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YASKAWA
SIEPC71061753A GA500 Technical Manual
499
target value to the detected value. Use this function to adjust the drive output to accurately match the flow,
pressure, and temperature in the application match the target value.
Use a combination of these controls to increase the performance:
•
P control
P control has a proportional effect on the deviation. It outputs the product (the controlled output) proportional to
the deviation. You cannot use only the offset from P control to get to zero deviation.
•
I control
I control is the integral of the deviation. It uses an integral value of the deviation to output the product (the
controlled output). I control helps align the feedback value and the target value. If you use only a proportional
effect (P control), it will cause and offset. Use a proportional effect with integral control, and the offset will
disappear over time.
•
D control
D control is the derivative of the deviation. D control has an effect on drive output when there are sudden, large
changes in the deviation or feedback value. It quickly returns drive output to the value before the sudden
change. It multiplies a time constant by a derivative value of the deviation (slope of the deviation), and adds that
result to PID input to calculate the deviation of the signal, then it corrects the deviation.
Note:
D control has causes less stable operation because the noise changes the deviation signal. Use D control only when necessary.
■
PID Control Operation
shows PID control operation. The modified output (output frequency) changes when the drive uses
PID control to keep the deviation (the difference between the target value and the feedback value) constant.
Figure 12.28 PID Control Operation
■
PID Control Applications
shows applications for PID control.
Table 12.29 PID Control Applications
Application
Control Content
Sensors Used
Speed Control
•
The drive uses a feedback signal for the machine
speed, and adjusts that speed to align with the target
value.
•
The drive uses speed data from other machinery as the
target value to do synchronous control. The drive then
adds that target value to the feedback from the
machine it is operating to align its speed with the other
machinery.
Tacho generator
Pressure control
The drive uses feedback from the actual pressure to hold
constant pressure.
Pressure sensor
Flow control
The drive uses feedback from the actual flow to hold
constant flow.
Flow rate sensor
Temperature control
The drive uses feedback from the actual temperature to
control a fan and hold constant temperature.
Thermocoupler, thermistor
■
Input Methods for the PID Setpoint
Use
b5-01 [PID Mode Setting]
to select how the PID setpoint is input to the drive.
When
b5-01 = 1 or 2 [Standard or Standard (D on feedback)]
, either the frequency reference set in
b1-01
[Frequency Reference Selection 1]
or
b1-15 [Frequency Reference Selection 2]
will be the PID setpoint, or the
one of the inputs in
will be the PID setpoint.
Содержание CIPR-GA50C series
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Страница 44: ...2 9 Installation Methods 44 YASKAWA SIEPC71061753A GA500 Technical Manual...
Страница 110: ...3 17 Motor Application Precautions 110 YASKAWA SIEPC71061753A GA500 Technical Manual...
Страница 150: ...4 12 Test Run Checklist 150 YASKAWA SIEPC71061753A GA500 Technical Manual...
Страница 156: ...5 2 European Standards 156 YASKAWA SIEPC71061753A GA500 Technical Manual...
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Страница 288: ...7 10 Troubleshooting Without Fault Display 288 YASKAWA SIEPC71061753A GA500 Technical Manual...
Страница 306: ...8 6 Storage Guidelines 306 YASKAWA SIEPC71061753A GA500 Technical Manual...
Страница 454: ...11 22 Parameters Changed by PM Motor Code Selection 454 YASKAWA SIEPC71061753A GA500 Technical Manual...