SERIES 70 ELECTRIC ACTUATOR
Installation, Operation, and Maintenance Manual
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7.0 ACTUATION
7.1
Manual Operation
The manual override operates similar to a watch adjusting knob. To engage the
manual override, simply pull the handwheel to its outermost position. A yellow stripe
is revealed to visually indicate manual override engagement as shown in Figure 1.
The two handwheel positions, engaged and disengaged, are held in place with the
use of spring plungers. The handwheel remains in position until physically moved.
Yellow Stripe
Figure 1
- Handwheel is engaged, revealing the yellow stripe.
Once the manual override is engaged, rotating the handwheel in the clockwise
direction will rotate the output shaft in the clockwise (close) direction and vice-
versa.
To disengage the manual override, the handwheel needs to be pushed towards the
actuator until the ‘yellow stripe’ is hidden.
CAUTION
A label on the handwheel hub warns users not to exceed a specific ‘rim pull’ force,
for each size of actuator.
If the ‘rim pull’ force is exceeded, the roll pin securing the handwheel onto the
manual override shaft is designed to shear, thus preventing serious internal gearing
damage.
7.2
Remote Operation
CAUTION
1 . Verify that the main electric power supplied to the actuator is in compliance with
the specifications on the actuator label .
2 . Engaging the handwheel before or during the application of a supply voltage
will prevent the actuator motor from operating .
3 . If torque switches are installed in the actuator, an over-torque condition will
prevent the actuator motor from operating in the direction of fault .
