Mitsubishi Electric FR-D710W-0.1K, Instruction Manual

Page: 214 / 313

212
Special operation and frequency control
(1) PID control basic configuration
Pr. 128 = "20, 21" (measured value input)
(2) PID action overview
1)PI action
2)PD 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 measured value]
(Note) PI action is the sum of P and I actions.
A combination of proportional control action (P) and differential control
action (D) for providing a manipulated variable in response to
deviation speed to improve the transient characteristic.
[Operation example for proportional changes of measured value]
(Note) PD action is the sum of P and D actions.
+-
IM
PID operation
Pr. 133
or terminal 2
Set point
Inverter circuit
Motor
Feedback signal (measured value)
Terminal 4
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Manipulated
variable
0 to 5VDC
(0 to 10VDC)
4 to 20mADC (0 to 5V, 0 to 10V)
Ti S
Kp 1+ +Td S
1
Deviation Set point
Measured value
Time
Time
Time
PI action
I action
P action
Deviation
Set point
Time
Time
Time
PD
action
D
action
P
action
Measured value