Pid Control (Pr. 128 To Pr. 134) - Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual

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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.
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
z
20mADC current input signal used as a feedback value to constitute a feedback system for PID control.
Parameter
Factory Setting
Number
128 10
129 100%
130 1 s
131 9999
132 9999
133 0%
134 9999
<Setting>
( 1 ) Basic PID control configuration
Set point
U
Kp: Proportional constant
( 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.
Setting Range
10, 11, 20, 21
0.1 to 1000%, 9999
0.1 to 3600 s, 9999
0 to 100%, 9999
0 to 100%, 9999
0 to 100%
0.01 to 10.00 s, 9999
Deviation
x
PID
1+
Kp
operation Ti
+
-
y
Process value
Ti: Integral time S: Operator
Pr. 73 "0-5V/0-10V selection"
Pr. 79 "operation mode selection"
Pr. 180 to Pr. 186
Pr. 191 to Pr. 194
Pr. 902 to Pr. 905
Remarks
9999: No proportional control
9999: No integral control
9999: Function invalid
9999: Function invalid
9999: No differential control
Manipulated
variable
fi
1 ‚
Inverter
‚
+Td S
S drive circuit
Td: Differential time
124
PARAMETERS
Related parameters
(input terminal assignment)
(output terminal assignment)
(frequency setting voltage
(current) biases and gains)
Motor
y
IM
Deviation Set point
Process value
P action
I action
PI action
Time
Time
Time