutes).
The wiring connections for the demonstration sequence are illustrated in Figure
12. Since V1 uses the DVI (with a built-in two-second relay) it is simply wired to
DVSP relays A and B which correspond to Intervals 1 and 2. (A jumper connects
the Commons.)
Since V2 is switched by a
pair
of solenoid valves, it is important that the current
which activates them is supplied only as long as it takes to switch the valve, even
though the DVSP relay is energized for the entire length of the interval. To provide
this pulsed current and avoid the problems associated with continuously-applied air
pressure, the DVSP features a fifth relay (E) which is activated for two seconds at
the beginning of each interval. When the "hot" leg of each solenoid is run through
relay E, the power is applied to the solenoid only during the initial two seconds of
its interval.
AUTO
RUN
m
x
.1
m
x
.1
m
x
.1
m
x
.1
m
s
m
s
m
s
m
s
POWER
4
3
2
1
Valco Instruments Co. Inc.
Figure 11: DVSP front panel
programmed for the demonstration process
9