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D- 9502 Pneumatic Damper Actuator Positioner

Damper and Actuator Manual 268.1

Actuator Literature Section

Product Bulletin D-9502

Issue Date 0985

Code No. LIT-1628399P

D-9502 Pneumatic

Damper Actuator Positioner

The D-9502 Pneumatic Damper

Actuator Positioners are

precision relay devices used to

adjust and maintain damper

actuators in exact positions on

those applications requiring

precise or otherwise special

damper positioning. Refer to

Table 1 for models available.

The basic positioner provides

dynamic stabilization and/or

sequential control of damper

actuators. It is available factory

installed on most D-3000 Series

Damper Actuators. Refer to the

appropriate actuator product

data literature for more details.

On D-3153 Series Actuators, a

special positioner mounting kit

(D-9502-9) is available for

changing basic D-9502

positioner control to two-stage

operation. Refer to Installation

Data D-9502-A.1.

Depending on the size of the

actuator used, up to three

additional actuators may be

controlled by a single

positioner/actuator assembly;

for example, multiple actuators

modulating large or coupled

dampers.

Operation

Feedback from the actuator

shaft (through the positioner

spring and lever arm assembly)

activates the positioner to

compensate for external forces

at the shaft and holds the

actuator at the position dictated

by the controller.

Supply air enters the control

chamber of the relay and is

admitted to the actuator when

the control pressure in the pilot

chamber exceeds the

established starting point. This

pressure causes the actuator

shaft to move. Movement of the

shaft is fed back to the relay

Fig. 1: D-9502 Positioner Installed on D-3153 Series Actuator with

Universal Mounting Bracket

Specifications

Summary of content (4 pages)

PAGE 1
Damper and Actuator Manual 268.1 Actuator Literature Section Product Bulletin D-9502 Issue Date 0985 D-9502 Pneumatic Damper Actuator Positioner The D-9502 Pneumatic Damper Actuator Positioners are precision relay devices used to adjust and maintain damper actuators in exact positions on those applications requiring precise or otherwise special damper positioning. Refer to Table 1 for models available. The basic positioner provides dynamic stabilization and/or sequential control of damper actuators.
PAGE 2
through the positioner spring and lever arm to impose a balancing force against the control pressure. When all forces are in balance, the positioner will not allow supply air to pass through to the actuator. The actuator will establish a position proportional to the value of the pressure from the controller. Any change in shaft position will inbalance the relay, causing air pressure in the actuator to increase or be exhausted to reestablish a balance at the desired shaft position.
PAGE 3
Starting Point The starting point is the point at which the actuator begins to stroke. It is adjustable form 2 to 12 PSIG (14 to 84 kPa) using the starting point adjusting screw located under the cover (see Fig. 3). Turning the screw counterclockwise will increase the starting point and clockwise will decrease the starting point. Note: The sum of the starting point pressure and the operating span must not exceed the supply air pressure to the positioner.
PAGE 4
Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53202 4 D-9502 Product Bulletin FAN 268.1 Damper and Actuator Manual Revision Date 0985 Printed in U.S.A.