Mitsubishi Electric FR-A720-0.4K Instruction Manual page 355

Parameter
Name
Number
134 PID differential time
*1
Output interruption
575
detection time
Output interruption
576
detection level
Output interruption
577
cancel level
*1 Pr. 129, Pr. 130, Pr. 133 and Pr. 134 can be set during operation. They can also be set independently of the operation mode.
(1) PID control basic configuration
⋅Pr. 128 = "10, 11" (Deviation value signal input)
Set point
To outside
⋅Pr. 128 = "20, 21" (Measured value input)
Pr. 133 or
terminal 2
Set point
0 to 5VDC
(0 to 10V, 4 to 20mA)
Initial Setting
Value Range
For deviation lamp input, time (Td) required for providing only
0.01 to the manipulated variable for the proportional (P) action. As the
10.00s differential time increases, greater response is made to a
9999
deviation change.
9999 No differential control
The inverter stops operation if the output frequency after PID
0 to 3600s operation remains at less than the Pr. 576 setting for longer
1s
than the time set in Pr. 575.
9999 Without output interruption function
Set the frequency at which the output interruption processing
0Hz 0 to 400Hz
is performed.
Set the level (Pr. 577 minus 1000%) at which the PID output
1000% 900 to 1100%
interruption function is canceled.
Inverter circuit
PID operation
Deviation signal
+ -
Terminal 1
1+
Kp
0 to 10VDC
(0 to 5V)
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Inverter circuit
PID operation
+ -
Kp 1+
Ti
Terminal 4
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Special operation and frequency control
Description
Motor
Manipulated
variable
1
+Td S
Ti S
Motor
Manipulated
variable
1
+Td S
S
4 to 20mADC (0 to 5V, 0 to 10V)
IM
IM
345
4