PARAMETERS
124
Pr. 73 "0-5V/0-10V selection"
Pr. 79 "operation mode selection"
Pr. 180 to Pr. 186
(input terminal assignment)
Pr. 191 to Pr. 194
(output terminal assignment)
Pr. 902 to Pr. 905
(frequency setting voltage
(current) biases and gains)
Related parameters
z
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.
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
<Setting>
(
1
)
Basic PID control configuration
+
-
x
y
fi
IM
y
U
Ti
S
1
1+ +Td
S
Kp: Proportional constant Ti: Integral time S: Operator Td: Differential time
Set point
Deviation
Kp
PID
operation
Manipulated
variable
Inverter
drive circuit
Motor
Process value
(
2
)
PID action overview
1) PI action
A combination of proportional control action (P) and integral control action (I) for providing a manipulated
variable in response to deviation and changes with time.
[Operation example for stepped changes of process value]
Note: PI action is the sum of P and I actions.
Time
Time
Time
Process value
P action
I action
PI action
Deviation
Set point
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