Johnson Controls MP8000 Series Manuale utente

Installation Instructions V-9502-95

Issue Date February 10, 2003

Part No. 14-1161-68, Rev. A www.johnsoncontrols.com

MP8000 Series Actuated Valves with

V-9502-95 Pneumatic Valve Actuator Positioner

Application

The V-9502-95 Pneumatic Valve Actuator Positioner is

a precision relay device designed to operate a

Johnson Controls MP8000 Series Valve Actuator in

applications requiring stable, accurate control. The

V-9502-95 provides maximum positioning power to

resist external forces which might otherwise overcome

the positioning power of the valve actuator. Adjustable

operating span and starting point also make the

V-9502-95 an ideal choice for valve sequencing

applications.

The V-9502-95 Positioner is mounted to the

MP8000 Series Actuator using an MP8000-6002

Positioner Mounting Kit (ordered separately). This

mounting kit contains six color-coded springs and all of

the necessary mounting hardware (as outlined in

Table 1).

Installation

Table 1: Contents of MP8000-6002 Positioner

Mounting Kit

Quantity Description

2Yoke Bushings

1Connector Bracket

1Connector Arm

1Yellow Spring (5/16 in. Stroke)

1Blue Spring (1/2 in. Stroke)

1White Spring (3/4 in. Stroke)

1Gray Spring (1 in. Stroke)

1Green Spring (1-1/4 in. Stroke)

1Red Spring (1-1/2 in. Stroke)

1Phillips-Head, Taptite Screw,

No. 8-32 x 1-1/4 in. (32 mm) Long

1Phillips-Head, Taptite Screw,

No. 8-32 x 5/8 in. (16 mm) Long

2Phillips-Head, Taptite Screws,

No. 6-32 x 1/4 in. (6 mm) Long

112 in. (305 mm) Length of

Black Plastic Tubing

2MP8000 Series Actuated Valves with V-9502-95 Pneumatic Valve Actuator Positioner Installation Instructions

Mounting

Positioner

Cover

Actuator

Stem Connector

Color-Coded

Spring

Cover

Screw

Positioner

Operating Span

Lever Arm

No. 8-32 x 1-1/4 in. (32 mm)

Phillips-Head Taptite Screw Actuator

Yoke

Upper

Jam Nut

Yoke Bushings

(Two Locations)

Connector

Bracket

No. 6-32 x 1/4 in. (6 mm)

Phillips-Head Taptite Screws

(Two Locations)

Yoke Bushings

(Two Locations)

Connector

Arm

No. 8-32 x 5/8 in. (16 mm)

Phillips-Head Taptite Screw

Figure 1: Mounting the V-9502-95 Pneumatic Valve Actuator Positioner

Pilot

Output Hypodermic

Needle Test Point

Output

Supply

Figure 2: V-9502-95 Port Identification

MP8000 Series Actuated Valves with V-9502-95 Pneumatic Valve Actuator Positioner Installation Instructions 3

Refer to Figures 1 and 2, and mount the V-9502-95

Pneumatic Valve Actuator Positioner to an

MP8000 Series Valve Actuator using the

MP8000-6002 Positioner Mounting Kit as follows:

1. Disconnect the supply air to the MP8000 Series

Actuator.

2. Loosen the cover screw on the V-9502-95

Positioner and remove the cover.

3. Locate the side of the actuator yoke that has two

circular holes.

4. Insert the two yoke bushings into the circular

holes from the inside of the actuator yoke.

5. Secure the V-9502-95 Positioner to the side of

the actuator yoke using the two No. 8-32 taptite

screws and two yoke bushings.

Note: Be certain to orient the V-9502-95 Positioner

so that the 5/8 in. (16 mm) taptite screw is closest to

the MP8000 Series Actuator, and the 1-1/4 in. (32 mm)

taptite screw is closest to the valve body.

6. Secure the connector arm to the connector

bracket using the two No. 6-32 x 1/4 in. (6 mm)

taptite screws.

7. Install the connector arm and connector bracket

assembly onto the valve stem, between the

actuator stem connector and the upper jam nut.

Note: The connector arm should be positioned

below and parallel to the positioner operating span

lever arm.

8. Select the appropriate color-coded spring for the

required valve stroke. Refer to Table 1 for the

color-coded stroke designations.

9. Install one end of the spring into the positioner

operating span lever arm. Initially, install the

spring into the seventh hole on the positioner

operating span lever arm. This hole represents an

operating span of approximately 4 psi (28 kPa).

Note: The hole closest to the V-9502-95 Positioner

represents the first hole in the series.

10. Install the other end of the color-coded spring into

the appropriate hole in the connector arm that

allows the spring to be positioned parallel to the

V-9502-95 Positioner body.

11. Loosen the two No. 6-32 taptite screws that

secure the connector arm to the connector

bracket, and reposition the connector arm until

the color-coded spring is just taut but not

stretched.

12. Tighten the two No. 6-32 taptite screws to secure

the connector arm to the connector bracket.

13. Connect the pneumatic input signal to the Pilot P

port of the V-9502-95 Positioner.

14. Use the 12 in. (305 mm) length of black plastic

tubing included in the MP8000-6002 Kit to

connect the Output Oport of the V-9502-95

Positioner to the input of the MP8000 Series

Actuator.

15. Connect a nominal 20 psig (138 kPa) supply

pressure to the Supply Sport of the V-9502-95

Positioner.

16. Commission the V-9502-95 Positioner as outlined

in the Setup and Adjustments section. If the

V-9502-95 Positioner will be commissioned at a

later time, re-install the positioner cover and

tighten the cover screw.

Setup and Adjustments

3 psi (21 kPa)

Span

Operating

Span

Selection Positioner

Operating

Span

Lever Arm

13 psi (90 kPa)

Span

Starting Point

Adjusting Screw

Figure 3: Setting Up the

V-9502-95 Positioner for Operation

The following procedure is a typical example of how a

V-9502-95 Pneumatic Valve Actuator Positioner is

used to adjust the operating spring range and change

the operating span of an MP8000 Series actuated

valve assembly.

Assume that the MP8000 Series Actuator has an

operating spring range of 4 to 8 psig (28 to 55 kPa)

resulting in an operating span of 4 psi (28 kPa), and

that it is desirable to obtain an operating spring range

of 3 to 8 psig (21 to 55 kPa) resulting in an operating

span of 5 psi (34 kPa).

4MP8000 Series Actuated Valves with V-9502-95 Pneumatic Valve Actuator Positioner Installation Instructions

To make the change, refer to Figure 3 and proceed as

follows:

1. Connect a nominal 20 psig (138 kPa) supply

pressure to the Supply Sport of the V-9502-95

Positioner.

2. Install one end of the color-coded spring into the

hole in the positioner operating span lever arm

that corresponds to a 5 psi (34 kPa) operating

span.

Note: The ninth hole on the positioner operating

span lever arm represents an operating span of

approximately 5 psi (34 kPa). The hole closest to the

V-9502-95 Positioner represents the first hole in the

series.

3. Reposition the other end of the color-coded

spring so that the spring is parallel to the

V-9502-95 Positioner body.

4. Connect a 3 psig (21 kPa) pneumatic input signal

to the Pilot Pport of the V-9502-95 Positioner.

5. If the V-9502-95 Positioner cover is not already

removed, loosen the cover screw and remove the

cover.

6. Turn the starting point adjusting screw clockwise

until the actuator just begins to stroke. An output

pressure reading can be taken either by using a

pressure gauge in the V-9502-95 Positioner

output line, or at the hypodermic needle test point

on the positioner body.

7. Increase the pneumatic input signal to 8 psig

(55 kPa). At this point, the valve should be fully

stroked.

Note: In some instances, turning the starting point

adjusting screw will affect the operating span of the

actuator and valve assembly. If the operating span is

affected, install the color-coded spring into a different

hole on the positioner operating span lever arm and

repeat Steps 3 through 7.

If the spring is re-installed into a top hole on the

positioner operating span lever arm, the connector arm

may need to be repositioned to ensure that the

color-coded spring is not stretched beyond just taut.

Refer to Step 11 in the Mounting section for more

details.

8. Re-install the V-9502-95 Positioner cover and

tighten the cover screw. The V-9502-95

Positioner is now ready to position the

MP8000 Series Actuator over an operating spring

range of 3 to 8 psig (21 to 55 kPa).

Controls Group

507 E. Michigan Street

P.O. Box 423 Published in U.S.A.

Milwaukee, WI 53201 www.johnsoncontrols.com

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