9.2 Details of Function Codes
9-109
Chap. 9 FUNCTION CODES
9.2.7 J codes (Application functions)
J01 PID Control (Mode selection)
J02 PID Control (Remote command SV)
J03 PID Control P (Gain)
J04 PID Control I (Integral time)
J05 PID Control D (Differential time)
J06 PID Control (Feedback filter)
Under PID control, the inverter detects the state of a control target object with a sensor or
similar device and compares it with the commanded value (e.g. temperature control
command). If there is any deviation between them, PID control operates to minimize it. That
is, it is a closed loop feedback system that matches controlled variable (feedback amount).
PID control expands the application area of the inverter to process control (e.g., flow control,
pressure control, and temperature control.)
If PID control is enabled (J01 = 1 or 2), the frequency control of the inverter is switched from
the drive frequency command generator block to the PID command one.
PID process control block diagram
Mode Selection (J01)
Data for J01 Function
0 Disable
1
Enable
(Process control, normal operation)
J01 selects the PID control mode.
2
Enable
(Process control, inverse operation)
- Using J01 enables switching between normal and inverse operations against the PID
process control output, so you can specify an increase/decrease of the motor rotating speed
to the difference (error component) between the commanded (input) and feedback amounts,
making it possible to apply the inverter to air conditioners. The IVS terminal command can
also switch operation between normal and inverse.
For details of switching between normal and inverse operations, refer to the description
of the IVS ("Switch normal/inverse operation") assigned by any of E01 to E03 (data =
21).
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