Manufacturer: Johnson Controls |
|
Description: POSITIONER FOR D-3244
Category: Pneumatic Controls
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.
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.
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.
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
Replaces Part Numbers: D-9502-5, CARD-9502-5