Flowserve 10–40 39 ACCESS M Mounted Limit Switch - Manual (Page 5)

WCAIM2032 10–40 39 ACCESS M Mounted Limit Switch and Solenoid with AS-Interface 5
The unit has two independently adjustable speed control
screws which can be used to adjust the speed of operation for
the opening and/or closing stroke (see Figure 2). If the speed
control screws are too tight, the unit will fail to operate.
NOTE: Speed control screws are shipped from the factory in
the full-open position.
B. Spring-Return with Control Block - Air is supplied to the 1 /
4
"
NPT port on the block. When the solenoid is energized, the
spring-loaded plunger is withdrawn; allowing the supply air to
shift the spring-loaded spool within the block, which opens
the supply path to the center chamber of the actuator. Air
from the end chambers of the actuator is allowed to pass
through the block and exhaust to atmosphere.
When the solenoid is de-energized, the spring-loaded plunger
blocks the flow of air to the spool within the block and the
spring-loaded spool returns to a position which allows air
from the center chamber of the actuator to pass through the
block and exhaust to atmosphere as the actuator is cycled by
the springs in the end chambers of the actuator. The end
chambers are exhausted to atmosphere at all times.
The actuator is fail-safe. That is, it will return to its de-
energized position upon electrical or pneumatic failure.
The unit has one speed control screw, which can be used to
adjust the speed of operation for the closing stroke (on a fail-
closed unit) or opening stroke on a fail-open unit, and one port
plugged with a red plastic plug (see Figure 2 on page 4). If the
speed control screw is too tight, the unit will fail to operate.
Note: Speed control screws are shipped from factory in the
full-open position.
CAUTIONS: If converting a double-acting actuator to a
spring-return actuator or vice-versa, be sure the correct
control block gasket is used (see Figure 1 on page 4 and
Access exploded view).
Be sure red plastic plug is installed in plugged port (Figure 2
on page 4) for spring-return actuators.
C. Manual Operation
In the event of air failure, the Series 39 actuator with Access
unit can be cycled manually. This is accomplished by applying
a wrench to the exposed top shaft of the actuator and turning
it in the desired direction.
a WARNING: Care must be taken to ensure that the
actuator is not operated automatically while manual
operation is being performed.
If a routine cycle check is to be performed on an actuator
with a control block, the actuator can be cycled manually by
shifting the spool valve within the control block. This can be
done by pushing the override button in the control block (See
Figure 2 on page 4 for location of button). Care must be taken
to hold the spool valve in the desired position until the
actuator has cycled. Provided the air supply is still on, the
actuator will cycle to its original position as soon as the
manually applied pressure on the override button is released.
Flow Control Division
Worcester Controls