Flowserve PMV D20 - Manual (Page 31)

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11.3 PMV D20 symptoms and solutions
Failure Probable Cause Corrective action
No LED is flashing. Current source below 3,6 mA . Verify current source
supplies at least 3,6 mA.
Incorrect wiring polarity. Check wiring for correct
polarity.
Valve position reading Stem position sensor mounting Reposition sensor.
is not what is expected. is off 180 degrees.
D20 not calibrated. Calibrate D20.
Tight shutoff MPC (Minimum No action.
position cutoff) is active.
D20 goes in wrong Change direction
direction. (Section 9.4).
D20 is oscillating. Decrese gain (Section 9.6).
D20 is responding slow. Increse gain (Section 9.6).