Yokogawa YVP110 - Manual (Page 111)

<20. Troubleshooting>
20-3
IM 21B04C01-01E
20.5 Troubleshooting Auto Tuning
Problem Presumed Cause Remedy Ref. 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.
Appendix 1
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.
5.3,
12.4
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.
5.3,
12.4
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.
Chapter 3,
5.3
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. Appendix 6
20.6 Troubleshooting Position, Pressure, and Temperature Sensors
Problem Presumed Cause Remedy Ref. Section
The position sensor signal
remains unchanged.
The feedback lever is not
properly attached.
See the descriptions for positioner
installation.
Chapter 3
The position sensor has failed
or there is breakage in the
cable between the sensor and
amplifier.
If ADVAL_BW does not change
value when the shaft rotates, it
may be necessary to replace
the position sensor. Contact our
nearest representative or service
station.
—
The positon sensor signal
is unstable, or XD_ERROR
indicates error 124.
The position sensor has failed
or there is breakage in the
cable between the sensor and
amplifier.
It may be necessary to replace
the position sensor. Contact the
nearest representative or service
station.
—
The pressure sensor signal
is unstable, or XD_ERROR
indicates error 121.
The pressure sensor has failed. It may be necessary to replace
the amplifier. Contact the nearest
representative or service station.
—
The temperature sensor
signal is unstable, or XD_
ERROR indicates error 120.
The temperature sensor has
failed.
It may be necessary to replace
the amplifier. Contact the nearest
representative or service station.
—