Yokogawa YVP110 - Manual (Page 153)

A-42
IM 21B04C01-01E
If you manually set a value, input a value of
SERVO_OUTPUT_SIGNAL when the valve
position settles in the vicinity of 50%.
BOOST_ON_THRESHOLD [1], [2]
Tuning range: 0, 0.1 to 10% (Default: 1.9, 2.9%)
BOOST_OFF_THRESHOLD [1], [2]
Tuning range: 0.1 to 10% (Default: 1.0, 1.0%)
BOOST_VALUE [1], [2]
Tuning range: 0 to 50% of MV (Default: 8, 10%
of MV)
Set the boost function that serves as a function
for accelerating air delivery and exhaust. Tracking
capability for response after an input change
increases.
When the set point is changed, if the difference
between the old set point and the new set point is
greater than the BOOST_ON_THRESHOLD, the
BOOST_VALUE is added to the current output to
the I/P module, and the added value is removed
when the deviation enters the range of BOOST_
OFF_THRESHOLD.
However, each parameter has two values, [1] and
[2], where [1] is for a small step and [2] for a large
step. Therefore, set each parameter so that the
relation [2] ≥ [1] is established.
If the difference between the old set point and
the new set point is greater than BOOST_ON_
THRESHOLD[1] and less than [2], BOOST_
VALUE[1] functions, and the added value is
removed when the deviation enters the range of
BOOST_OFF_THRESHOLD[1].
FA0606.ai
Added to boost
BOOST_ON_THRESHOLD [2]
Added to BOOST_VALUE [1]
BOOST_ON_THRESHOLD [1]
Previous set point
Set point
Removed from BOOST_VALUE [1]
BOOST_OFF_THRESHOLD [1]
Removed from boost
If the difference between the old set point and
the new set point is greater than BOOST_ON_
THRESHOLD[2], BOOST_VALUE[2] functions
independently from BOOST_VALUE[1], and the
added value is removed when the deviation enters
the range of BOOST_OFF_THRESHOLD[2].
BOOST_ON_THRESHOLD [1]
FA0607.ai
Added to BOOST_VALUE [2]
BOOST_ON_THRESHOLD [2]
Previous Set point
Set point
Removed from BOOST_VALUE [2]
BOOST_OFF_THRESHOLD [2]
Added to boost Removed from boost
The boost function of single-acting actuators works
only for the air supply side; however, that of double-
acting actuators also works for the exhaust side of
OUT1 (for the air delivery side of OUT2).
If you want to individually set parameters for the
exhaust side of OUT1 of double-acting actuators,
set the following parameters.
X_BST_ON_THRESHOLD [1], [2]
Tuning range: -10 to 10% (Default: 0, 0%)
X_BST_OFF_THRESHOLD [1], [2]
Tuning range: -10 to 10% (Default: 0, 0%)
X_BOOST_VALUE [1], [2]
Tuning range: -50 to 50% of MV (Default: 0, 0%
of MV)
If you want the boost function of double-acting
actuators on the exhaust side of OUT1 to be
asymmetric from the air delivery side, set these
parameters.
If you set values for these parameters, input
differences for change in relation to the values of
BOOST_ON_THRESHOLD, BOOST_OFF_
THRESHOLD, and BOOST_VALUE.
For example, if you want to stop the boost function
only on the exhaust side, input a negative value
of the absolute value of BOOST_VALUE[1] in
X_BOOST_VALUE[1], and input the value in
X_BOOST_VALUE[2] in the same way to negate
the effect. At this time, you do not need to change
the values of X_BST_ON_THRESHOLD and
X_BST_OFF_THRESHOLD.
Theses parameters are valid only for double-acting
actuators.
SERVO_I_SLEEP_LMT
Tuning range: 0 to 10 sec (Default: 0 sec)
If the deviation changes, the integration operation is
stopped for the time of SERVO_I_SLEEP_LMT to
reduce excessive integral components.