IM-P343-44 CTLS Issue 526
EP500 Standard Electropneumatic Positioner
Actuator failing to fully open valve
Cause Remedy
a. Output pressure too low a. Refer to previous fault
b. Incorrect travel adjustment b. Recalibrate see
c. Valve / actuator coupling incorrect d. Reset (refer to valve / actuator IMI's)
d. Actuator too small e. Fit correct actuator
Hunting
Cause Remedy
a. Incorrect controller set up (P, I, and D) a. Verify and adjust according to process requirement
b. Sensitivity orice closed too far b. Adjust by opening sensitivity screw
c. Excessive valve friction c. Verify and maintain as valve IMI
d. Control valve over-sizing d. Verify operating conditions against valve capacity
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