M6 SERIES IOM
6th EDITION
ISSUED 12/2014
14
C. Setting The Stops on Spring Return Units (Fail Open)
1. Remove/lockout the air supply to the actuator and it will drive to the open position. Note the position of the
actuator.
2. Apply air to close the actuator. Note the position of the actuator while the air supply is maintained, loosen the
locknut on the open stop and adjust the stop to the correct position desired.
3. Retighten the locknut.
4. Remove/lockout the air supply to the actuator so that it opens, if it is not the correct position repeat items 1-3.
5. Loosen the locknut on the close stop and adjust the travel by the amount desired to give the correct position.
(Clockwise adjustment decreases travel.)
6. Retighten the locknut.
7. Reapply air and check the closed position. If not desired closed position repeat items 1-5.
Closed Limit Stop
Open Limit Stop
Fig. 6.3
The above illustration shows a spring return actuator (FCCW configuration) in the open position and
identifies the opening and closing limit stops.