Installation, Operation and Maintenance Manual
Control Valves Electric Actuated Type M 20
4) Adjustment of Seal Spring
Adjust the zero/ span at first, the seal spring next, and the sensibility finally.
In the full closed position, the seal pressure is adjusted by pushing the output shaft in about 1mm when 4mA [20mA]
given with the volume of the zero.
Type Spring Pushing Volume Seal Pressure
MSP6-󲱖4
(for nominal size 15mm (1/2”)) 1mm 120kgf
MSP6-󲱖6
(for nominal size 25mm (1”)) 1mm 180kgf
5) Adjustment of Sensibility (Adjustment of DZ Volume)
Adjust the zero/ span at first, the seal spring next, and the sensibility finally.
Change the input signal, and if the motor keeps turning over (hunting) and does not stop, turn the DZ volume right
(clockwise) to make the span bigger.
Nominal size 50, 80, 100mm (2”, 3”, 4”)
In this explanation, while the output shaft reaches the most lower limit (by inputing signal of 4mA) is called Open type
operations. For the shut type operation, adjust the signal value found in [ ] mark. The function of switches and
indication lights are explained below.
SW1󲽛8
Power: Power LED (Green light turns on when applied.)
INPUT: Input LED (Green light turns on when applied.)
ALARM: Alarm LED (Red light turns on with alarm)
UP: UP Control Button
DOWN: Down Control Button
SW1: Operation at abnormally Low Input
SW2: Operation at abnormally Low Input
SW3: Direct/ Reverse Action
SW4: It is not used.
SW5: Full Open Position Set
SW6: Full Close Position Set
SW7: It is not used.
SW8: Local Calibration mode
(When the switch is ON, the input signal is disregarded.
)
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