YASKAWA GA700 Technical Manual page 619

Application
Flow control
Temperature control
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Input Methods for the PID Setpoint
Select how the PID setpoint is input to the drive with b5-01 [PID Function Setting].
If b5-01 = 1 or 2 [PID Function Setting = Enabled D=Fdbk or Enabled D=Fdfwd], then the frequency reference
set in b1-01 [Reference 1 Source] or b1-15 [Frequency Reference Selection 2] will be the PID setpoint, or the one
of the values shown in the following table will be the PID setpoint.
If b5-01 = 3 or 4 [PID Function Setting= Fref+PID D=Fdbk or Fref+PID D=Fdfwd], then one of the inputs in
the following table will be 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:
Setting two inputs for the PID setpoint will trigger operation error oPE07 [MF Analog Input Selection Error].
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Entering the PID Feedback Value
There are two ways of inputting the PID feedback value to the drive. One method uses a single feedback signal for
normal PID control. The other method uses two signals, and the difference between those signals determines the
deviation.
• Using one feedback signal.
Select how the feedback signal is input to the drive for PID control from the following table.
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.
Select how the second feedback signal is input to the drive from the following table. The drive calculates the
deviation of the second feedback value. Enable the second feedback signal that is used to calculated the
deviation by setting H3-02, H3-06, or H3-10 = 16 [Terminal A1/A3/A2 Function Selection = Differential PID
feedback].
PID Differential Feedback Input Method
Multi-function analog input terminal A1
Multi-function analog input terminal A2
Multi-function analog input terminal A3
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
The drive maintains constant flow by using
feedback from the actual flow.
The drive maintains constant temperature by
controlling a fan using feedback from the
actual temperature.
Table 11.24 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 [PulseTrain InTerm RP Func Select = PID setpoint
value].
Set b5-18 = 1 [PID Setpoint Selection = Enabled]. Enters the PID
setpoint to b5-19.
Table 11.25 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].
Table 11.26 PID Differential Feedback Input Method
Set H3-02 = 16 [Differential PID feedback].
Set H3-10 = 16.
Set H3-06 = 16.
11.3 b: Application
Sensors Used
Flow rate sensor
Thermocoupler, thermistor
Setting
Setting
Setting
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