What to do when there is no movement at all?
a. Air is not being supplied to the positioner
To do:
1. Make sure that the compressor is operating as it should
2. Make sure that the regulator connected to the positioner inlet is set
3. Initiate the supply of the designated air supply pressure to the positioner according to product specifications
b. The input signal wiring is incorrect connected
To do:
1. Check to make sure the wiring is connected to the correct terminals and that the plus and minus polarity are not reversed
2. Correct the connection
c. The input signal is not being input
To do:
1. Check that 4 – 20mA is being input by the positioner connection terminals
2. Repair the operating signal origin or repair the signal wiring
d. There is water or oil inside the positioner
To do:
1. Check to see if there is water or oil entrained in the supply air
2. Check to see if the humidity at the control valve piping location is too high
3. Replace with a new positioner/actuator unit and improve the quality of the air supply.