Depending on the runtime of the motor, the
actuator stem and the plug stem retract in the
upper end position. Note the plug stem on the
travel indicator. When the desired travel po-
sition has been reached, turn span adjuster
slowly counter-clockwise until the LED just
begins to disilluminate. The motor then disen-
gages, and the plug stem rests in the final po-
sition.
IMPORTANT
The starting point (zero) for the control valve
always refers to the closing position
(Fig. 11). With reverse operation direction
(e.g., 20 to 4 mA = 0 to 100 % travel, switch
position increasing-decreasing <>), the clos-
ing position assumes a value of 20 mA; the
zero adjuster must then be adjusted to
100 %. Consequently, the final value (4 mA)
is adjusted as described above using the
span adjuster.
10
