Mitsubishi Electric FR-D720-008 Instruction Manual page 223

(1) Dancer control block diagram
Main speed command
*1
PID deviation
Dancer roll
+
setting point
Pr. 133
PID set point
Convert to 0 to 100%
Terminal 4
∗1
The main speed can be selected from all operation mode such as external (analog voltage input, multi-speed), PU (digital frequency setting), and
communication (RS-485).
Set point and measured value of PID control
Input
Set point Pr. 133
When measured value is input as current
(4 to 20mA)
Measured
value
When measured value is input as voltage
(0 to 5V or 0 to 10V)
NOTE
Changing the terminal function using any of Pr.178 to Pr.182 may affect the other functions. Make setting after
confirming the function of each terminal.
When the Pr. 267 setting was changed, check the voltage/current input switch setting. Different setting may cause a
fault, failure or malfunction. (Refer to page 148 for setting)
Acceleration/deceleration
of main speed
PID control
1
Kp(1+ + Td S)
Ti S
-
PID feedback
.....
4mA
........
0V
0V .......... 0%, 10V....... 100%
Special operation and frequency control
Ratio
Pr. 128 = 42, 43
X14
Pr. 128 = 40, 41
Potentiometer
Dancer roll position detection
Input Signal Pr.267 Setting Voltage/Current Input Switch
0 to 100% —
0%, 20mA .. 100% 0
1
0%, 5V ........ 100%
2
Target frequency
Acceleration/
Limit
deceleration
+
+
IM
—
4
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