IM-P343-44 CTLS Issue 5 25
EP500 Standard Electropneumatic Positioner
Output pressure too low or zero
Cause Remedy
a. No control signal a. Restore mA signal
b. Low air supply pressure b. Verify actuator air pressure requirement
c. Clogged or dirty sensitivity adjuster c. Clean adjuster see Section 5.2.1
d. Incorrect set-up e. Recalibrate
e. Damaged pneumatic actuator or piping f. Verify replace as necessary
Output pressure too high
Cause Remedy
a. Sensitivity adjuster open too far a. Recalibrate
Actuator movement too slow
Cause Remedy
a. Low air supply capacity a. Check supply capacity and pipe sizes
Actuator failing to close
Cause Remedy
a. Output pressure too low a. Refer to previous fault
b. Incorrect zero point b. Recalibrate
c. Valve / actuator coupling incorrect d. Reset (refer to valve / actuator IMI's)
d. Actuator too small e. Fit correct actuator
Fault finding continued on next page
7. Fault Finding
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