Yokogawa YVP110 - Manual (Page 72)

<12. Transducer Block>
12-3
IM 21B04C01-01E
12.4 Auto Tuning
CAUTION
This function strokes the valve over its full range.
Do not execute while valve is controlling the
process. Keep away from the movable parts to
avoid injury.
Auto tuning checks the valve responses and
automatically tunes control parameter settings. The
actions to be performed can be chosen as shown
in the table below (for how to carry out auto tuning,
see Chapter 5, “Setup”). Before carrying out auto
tuning, change the modes of the AO function block
and transducer block to O/S.
Table 12.2 Types of Auto Tuning
value Comment Description
1 Off —
2 Travel calibration
tuning at stop point
Travel calibration at the
tight-shut and full-open
positions
3 Control parameter
tuning
Tuning of control
parameters
4 Travel calibration at
stop point & Control
parameter tuning
Sequential execution
of travel calibration and
control parameter tuning
5 Cancel execution Cancellation of auto
tuning execution
6 Travel calibration at
stop point without
time out (for very
large valve)
Zero-point and span
calibration at the tight-shut
and full-open positions
without time out
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)
IMPORTANT
Auto Tuning in YVP110 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 which is described later in
this chapter after the Auto Tuning.
The result of auto tuning, which is written to AUTO_
TUNE_RESULT, may be an error or warning. An
error invalidates the tuning and does not update the
parameter settings.
Table 12.3 AUTO_TUNE_RESULT & TRAVEL_
CALIB_RESULT
Value
* 1
Comment
Error * 2
/Warning
Description
1 Succeeded — Auto tuning/Travel
calibration has succeeded.
2 Canceld — 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
degrees
61 Large angle span
warning
W VALVE_TYPE is linear and
the rotation-angle span
exceeds 55 degrees; or
VALVE_TYPE is rotary and
the rotation-angle span
exceeds 95 degrees.
62 50% angle warning W VALVE_TYPE is linear and
the rotation angle at the
50% position exceeds ±20
degrees.
100 Small angle span
error
W Rotation-angle span < 5
degrees
101 Large angle span
error
E VALVE_TYPE is linear and
the rotation-angle span
exceeds 60 degrees; or
VALVE_TYPE is rotary and
the rotation-angle span
exceeds 100 degrees.
102 50% angle error E VALVE_TYPE is linear and
the rotation angle at the
50% position exceeds ±25
degrees.
103 Linear adjust error E FINAL_VALUE.value falls
outside 50 ±10% at 50%
position.
120 Offset
measurement failed
error
E Offset measurement has
failed.
121 Gain measurement
failed error
E Gain measurement has
failed.
122 Response speed
measurement failed
error
E Response speed
measurement has failed.
123 Hysteresis
measurement failed
error
E Hysteresis measurement
has failed.
255 In operation — Auto tuning is being
executed.
*1: Number 103 is not shown for AUTO_TUNE_RESULT.
Number 1 through 44 and 120 through 123 are not shown
for TRAVEL_CALIB_RESULT.
*2: E stands for ‘Error’, and W stands for ‘Warning’.