Instruction Manual
D103785X012
Configuration
June 2017
33
Zero Power Condition
—The position of the valve (open or closed) when the electrical power to the instrument is
removed. Zero Power Condition (ZPC) is determined by relay type, as shown in figure 3‐5.
Figure 3‐5. Zero Power Condition
Single‐Acting Direct (Relay A or C
)
Port A pressure to zero.
Single‐Acting Reverse (Relay B)
Double‐Acting (Relay A)
Loss of Electrical Power
Port B pressure to full supply.
Port A pressure to zero.
Port B pressure to full supply.
Relay Type
A
B
X0797
Travel Sensor Motion
WARNING
If you answer YES to the prompt for permission to move the valve when determining travel sensor motion, the instrument
will move the valve through a significant portion of its travel range. To avoid personal injury and property damage caused
by the release of process fluid or pressure, isolate the valve from the process and equalize pressure on both sides of the
valve or bleed off the process fluid.
Travel Sensor Motion
—Select Clockwise, or Counterclockwise. Travel Sensor Motion establishes the proper travel
sensor rotation. Determine the rotation by viewing the end of the travel sensor shaft from the perspective of the
actuator.
D
For instruments with Relay A and C:
If increasing air pressure at output A causes the shaft to turn clockwise, enter
Clockwise. If it causes the shaft to turn counterclockwise, enter Counterclockwise.
D
For instruments with Relay B:
If increasing air pressure at output B causes the shaft to turn counterclockwise, enter
Clockwise. If it causes the shaft to turn clockwise, enter Counterclockwise.
Maximum Supply Pressure
Enter the maximum supply pressure that is required to fully stroke the valve.
