Rated
Stroke
Calculation
Split Range Required Stroke
15 mm
38 mm
38 mm
30 mm
72 mm
114 mm
15 × 2 = 30mm
38 × 2 = 72mm
38 × 3 = 114mm
1/2
1/2
1/3
22
Model EA91A＆EA90A
Manual Changeover
Switching Mechanism
OUT
SUP
Stopper Screw
A/M Switching
Screw
⑴ Connect wiring in accordance with indi-
cations (+) and (−) of terminal. (Reverse
positioner wiring has already been performed
and adjusted at our factory)
⑵ Make sure that action of reverse positioner
is properly performed by increasing/decreasing
the input signal.
⑶ Perform operating adjustment in accor-
dance with the procedures from Items 6.2
to 6.5, and check with loop test.
※Therefore, when the stroke is greater than 65mm, the
feedback spring (or zero adjustment spring) will be
special specification.
※For details except items described above, contact our
sales office or sales agent in your region.
（10） Calculating Method for Lever Type Positioner(Example)
6.7 Reverse Positioner Adjustment
(Common to Linear Type and
Built-in Cam Type)
6.7.1 In case of Reverse Positioner Specifications
(Adjusted at Our Factory)
Before operating manual switching mechanism,
make sure that the filtered regulator is placed at
the line of supply side of the positioner.(Due to
supply bypass method)
6.8 Manual Switching Mechanism
-A/M Switching (Common to Lin
-ear Type and Built-in Cam Type)
IMPORTANT
If adjusted at our factory, nameplate of
"Reverse Positioner" is stuck at the back
of the terminal cover.
IMPORTANT
Never remove the stopper screw.
IMPORTANT
①If not venting through the filtered
regulator, it might apply excessive
pneumatic pressure to the positioner
or the actuator.
②If not inputting through the filtered
regulator, it might be in danger that
the air pipe of the positioner is
clogged up with foreign matter.
⑴ Zero adjustment spring must be replaced with blue
colored spring. For your inquiry of the spring, please
contact us or our sales agent in your area.
⑵ Connect wiring with (+)and (−) terminals in reverse
of.(Reverse positioner wiring is performed and adjusted)
⑶ Make sure that adjustment for reverse positioner is
performed by increasing/decreasing the input signal.
⑷ Perform operating adjustment in accordance with the
procedures from ltems 6.2 to 6.5, and check with loop
test.
6.7.2 In case of Changing to Reverse Positioner
Specifications at Site.
⑴ Operate the filtered regulator, and set the
supply pressure (SUP) to zero.
⑵ Turn the A/M switching screw to manual "M"
side (clockwise) with minus driver until it stops.
⑶ The air is supplied through the air pipe to
supply side (SUP).
⑷ Operate the filtered regulator, and perform
operation of control valve manually.
⑸ Turn the A/M switching screw to auto "A"
side until it contacts with the stopper screw.
⑹ Operate the filtered regulator, and reset to
original supply pressure.
6.8.1 Switching Procedure
IMPORTANT
The Models EA90A and EA90AC cannot
be compatible with the reverse positioner.
(The positioner does not work even if the
wiring is connected in reverse since
diode is mounted in torque motor.)
