VICI EUT Universal Electric Actuator - Manual (Page 23)


Using the Offset Feature
This feature makes it possible to control more than one actuator without increasing the
number of BCD or serial input lines. The actuator’s SO value can be set from “1” to “96”,
minus the current NP value (the number of positions the actuator is set to index). Once
an SO value is set, that value is the first (or lowest) position an actuator will recognize.
The factory SO setting is “1”, so an actuator with an NP value of 10 responds to move
commands for positions “1” to “10”. If the SO value is changed to “10”, the actuator will
respond only to move commands for positions “10” through “19”. For any setting of SO
and NP, the lowest valid position will be the SO value and the highest valid position will
be the SO value plus the NP value minus 1; i.e., the actuator will respond to commands for
position SO through position {SO + NP - 1}.
The examples below describe a system that will step sequentially from 1 through 31
with a single instruction. However, note that when positions are selected in a random
sequence, position 16 must always be requested before any positions higher than 16 are
selected. Figure 12 helps illustrate this: since both actuators respond to a command
to go to position 16, stream 16 will flow through valve 1/port 1, out the common port
of valve 2, into valve 1/port 16, and out of the common port of valve 1. Thereafter, any
stream select command that is above 16 will move only valve 2; when a move command
for a position less than 16 is given, valve 1 will move and cut off all flow from valve 2.
With BCD Control
Here is how this can be feature can be used to set up a 31-stream stream selection system
using six dedicated BCD lines and two 16-position valves and actuators. Refer to “Using
the Manual Remote to Configure the Actuator” on page 3 as required.
1. Use the manual remote to enable the auto-latching feature on both actuators. This
eliminates the need for a data latch signal.
2. Use the manual remote to assign the
second actuator an offset value of “16”,
giving it a valid position range of 16 to
31.
3. Use a piece of tubing to connect port
16 of the first valve (on the actuator still
carrying the factory-default offset valve
of “1”) to the common port of the valve
on the second actuator (which now has
an offset value of “16”).
4. Connect streams 1 through 15 to
ports 1 through 15 on the first valve,
and streams 16 through 31 to ports 1
through 15 on the second valve.
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Figure 12: Using the Offset feature