ABB AV1 Operating Instructions Manual page 54

OPERATING PROCEDURES
EQUALIZING AND AIR SUPPLY SHUTOFF VALVE
5 - 2
2. If the manual operator does not lock the actuator in position:
a. The piston must be positioned from prior knowledge of the
actuator position versus signal or the actuator may jump when
transferred to automatic.
b. Push the valve handle in and turn it to the AUTO position.
3. If the manual operator locks the actuator in position:
a. Depress the valve handle and turn it to the AUTO position.
The actuator will oppose the manual operator if the drive posi-
tion and input signal do not correspond.
b. Manually operate the actuator until the load on the man-
ual operator decreases. If the output pressure gages are
installed on the positioner, the gage readings should equalize.
NOTE: If, in Step 3, it is desired that the drive stay in its initial
position, the input signal must be adjusted to correspond with
the drive position as indicated by the load on the manual opera-
tor, output pressure gages or prior knowledge of position versus
input signal.