Flowserve 10 ACCESS I 39 Actuators with DeviceNet Interface - Manual (Page 6)

6 10, 15, 20 ACCESS I 39 Actuators with DeviceNet Interface WCAIM2019
Flow Control Division
Worcester Controls
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 1 on next page). 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. Also, be sure that all gaskets are properly
installed (see figure 2 on next page and actuator exploded
view). Do not apply any grease to gasket, it must be installed
dry. Be sure red plastic plug is installed in plugged port (see
figure 1 on next page) for spring return actuators.
C. Standard Stroke Times
For stroke times of the ACCESS I Series 39 actuator with solenoid
and control block, consult factory. Times will be measured in
seconds and will represent average times under 50% load
conditions with an air supply pressure of 80 psig. Times will be
per stroke for double-acting actuators. For spring-return
actuators, the opening stroke times may be slightly longer; stroke
times for the closing (spring) stroke will be dependent upon the
number of springs used. Cycle times for customer air supply
systems will be dependent upon customer equipment.
D. Manual Operation
In the event of air failure, the ACCESS I Series 39 actuator 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.
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 1 on page 7
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.
MAINTENANCE
CAUTION: The actuator must be isolated both pneumatically and
electrically before any maintenance activity is begun.
Periodic checks should be performed to make certain that all
fasteners remain tight. Care should be taken when tightening the end
cap retaining bolts since these fasteners are METRIC. All other
fasteners are UNIFIED IMPERIAL.
All actuators are supplied with sufficient lubrication for their normal
working life. If required, recommended lubrication for all standard
actuators is a #1 grease.
Depending upon the conditions under which the actuator must work,
such as extended duty, non-compatible operating media or abnormal
operating conditions, periodic replacement of internal seals is
recommended. Repair kits containing all necessary seals can be
obtained through any authorized Worcester/McCANNA distributor.
On spring-return actuators, the springs may need replacement after
extended duty since springs may fatigue and break. SPRINGS
SHOULD ALWAYS BE REPLACED IN COMPLETE SETS. Spring kits are
available through any authorized Worcester/McCANNA distributor
SPARE PARTS
The following are recommended spare parts which should be kept on
hand for Series 39 pneumatic actuators:
Repair Kit(s) - Kits contain all necessary seals, bearings and
instructions.
Spring Kit(s) - For Spring-Return Actuators.
TROUBLESHOOTING
BEFORE DISASSEMBLING ACTUATOR FOR ANY REASON, CONSULT
REBUILDING INSTRUCTIONS CONTAINED IN FOLLOWING SECTION.
A. If actuator does not function, check to ascertain:
1. That valve is free to rotate. This can be done as described
above in Manual Operation.
2. That actuator is the correct size.
3. That speed control screws or exhaust ports are not blocked.
4. That correct voltage is supplied to solenoid.
5. That sufficient air supply is available at inlet to control block.
Inlet pressure to control block should be at least 40 psig for
double-acting, 80 psig for spring-return (unless a reduced