Installation, Operation and Maintenance Manual
Control Valves Electric Actuated Type M 21
1) Operation at Abnormally Low Input
The actuator action is factory set to “Stop” at abnormally low input. (When the input signal goes down to DC 1.5mA
or below, the actuator goes to the abnormal low input operation.) For changing the setting, use the DIP switch on
the control PCB. Refer to table below.
Operation at Abnormally Low Input
Operation Switch 1 Switch 2
Stop 1 ON
Exten OFF OFF
Retract ON OFF
1 Whatever setting for switch 1 is disregarded for “Stop” mode.
2) Direct/ Reverse Action
The actuator action is factory set to “Reverse”. For changing setting, use the DIP switch on the PCB. Refer to
table below.
Direct/ Reverse Action
Action Switch 3 Explanation
Direct ON Output stem is retracted with an input decrease.
Reverse OFF Output stem is extended with an input decrease.
3) Adjustment of Full Open/ Full Close Position
While adjusting of full open/ full close position, go to the local calibration mode beforehand.
1. Turn ON the switch 8 in order to put the actuator in the local calibration mode. (The input signal is disregarded.)
2. Turn ON the switch 5 in order to put the actuator in the adjustment mode of the full open position.
3. Adjust the full open position pushing UP/ DOWN control buttons.
4. When the output shaft reaches a desired position, turn OFF the switch 5.
(The position is memorized as the full open position.)
5. Turn ON the switch 6 in order to put the actuator in the adjustment mode of the full close position.
6. Adjust the full close position pushing UP/ DOWN cotrol buttons.
7. When the output shaft reaches a desired position, turn OFF the switch 6.
(The position is memorized as the full close position.)
8. Turn OFF the switch 8 in order to put the actuator in the run mode.
(When turning OFF the switch 8, output shaft moves in accordance with the input signals.)
9. Apply input signals and confirm the full open/ close positions.
(The optimum full close position is where the valve can full close at the input signal 4mA [20mA], and the fluid
begins to leak at the input signal 4.4mA [19.6mA])
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