127
Auto Tuning
Transducer Block
NOTE Auto Tuning sets the 0% point at the position where the
valve is fully closed and 100% point at the position where
the valve stem stops against the mechanical stopper (fully
open). If it is necessary to adjust the zero point and span
precisely to the rated stroke of the valve, carry out travel
calibration.
The result of auto tuning, which is written to AUTO_TUNE_RESULT, may be an error or
warning. Any error invalidates the tuning and does not update the parameter settings.
7
Travel calibration with step by
step (for very large valve)
Step-by-step travel calibration at the tight-shut and full-open
positions
255 Self-check only Execution of self-diagnostics only (without parameter tuning)
Table 34 Types of Auto Tuning (Continued)
Value Comment Description
Table 35 AUTO_TUNE_RESULT & TRAVEL_CALIB_RESULT
Value Comment Error
/Warning
(*2)
Description
1 Succeeded — Auto tuning/Travel calibration has succeeded.
2 Cancelled — Auto tuning has been canceled.
21
Exhaust air pressure
warning
W
The measured exhaust pressure exceeds ±60 kPa.
22
Small supply air pressure
warning
W
The measured supply air pressure is less than 100 kPa.
23
Large supply air pressure
warning
W
The measured supply air pressure is greater than 800 kPa.
40 Offset drift warning W The offset falls outside the normal operation range.
42
Large Response speed
warning
W
Waiting time for measuring time > 40 seconds.
43 Large hysteresis warning W Hysteresis > 30%
44 Large slip width warning W Slip width > 5%
60 Small angle span warning W Rotation-angle span < 15°.
61
Large angle span warning
W
VALVE_TYPE is linear and the rotation-angle span exceeds
55°; or VALVE_TYPE is rotary and the rotation-angle span
exceeds 95°.
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