VICI Valve actuators: Microelectric Two position - Manual (Page 3)

3
Mounting
The actuator should be oriented so that any potential leakage of liquid
from the valve or fittings flows away from rather than into the actuator.
(below) Figure 2 provides the mounting dimensions for the stepper mo-
tor/gearbox assembly.
3.4" for EH
4.4" for ET
2.2"
.7"
1.95"
1.375"
.9"
.973"
1"
1" .75"
3.24"
2.7"
3.1"
3.9"
CONTROL MODULE 8-32
MOUNTING HOLES*
SERIAL
NUMBER
TAG
The length of the 8-32 screws used for panel
mounting is not critical, as long as they extend
at least 1/4" into the actuator casting.
Figure 2
Digital I/O Cable
Pin # Signal Description
1 Ground
2 +5 VDC
3 Position A output
4 Position B output
5 Position A input
6 Position B input
7 Position A relay contact output
8 Position A relay contact output
9 Position B relay contact output
10 Position B relay contact output
OK
OK
Initialization
Any time a valve is removed and reinstalled, the actuator must be initialized by following these steps:
1. Cycle the actuator twice with no valve, or with either end of the motor driver output cable unplugged.
2. Plug the cable back in, or put the valve back in the clamp ring. Orient the valve as desired and tighten
the clamp screw.
For the next few cycles the actuator will move at half its normal speed while it looks for the valve stops.
Once it determines the proper stroke, the actuator will return to normal speed. If you don’t hear a
change in speed, make sure that the clamp screw is tight.
Digital Control of the Actuator
Digital Communication Protocol
Pins 1 and 2 provide ground and +5 volt outputs, respectively; pins 3
and 4 are TTL outputs for Position A and Position B, and are considered
asserted at 0 volts and deasserted at 5 volts. (This is sometimes re-
ferred to as “negative true logic”.) Pins 5 and 6 are digital inputs for
switching to Position A and Position B. They can be driven either by 5 volt
TTL/CMOS logic or by contact closure to ground (Pin 1). Isolated con-
tact closure outputs are available at Pins 7 and 8 for Position A and Pins
9 and 10 for Position B. If there is a positioning error due to valve stick-
ing, clamp ring slippage, etc., the output is set to “0” (all lines high for a
negative true output).
Input Modes
Two input mode options are provided to expand the control flexibility of the actuator.
Mode 1
In mode 1 (default) the digital inputs are set to be compatible with the standard Valco AC actuator.
Asserting input pin 5 causes the actuator to go to Position A, and asserting input pin 6 sends it to