181
Troubleshooting AutoTuning
Troubleshooting
Troubleshooting AutoTuning
Table 58 Troubleshooting AutoTuning
Problem Presumed Cause Remedy See Section
Auto tuning requests are
rejected.
Either or both of the A/O block
and transducer block are not in
O/S mode.
Change the target modes
of the AO and transducer
block to O/S.
“Function Block
Parameters” on
page 183
When auto tuning has
finished,
AUTO_TUNE_RESULT
changes value to an index
from 21 to 23.
There is something wrong with
the air supply pressure or
spring range.
Check whether the
measured pressure
reading nearly equals the
actual pressure. See the
descriptions for auto
tuning.
❑ “Carrying out
Tuning” on
page 61
❑ “Auto Tuning”
on page 126
When auto tuning has
finished,
AUTO_TUNE_RESULT
changes value to index 40
or 120.
There is something wrong with
the operation point of the I/P
module.
SERVO_OFFSET could not
be measured.
If there is nothing wrong
with the air supply
pressure and piping,
contact the nearest
service station or
representative office.
—
When auto tuning has
finished,
AUTO_TUNE_RESULT
changes value to an index
from 42 to 44, or from 120
to 123.
The measured time delay
constant, hysteresis, and/or
slip width of the valve is
excessively large.
Check whether they meet
the characteristics
specified for the valve.
See the descriptions for
auto tuning.
❑ “Carrying out
Tuning” on
page 61
❑ “Auto Tuning”
on page 126
When auto tuning has
finished,
AUTO_TUNE_RESULT
changes value to an index
from 60 to 62, or from 100
to 103.
The span of rotation angle is
incorrect or the 50% position
deviation from the horizontal
level is too large.
Correct the installation and
try auto tuning again.
❑ “Installing the
FVP110 on the
Actuator” on
page 35
❑ “Carrying out
Tuning” on
page 61
When auto tuning has
finished,
AUTO_TUNE_RESULT
changes value to an index
from 60 to 62, or from 120
to 123.
The valve hysteresis is large. Carry out manual tuning. “Manual Tuning
Guideline” on
page 253
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