- Discrete units – is shaft connected in correct orientation? The feedback pot strap may need replacing if orientation is incorrect.
- Has main feedback pot been rotated, or does it need rotating because the unit has been subjected to change in direction of movement on loss of signal? See section 4.11 – Resetting Feedback Pot.
- Is air supply clean, dry, and oil free?
Unit moves slower than expected up-scale or downscale:
- Check air pressure – above 50psi / 3.5 Bar?
- Check flow adjuster screws – has one been screwed in?
- Is air supply clean, dry and oil free? If not there is a possibility that the positioner servo has been damaged.
Movements are too jerky:
- Adjust proportional gain to increase smoothness – then reset damping and setpoints as instructed in Section 4.
Lack of sensitivity to changes in signal:
- Adjust proportional gain to increase sensitivity – then reset damping, and setpoints as instructed in Section 4.
Set point is overshot when positioner moves rapidly: