8-2 EB 8359-2 EN
Malfunction
Table 8-1: Troubleshooting
Description of fault Measures
Actuator moves too slowly. Î Check the supply pressure.
Î Check the cross-section of the piping and
screw ttings.
Î Check the conguration of the mounting parts.
Actuator moves in the wrong direction. Î Check piping.
Î Check the conguration of the mounting parts.
Air leaks from the positioner. Î Check the seals in the connecting plate.
The set point span is not reached at a 100% sig-
nal.
Î Check whether the correct range spring has
been selected.
Î Check the adjusted air output and proportional
band.
Î Check the adjusted span.
Zero is not reached at a 0% signal. Î Check the adjusted zero.
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