3-7
Chapter 3: Operation
3.2.1 Procedure to adjust valve to fully closed position (zero point)
The procedure to adjust the valve to the fully closed position (zero point) is shown
below.
Step Procedure
1 Input from a controller (constant-current supply) the preset electric current in the
amount that corresponds to the valve being fully closed. (Example: 4 mA)
2 Adjust the fully closed position of the valve by turning the adjustment screw in the
clockwise or counterclockwise direction. See Figure 3-2-1 or Figure 3-2-2 regarding
adjustment direction. (If the forced fully closed function is operating, the valve will not
move. To change the forced fully closed setting, see 4.4.7, “Forced fully open/closed
setting.” The default value is 0.5%.)
3.2.2 Procedure to adjust valve to fully open position (span point)
The procedure to adjust the valve to the fully open position (span point) is shown
below.
Step Procedure
1 Input from a controller (constant-current supply) the preset electric current in the
amount that corresponds to the valve being fully open. (Example: 20 mA)
2 Adjust the fully open position of the valve by turning the adjustment screw in the
clockwise or counterclockwise direction. See Figure 3-2-1 or Figure 3-2-2 regarding
adjustment direction.
Note
• After valve fully open/closed position (zero/span) adjustment, vary the input signal
and confirm that the corresponding position results.
• After adjustment ends, hold the input signal at 4mA or higher for 30seconds so
that the position settings are written to non-volatile memory.
• If a span adjustment is performed after auto-setup has been executed, the forced
fully open value will be automatically set to −1% of the overstroke. If necessary,
reconfigure the forced fully open value.
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