Flowserve Pulsair III Digital - Manual (Page 7)

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Worcester Controls Pulsair III Digital Electronic Positioner FCD WCAIM2056-00 - 08/04
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13
Worcester Controls Pulsair III Digital Electronic Positioner FCD WCAIM2056-00 - 08/04
The PULSAIR III Z positioner has an ISO F05 footprint, A. The holes are used to attach it
to the mounting bracket B, which is suitable for most types of linear actuators.
The spindle adapter C can be changed to suit the actuator in question, as previously
explained in this section.
For data for air and electrical connections, see Technical Data section.
Single-Action Positioner (Direct Function)
Actuator with Fail/Close Spring
When the control signal increases, the pressure C+ to the actuator is increased. The
valve stem moves upward and rotates the positioner spindle counterclockwise. When
the control signal drops to zero, C+ is vented and the valve closes.
C–
S
C+
C–
S
C+
Actuator with Fail/Open Spring
When the control signal increases, the pressure C+ to the actuator is decreased. The
springs press the valve stem upward and the positioner spindle rotates counterclock-
wise. When the control signal drops to zero, C+ is vented and the valve opens.
Connections
Air
Port S Supply air
Port C+ Connection to actuator
Port C- Connection to actuator (only for
double-action)
C– S C+
Must be plugged
when converting
to single-action
function.
Electrical Connection
See Electrical Connections section.
Dimensions
Air connections: ¼ " NPT or G ¼ "
Electrical connection: ½ " NPT or M20 x 1.5
Loctite 577 or equivalent is recommended
as a sealant.
For data for air and electrical connections,
see Technical Data section.
A
B
C