EP5 Electro Pneumatic Digital Positioner FCD PMENIM0006-00-A5 12/18
23
Note: All PMV-Positioners are serialized. Please
note down, and provide the serial number when
contacting the factory for trouble shooting or
service.
Signal change has no effect on the actuator
position.
– Check indicator and screw.
– Check air supply to positioner and tubing to
the actuator.
– Check input signal to positioner.
– Check diaphragm for damage or leakage.
– Check pilot valve function.
– Check cam for correct setting.
– Check I/P output
Signal change results in actuator running to end
positions.
– Check coupling between positioner and
actuator.
– Check cam position and locking screw.
– Check input signal.
– Inaccurate positioning.
– Dirty or worn pilot valve.
– Defective or leaking diaphragm.
– Input signal fluctuates.
– Incorrect sizing of actuator.
– Valve/actuator ”stiction”.
– High valve/actuator breakaway torque.
– Loose cam.
14. Trouble shooting
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