141
PARAMETERS
4
4.2.42 PID control (Pr. 128 to Pr. 134)
Pr. 128 "PID action selection"
Pr. 129 "PID proportional band"
Pr. 130 "PID integral time"
Pr. 131 "upper limit"
Pr. 132 "lower limit"
Pr. 133 "PID action set point for PU operation"
Pr. 134 "PID differential time"
The inverter can be used to exercise process control, e.g. flow rate, air volume or pressure.
z The voltage input signal (0 to ±5V or 0 to ±10V) or Pr. 133 setting is used as a set point and the 4 to
20mADC current input signal used as a feedback value to constitute a feedback system for PID control.
<Setting>
(1) Basic PID control configuration
Pr. 128 = 10, 11
Pr. 128 = 20, 21
Parameter
Number
Factory
Setting
Setting Range Remarks
128 10 10, 11, 20, 21
129 100% 0.1 to 1000%, 9999 9999: No proportional control
130 1 s 0.1 to 3600 s, 9999 9999: No integral control
131 9999 0 to 100%, 9999 9999: Function invalid
132 9999 0 to 100%, 9999 9999: Function invalid
133 0% 0 to 100%
134 9999 0.01 to 10.00 s, 9999 9999: No differential control
Related parameters
Pr. 73 "0-5V/0-10V selection"
Pr. 79 "operation mode selection"
Pr. 180 to Pr. 186
(input terminal assignment)
Pr. 190 to Pr. 195
(output terminal assignment)
Pr. 902 to Pr. 905
(frequency setting voltage
(current) biases and gains)
+
-
IM
Deviation signal
Feedback signal (process value)
Ti S
1
1+
+Td S
Kp
PID operation
To external
Set point
Inverter circuit
Motor
Terminal 1
Kp : Proportional Ti : Integral time S : Operator Td : Differential time
Manipulated
variable
+
-
IM
Ti ×S
Kp 1+ +Td × S
1
PID operation
DC 0 to ±5
(0 to ±10)V
4 to 20mAFeedback signal (process value)
Set point
Inverter circuit
Motor
Terminal 4
Kp : Proportional Ti : Integral time S : Operator Td : Differential time
Manipulated
variable
Pr. 133 or terminal 2
