Mitsubishi Electric FR-E700 Instruction Manual page 412

Special operation
PID control basic configuration
Pr. 133 or
terminal 2
Fig. 6-132: System configuration when Pr. 128 = 20 or 21 (set/feedback value at the inverter)
PI action
A combination of P action (P) and I action (I) for providing a manipulated variable in response
to deviation and changes with time.
6 - 272
Set point
0–5V DC
Terminal 4
(0–10V DC)
Kp: Proportionality constant; Ti: Integral time; S: Operator; Td: Differential time
Deviation Set point
P action
I action
PI action
Inverter
[ 1
Kp 1+ +Td S
•
Ti S
•
PID operation
Feedback signal (measured value),
4–20mA DC (0–5V DC, 0–10V DC)
Fig. 6-133:
Operation example for stepped changes of
Measured
measured value
value
t
t
t
Parameter
Motor
Manipulated
variable
[
I001231E
I000045C