PALMSTIERNAS D3, Manual

Page: 47 / 60

47
9. Trouble shooting
Fault symptom
Change in input signal to positioner does
not affect actuator position.
Change in input signal to positioner ma-
kes actuator move to its end position.
Inaccurate regulation.
Slow movements, unstable regulation.
Action
• Check air supply pressure, air
cleanliness, and connection between po-
sitioner and actuator.
• Check input signal to positioner.
• Check mounting and connections of po-
sitioner and actuator.
•Check input signal.
•Check mounting and connections of po-
sitioner and actuator.
• Implement auto-tuning. Check for any
leaks.
• Uneven air supply pressure.
• Uneven input signal.
• Wrong size of actuator being used.
• High friction in actuator/valve package.
• Excess play in actuator/valve package.
• Excess play in mounting of positioner
on actuator.
• Dirty/humid supply air.
• Implement auto-tuning.
• Adjust the pressure adjusting screws.
• Increase the deadband (Tuning menu).
• Adjust Performance (Calibrate menu).