YASKAWA GA800 Programming Manual page 223

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PID Control Applications
Table 2.24 shows applications for PID control.
Application
Speed Control
Pressure control
Flow control
Temperature control
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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)], 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 values
shown in Table 2.25 will be the PID setpoint.
When b5-01 = 3 or 4 [Fref + PID Trim or Fref + PID Trim (D on feedback)], one of the inputs in
the PID setpoint.
Input Methods for the PID Setpoint
Multi-function analog input terminal A1
Multi-function analog input terminal A2
Multi-function analog input terminal A3
MEMOBUS/Modbus register 0006H
Pulse train input terminal RP
b5-19 [PID Setpoint Value]
Note:
If you set two inputs for the PID setpoint, it will trigger operation error oPE07 [Analog Input Selection Error].
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Entering the PID Feedback Value
You can use two methods to input the PID feedback value to the drive. One method uses a single feedback signal for
usual PID control. The other method uses two signals. The difference between those signals sets the deviation.
• Use one feedback signal.
Use Table 2.26 to select how the feedback signal is input to the drive for PID control.
PID Feedback Input Method
Multi-function analog input terminal A1
Multi-function analog input terminal A2
Multi-function analog input terminal A3
Pulse train input terminal RP
• The drive uses two feedback signals, and the difference between those signals becomes the deviation.
Use to select how the second feedback signal is input to the drive.
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Table 2.24 PID Control Applications
Control Content
• 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.
The drive uses feedback from the actual pressure to hold
constant pressure.
The drive uses feedback from the actual flow to hold
constant flow.
The drive uses feedback from the actual temperature to
control a fan and hold constant temperature.
Table 2.25 Input Methods for the PID Setpoint
Set H3-02 = C [Terminal A1 Function Selection = PID Setpoint].
Set H3-10 [Terminal A2 Function Selection] = C.
Set H3-06 [Terminal A3 Function Selection] = C.
Sets MEMOBUS/Modbus register 000FH (Control Selection Setting) bit 1 to 1 (PID
setpoint input). Enters the PID setpoint to MEMOBUS/Modbus register 0006H (PID
Target, 0.01% units, signed).
Set H6-01 = 2 [Terminal RP Pulse Train Function = PID Setpoint Value].
Set b5-18 = 1 [b5-19 PID Setpoint Selection = Enabled]. Enters the PID setpoint to b5-19.
Table 2.26 PID Feedback Input Method
Set H3-02 = B [PID Feedback].
Set H3-10 = B.
Set H3-06 = B.
Set H6-01 = 1 [PID feedback value].
2.3 b: Application
Sensors Used
Tacho generator
Pressure sensor
Flow rate sensor
Thermocoupler, thermistor
Table 2.25
Setting Value
Setting Value
will be
2
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