2.Zero
・
Span adjusting
This product requires zero
・
span adjustment of output current according to actuator’s
opening (rotating angle).
Please follow steps below.
①
Set actuator’s output opening 0% after adjusting the zero
・
span.
②
Output signal is connected to rise in normal operation(clockwise) when shipped.
To apply the positioner in reverse operation(counter-clockwise), swap terminal
″
A
″
and
″
C
″
in Fig.2.
③
Loosen potentiometer set screws applying power and ensuring output current, then
rotate the potentiometer 10
°～
20
°
away from dead band (see Fig.3) to decide the
start point. Settle the potentiometer with the screws again(Refer
″
Cautions
″！
)
④
Adjust zero
・
span with variable resistor.
Adjust zero point and span alternately repeatedly as they act each other. Since this
variable resistor can be wound endlessly, do not overwind otherwise internal
equipment might be broken. Adjust them ensuring output signal.
Cautions(settling potentiometer)
(1) Output signal dose not go at the dead band of the potentiometer
(2) If set the start point(4mADC) at the border line of resistance portion and the
dead band, malfunction might be occurred.
(3) If output current is 0mADC during opening, the potentiometer is possibly used
across the border between the resistance and the dead band. Follow
③
of section 2
ensuring potentiometer rotating direction.
(4) When the positioner is used in reverse action, adjust the potentiometer fixing
position to avoid interpretation between cam and lead wire of the potentiometer.
Fig2. P.C.board
Ａ
B
C
Ａ
－
2
－
