Mitsubishi Electric FR-A700 Instruction Manual page 671

Parameter
PID control basic configuration
Set point
controller component
Fig. 6-235: System configuration when Pr. 128 = 10, 11 (using an external (PID) controller)
Pr. 133 or
terminal 2
Fig. 6-236: System configuration when Pr. 128 = 20 or 21 (set/feedback value at the inverter)
PI action overview
A combination of P action (P) and I action (I) for providing a manipulated variable in response
to deviation and changes with time.
FR-A700 EC
Deviation signal
(0–±5V DC)
external
Kp: Proportionality constant; Ti: Integral time; S: Operator; Td: Differential time
Set point
0–5V DC
(0–10V DC, Terminal 4
4–20mA DC)
Feedback signal (measured value),
4–20mA DC (0–5V DC, 0–10V DC)
Kp: Proportionality constant; Ti: Integral time; S: Operator; Td: Differential time
Set point
Deviation
P action
I action
PI action
Inverter
[
1
Kp 1+
Ti S
•
Terminal 1
0–±10V DC
PID operation
Feedback signal (measured value)
Inverter
[
1
Kp 1+
Ti S
•
PID operation
Fig. 6-237:
Operation example for stepped changes of
Measured
measured value
value
t
t
t
Special operation
Motor
Manipulated
variable
[
+Td S
•
Motor
Manipulated
variable
[
+Td S
•
I001230E
I001231E
I000045C
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