Mitsubishi Electric FR-F820-00077 Instruction Manual page 528

(A) Application parameters
Basic configuration of PID control
● Pr. 128 = "10, 11" (deviation value signal input)
* Set "0" to Pr. 868 "Terminal 1 function assignment". When Pr. 868 ≠ "0", PID control is invalid.
Fig. 5-159:
● Pr. 128 = "20, 21" (measured value input)
Note that the input of terminal 1 is added to the set point of terminal 2 as a set point.
Set "0" to Pr. 858 "Terminal 4 function assignment". When Pr. 858 ≠ "0", PID control is invalid.
Fig. 5-160:
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.
NOTE PI action is the result of P and I actions being added together.
5 - 356
Deviation signal
Set point
To outside
Feedback signal (measured value)
Kp: Proportionality constant; Ti: Integral time; S: Operator; Td: Differential time
System configuration when Pr. 128 = 10, 11 (using an external (PID) controller)
Pr. 133 or
terminal 2
Set point
0 to 5 V DC
Terminal 4
(0 to 10 V, 4 to 20 mA)
Feedback signal (measured value)
Kp: Proportionality constant; Ti: Integral time; S: Operator; Td: Differential time
System configuration when Pr. 128 = 20 or 21 (set/feedback value at the inverter)
Deviation Set point
Measured value
P action
Time
I action
Time
PI action
Time
Inverter circuit
[
1
Kp 1+
Ti S
•
Terminal 1 *
0 to ±10 V DC
(0 to ±5 V)
PID operation
Inverter circuit
[ 1
Kp 1+
Ti S
•
PID operation
Fig. 5-161:
Operation example for stepped changes of
measured value
Motor
Manipulated
variable
[
+Td S •
Motor
Manipulated
variable
[
+Td S
•
4 to 20 mA DC
(0 to 5 V, 0 to 10 V)
Parameters
I001230E
I001231E
I002689E