Flowserve 10 ACCESS I 39 Actuators with DeviceNet Interface - Manual (Page 5)

WCAIM2019 10, 15, 20 ACCESS I 39 Actuators with DeviceNet Interface 5
Flow Control Division
Worcester Controls
Fail-Closed Fail-Closed
(Inline Operation) (Cross-line, Inverted Operation)
Fail-Open Fail-Open
(Cross-line Operation, or with Inline Coupling) (Inline, Inverted Operation)
NOTE: Wire colors in parentheses are for proxinity sensors only.
For units without switches/sensors, disregard switch/sensor wiring, and also their instructions in Section B.3.
OPERATION
A. Double-Acting 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loaded plunger is withdrawn, allowing the supply air to shift the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 seal within the block and the
spool spring shifts the spool within the block to a position which
opens the supply path to the end chambers of the actuator. Air
from the center chamber of the actuator is allowed to pass
through the block and exhaust to atmosphere.
The actuator is electrically fail-safe. That is, it will return to its de-
energized position upon electrical failure.
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 1 on page 7). 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loaded plunger is withdrawn, allowing the supply air to shift the