Masoneilan 51/52/53 Series Cylinder Actuator | 15
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Switching from Manual Operation to Auto Operation Mode
1. Remove the pneumatic pressure to de-energize actuator.
2. Set the positioner input signal to the current valve position. Using the handwheel move actuator to the
de-energized position.
3. Rotate the Gear Box Cover (38) in the counter clockwise direction while holding down the MANU button until the
AUTO button releases.
Sudden valve movement may occur if this operation is not performed.
Ensure that the AUTO button is fully released and the Gearbox Cover (38) is firmly locked at the
auto position (no rotation).Failure of the automatic operation can occur.
