YASKAWA GA700 - Page 724

11.3 b: Application
724 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
Figure 11.35 PID Control Operation
■ PID Control Applications
Table 11.28 shows applications for PID control.
Table 11.28 PID Control Applications
Application Description 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 [PID Mode Setting = 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 11.29 will be the PID setpoint.
When b5-01 = 3 or 4 [PID Mode Setting= Fref + PID Trim or Fref + PID Trim (D on feedback)], one of the
inputs in Table 11.29 will be the PID setpoint.
Table 11.29 Input Methods for the PID Setpoint
Input Methods for the PID Setpoint Setting
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].