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Pid Control (pr. 128 To Pr. 134) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

Transistorized inverter, high function & low acoustic noise.
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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
Deviation
Set point
+
-
y
U
Process value
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.
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Setting Range
10, 11, 20, 21
0.1 to 1000%, 9999
9999: No proportional control
0.1 to 3600 s, 9999
9999: No integral control
0 to 100%, 9999
9999: Function invalid
0 to 100%, 9999
9999: Function invalid
0 to 100%
0.01 to 10.00 s, 9999
9999: No differential control
Manipulated
variable
x
fi
1
PID
1+
+Td
S
Kp
operation
Ti
S
Ti: Integral time
S: Operator
Td: Differential time
124
PARAMETERS
Related parameters
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)
Remarks
Motor
y
Inverter
IM
drive circuit
Deviation Set point
Process value
P action
I action
PI action
Time
Time
Time

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