Hitachi SJ Series, User Manual

Page: 281 / 786

Chapter 12
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•
•
Chapter 12
Adjust PID2/PID3/PID4 control
• When response is not stabilized in PID function
operation, adjust according to the following
procedure.
• Adjust respective PID gains for each
PID2/PID3/PID4.
• Gain correspondence table
PID2
PID3
PID4
A
• Output response is slow and feedback value does not
change swiftly even if PID target value was changed.
• Feedback value changes swiftly and is not stabilized.
• Overshooting or hunting occurs.
• PID target value and feedback value do not match
easily.
• Feedback value vibrates mildly.
• t takes time for operation to be stabilized.
• Response is slow even if proportional gain was increased.
• Small hunting occurs.
• Response due to disturbance is large and it takes time
until stabilization.
Chapter 12
Adjust PID2/PID3/PID4 control
When response is not stabilized in PID function
operation, adjust according to the following
procedure.
Adjust respective PID gains for each
2/PID3/PID4.
Gain correspondence table
[1] Proportional
PID2 [AJ
PID3 [AJ
PID4 [AJ
Phenomenon
Output response is slow and feedback value does not
change swiftly even if PID target value was changed.
Feedback value changes swiftly and is not stabilized.
Overshooting or hunting occurs.
PID target value and feedback value do not match
Feedback value vibrates mildly.
me for operation to be stabilized.
Response is slow even if proportional gain was increased.
Small hunting occurs.
Response due to disturbance is large and it takes time
until stabilization.
Adjust PID2/PID3/PID4 control
When response is not stabilized in PID function
operation, adjust according to the following
Adjust respective PID gains for each
Gain correspondence table
[1] Proportional
gain
[2] Integral gain
[AJ-13]
[AJ-33]
[AJ-53]
Phenomenon
Output response is slow and feedback value does not
change swiftly even if PID target value was changed.
Feedback value changes swiftly and is not stabilized.
Overshooting or hunting occurs.
PID target value and feedback value do not match
Feedback value vibrates mildly.
me for operation to be stabilized.
Response is slow even if proportional gain was increased.
Response due to disturbance is large and it takes time
12
When response is not stabilized in PID function
operation, adjust according to the following
Adjust respective PID gains for each
[2] Integral gain
[AJ-14]
[AJ-34]
[AJ-54]
Output response is slow and feedback value does not
change swiftly even if PID target value was changed.
Feedback value changes swiftly and is not stabilized.
PID target value and feedback value do not match
me for operation to be stabilized.
Response is slow even if proportional gain was increased.
Response due to disturbance is large and it takes time
12-10-26
When response is not stabilized in PID function • If acceleration/deceleration time is set too long,
following of output frequency will be delayed and
control may not be successful.
In this case, set the acceleration/deceleration time
short.
[2] Integral gain
[3] Differential
gain
[AJ-15]
[AJ-35]
[AJ-55]
!
Output response is slow and feedback value does not
change swiftly even if PID target value was changed. •
Feedback value changes swiftly and is not stabilized. •
PID target value and feedback value do not match •
•
Response is slow even if proportional gain was increased.
•
Response due to disturbance is large and it takes time •
26
If acceleration/deceleration time is set too long,
following of output frequency will be delayed and
control may not be successful.
In this case, set the acceleration/deceleration time
short.
[3] Differential
gain
15]
35]
55]
Examples of measures
Increase PID proportional gain according to
correspondence table [1].
Decrease PID proportional gain according to the
correspondence table [1].
Decrease PID integral gain according to the
correspondence table [2].
Increase PID integral gain according to the
correspondence table [2].
Increase PID differential gain according to the
correspondence table [3].
Decrease PID differential gain according to the
correspondence table [3].
If acceleration/deceleration time is set too long,
following of output frequency will be delayed and
control may not be successful.
In this case, set the acceleration/deceleration time
Examples of measures
Increase PID proportional gain according to
correspondence table [1].
Decrease PID proportional gain according to the
correspondence table [1].
Decrease PID integral gain according to the
correspondence table [2].
Increase PID integral gain according to the
correspondence table [2].
Increase PID differential gain according to the
correspondence table [3].
PID differential gain according to the
correspondence table [3].
Inverter Functions
If acceleration/deceleration time is set too long,
following of output frequency will be delayed and
control may not be successful.
In this case, set the acceleration/deceleration time
Examples of measures
Increase PID proportional gain according to
correspondence table [1].
Decrease PID proportional gain according to the
correspondence table [1].
Decrease PID integral gain according to the
correspondence table [2].
Increase PID integral gain according to the
correspondence table [2].
Increase PID differential gain according to the
correspondence table [3].
PID differential gain according to the
correspondence table [3].
Inverter Functions
If acceleration/deceleration time is set too long,
following of output frequency will be delayed and
In this case, set the acceleration/deceleration time
Increase PID proportional gain according to the
Decrease PID proportional gain according to the
Decrease PID integral gain according to the
Increase PID integral gain according to the
Increase PID differential gain according to the
PID differential gain according to the
Inverter Functions
In this case, set the acceleration/deceleration time
Decrease PID proportional gain according to the