6.
Manual operation
The actuator may be operated manually for purposes of setting and
commissioning, and in case of motor failure or power failure.
Manual operation is engaged by an internal change-over mechanism.
Engaging manual operation:
.
Lift up change-over lever in the centre of the handwheel to approx. 85°,
while slightly turning the handwheel back and forth until manual operation
engages (figure C).
Manual force is sufficient for operating the change-over
lever. It is not necessary to use an extension. Excessive
force may damage the change-over mechanism.
.
Release change-over lever (should snap back into initial position by spring
action, figure D), if necessary, push it back manually.
Operating the change-over lever while the motor is running
(figure E) can lead to increased wear at the change-over
mechanism.
.
Turn handwheel into desired direction (figure F).
Disengaging manual operation:
Manual operation is automatically disengaged when the motor is started
again. The handwheel does not rotate during motor operation.
10
Multi-turn actuators SAN 07.1 – SAN 25.1/SARN 07.1 – SARN 25.1
for valve automation in nuclear power plants
Operation instructions
Figure D
Figure C
Figure E
Figure F