Mitsubishi Electric 800 Series Instruction Manual page 341

Pr. Name
610 PID measured value
A625 input selection
1015 Integral stop selection at
A607 limited frequency
 Basic configuration of PID control
 Pr.128 = "50, 51, 1010, 1011, 2010, 2011" (deviation input)
Set point
To outside
 Pr.128 = "20, 21" (measured value input)
Pr.133 or
terminal 2
0 to 5 VDC
(0 to 10 V, 4 to 20 mA)
*1 Set "0" to Pr.858 Terminal 4 function assignment. When Pr.858 ≠ "0", PID control is invalid.
 PID action outline
 PI action
PI action is a combination of proportional action (P) and integral action (I), and applies a manipulated amount according to the
size of the deviation and transition or changes over time.
[Example of action when the measured value changes in a stepped manner]
Deviation Set point
Measured value
P action
I action
PI action
(Note) PI action is the result of P and I actions being added together.
 PD action
PD action is a combination of proportional action (P) and differential action (D), and applies a manipulated amount according
to the speed of the deviation to improve excessive characteristics.
340
14.(A) Application Parameters
14.4 PID control
Initial value Setting range
2
3
3
4
5
0
0 1
2
Deviation input
via communication
or according to Pr.609
+ -
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
+ -
Set point
Terminal 4
Feedback signal (measured value) 4 to 20 mADC (0 to 5 V, 0 to 10 V)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Time
Time
Time
The measured value is input through terminal 2.
The measured value is input through terminal 4.
The measured value is input via communication.
The measured value is input by the PLC function.
The integral stops when the manipulated amount is limited. The
range is ±100% for the manipulated amount.
The integral does not stop when the manipulated amount is limited.
The range is ±100% for the manipulated amount.
The integral stops when the manipulated amount is limited. The
range is ±100% for the manipulated amount.
Inverter circuit
PID operation
1
Kp 1+ +Td×S
Ti × S
Inverter circuit
PID operation
1
Kp 1+ +Td×S
Ti × S
*1
Description
Motor
Manipulated
variable
M
Motor
Manipulated
variable
M