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262
Special operation and frequency control
(1) PID control basic configuration
⋅ Pr. 128 = "10, 11, 110, 111" (Deviation value signal input)
⋅ Pr. 128 = "20, 21, 120, 121" (Measured value input)
241 *1
Analog input display
unit switchover
0
0 Displayed in %
Select the unit of analog input display.
1 Displayed in V/mA
553 PID deviation limit 9999
0 to 100.0%*3
Y48 signal is output when the absolute value of deviation
amount exceeds the deviation limit value.
9999 No function
554
PID signal operation
selection
0
0 to 3,
10 to 13
Select the operation to be performed at the detection of upper,
lower, and deviation limit for the measured value input. The
operation for PID output suspension function can be selected.
575
Output interruption
detection time
1s
0 to 3600s
The inverter stops operation if the output frequency after PID
operation remains at less than the Pr. 576 setting for longer
than the time set in Pr. 575.
9999 Without output interruption function
576
Output interruption
detection level
0Hz 0 to 400Hz
Set the frequency at which the output interruption processing is
performed.
577
Output interruption
cancel level
1000%
*3
900 to 1100%
*3
Set the level (Pr. 577 minus 1000%) to release the PID output
interruption function.
C42
(934) *6
PID display bias
coefficient
9999
0 to 500.00 Set the coefficient on bias (minimum) side of terminal 4 input.
9999 Displayed in %.
C43
(934) *6
PID display bias
analog value
20% 0 to 300.0%
Set the converted % on bias (minimum) side current /voltage of
terminal 4 input.
C44
(935) *6
PID display gain
coefficient
9999
0 to 500.00
Set the coefficient on gain (maximum) side of the terminal 4
input.
9999 Displayed in %.
C45
(935) *6
PID display gain
analog value
100% 0 to 300.0%
Set the converted % on gain (maximum) side of current/
voltage of terminal 4 input.
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 201)
*1 This parameter allows its setting to be changed during operation in any operation mode even if "0" (initial value) is set in Pr. 77 Parameter write
selection.
*2 PID control is available without turning X14 signal ON when Pr.128 = "50, 51, 60, 61, 110, 111, 120, 120".
*3 If C42(Pr.934) and C44(Pr.935) are both set to values other than "9999," the setting range for Pr.131 to Pr.133 and Pr.553 become only "9999," and
% is not displayed in the setting range of Pr.577. (Values set in Pr.553 and Pr.577 are converted as differentials. )
*4 Input specification for the terminals are determined by Pr.73 Analog input selection.
*5 Input specification for the terminal is determined by Pr.267 Terminal 4 input selection.
*6 The parameter number in parentheses is the one for use with the parameter unit (FR-PU04/FR-PU07).
Parameter
Number
Name
Initial
Value
Setting
Range
Description
+
-
M
Deviation signal
Feedback signal (measured value)
Ti S
1
1+
+Td S
Kp
PID operation
To outside
Set point
Inverter circuit
Motor
Terminal 1
0 to 10VDC
(0 to 5V)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Manipulated
variable
*
+
-
M
Ti S
Kp 1+ +Td S
1
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 10V, 4 to 20mA)
4 to 20mADC (0 to 5V, 0 to 10V)
*1
*2