4-4
If auto setup fails, refer to 5-1-5, “Auto Setup Failure.”
The reverse action actuator fully closes, fully opens, and fully closes the valve when
auto setup starts. The direct action actuator fully opens, fully closes, and fully opens
the valve.Then, it is opened to between 20% and 25% and between 80% and 85%.
After auto setup, the valve moves to the opening appropriate to the input signal.
The following items are automatically adjusted and set during auto setup.
(1) Zero span adjustment
The zero point is set to the travel when the valve is fully closed. The span point (100
% travel) is set in such a way that the travel when the valve is fully opened is Travel
Cutoff High + 1 %. (If Travel Cutoff High is 99 %, the fully opened position is the span
point.) If the span is adjusted after auto setup, Travel Cutoff High will be automatically
changed and saved.
(2) Input signal range (Input Range), Input Range Low (Close) and Input Range High
(Open) settings
The input range settings are changed so that the valve operation direction (close
or open) when the input current is lowered from 20 mA to 4 mA is the same as the
direction for power-off (input current: 0 mA).
Example: If Valve Closed Position is set to DOWN (normal)
When the actuator action is reversed:
Input Range Low (Close) = 4mA, Input Range High (Open) = 20mA
When the actuator action is forwarded:
Input Range Low (Close) =20mA, Input Range High (Open) = 4mA
(3) Specification of Actuator Size
Select the actuator size from among Param 1 to Param 6, Param A, B, and C.
(4) Specification of Friction Level
Select the friction level of the gland packing from among LIGHT, MEDIUM, and HEAVY.
(5) Specification of Feedback Lever Motion
Specify UP or DOWN as the operation of the feedback lever when output air
pressure OUT1 increases.
(6) Specification of Positioner Action
When the input signal is “Disconnected,” the positioner operation is forward operation
(Direct) if the output air pressure is 0.
When the input signal is “Disconnected,” the positioner operation is reverse operation
(Reverse) if the output air pressure is the supply air pressure.
(7) Specification of Pilot Relay Type
Select Single Acting or Double Acting as the operation of the actuator.
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