SVI-II Instruc Man.book - Fagerberg
SVI-II Instruc Man.book - Fagerberg
SVI-II Instruc Man.book - Fagerberg
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Masoneilan Dresser<br />
<strong>SVI</strong> <strong>II</strong> AP <strong>Instruc</strong>tion <strong>Man</strong>ual<br />
Table 7 Double Acting Positioner ATO⁄ATC Settings for<br />
Reciprocating Valves<br />
Actuator Style<br />
Required<br />
Position on<br />
Loss of Input<br />
Current<br />
Connection<br />
to Output 1<br />
Action of<br />
Positioner<br />
Notes<br />
Piston without spring Closed To retract ATO Requires backup air supply or<br />
reserve tank to failsafe the valve<br />
Piston without spring Open To extend ATC Requires backup air supply or<br />
reserve tank to failsafe the valve<br />
Piston with spring to<br />
extend (ATO)<br />
Piston with spring to<br />
retract ATC)<br />
Closed To retract ATO<br />
Open To extend ATC<br />
* Assumes that valve closes, down seating, when the actuator extends. The terminology is<br />
reversed for an up-seating valve.<br />
Connecting the Air Supply<br />
After the tubing is installed, use the following procedure to connect the air<br />
supply.<br />
1. Use a supply of clean, dry compressed air to the filter regulator.<br />
2. Turn on the air supply.<br />
3. Adjust the filter regulator.<br />
4. Supply pressure must be 5 psi - 10 psi (.345 bar - .69 bar)<br />
(34.485 - 68.97 kPa) greater than the spring range of the actuator<br />
but may not exceed the rated actuator pressure. Refer to the valve<br />
or actuator instruction manual.<br />
Wiring the<br />
<strong>SVI</strong> <strong>II</strong> AP<br />
The procedure below outlines wiring the <strong>SVI</strong> <strong>II</strong> AP.<br />
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