YASKAWA GA800 Series, Техническое описание

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Parameter
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12
12.3 b: Application
YASKAWA SIEPC71061737B GA800 Drive Technical Reference 687
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PID Control Applications
Table 12.24 shows applications for PID control.
Table 12.24 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
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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 12.25 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 Table 12.25 will be
the PID setpoint.
Table 12.25 Input Methods for the PID Setpoint
Input Methods for the PID Setpoint Setting Value
Multi-function analog input terminal A1 Set H3-02 = C [Terminal A1 Function Selection = PID Setpoint] .
Multi-function analog input terminal A2 Set H3-10 [Terminal A2 Function Selection] = C .
Multi-function analog input terminal A3 Set H3-06 [Terminal A3 Function Selection] = C .
MEMOBUS/Modbus register 0006H 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).
Pulse train input terminal RP Set H6-01 = 2 [Terminal RP Pulse Train Function = PID Setpoint Value] .
b5-19 [PID Setpoint Value] Set b5-18 = 1 [b5-19 PID Setpoint Selection = Enabled] . Enters the PID setpoint to b5-19 .
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 12.26 to select how the feedback signal is input to the drive for PID control.
Table 12.26 PID Feedback Input Method
PID Feedback Input Method Setting Value
Multi-function analog input terminal A1 Set H3-02 = B [PID Feedback] .
Multi-function analog input terminal A2 Set H3-10 = B .
Multi-function analog input terminal A3 Set H3-06 = B .
Pulse train input terminal RP Set H6-01 = 1 [PID feedback value] .
•
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.