Adjusting Frequency References
Adjusting Frequency References
This section explains methods of adjusting frequency references.
Adjusting Analog Frequency References
Gain and bias are among the constants used to adjust analog inputs.
Related Constants
Constant
Number
Name Description
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
H3-01
H3-02
H3-03
H3-04
H3-05
H3-06
H3-07
H3-08
H3-09
H3-10
H3-11
Signal level selection (terminal A1)
0: 0 to ±10V
1: 0 to ±10V
Gain (terminal A1)
Bias (terminal A1)
Sets the frequency when 10 V is input. as a percentage of the maximum output frequency.
Sets the frequency when 0 V is input, as a percentage of the maximum frequency.
Signal level selection (terminal A3)
Multi-function analog input (terminal A3) function selection
0: 0 to ±10V
1: 0 to ±10V
Select from the functions listed in the following table. Refer to the next page.
Gain (terminal A3)
Bias (terminal A3)
Signal level selection
(terminal A2)
Sets the input gain (level) when
10V is input.
Set according to the 100% value selected from H3-05.
Sets the input gain (level) when
0 V is input.
Set according to the 100% value selected from H3-05.
0: 0 to +10V, with lower limit
1: 0 to ±10V without lower limit
2: 4 to 20 mA
Switch current and voltage input using the switch on the control panel.
Multi-function analog input (terminal A2) function selection
Select multi-function analog input function for terminal A2.
Refer to the next table.
Gain (terminal A2)
Bias (terminal A2)
Sets the input gain (level) when
10 V (20 mA) is input.
Set according to the 100% value for the function set for H3-09.
Sets the input gain (level) when
0 V (4 mA) is input.
Set according to the 100% value for the function set for H3-09.
0 or 1
0.0 to
1000.0
-100.0
to
+100.0
0 or 1
0 to 1F
0.0 to
1000.0
100.0 to
+100.0
0 to 2
0 to 1F
0.0 to
1000.0
-100.0
to
+100.0
0
100.0% Yes
0.0%
0
1F
Yes
No
No
100.0% Yes
0.0%
2
0
100.0% Yes
0.0%
No
Yes
No
No
Yes
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
410H
411H
412H
413H
414H
415H
416H
417H
418H
419H
A 41AH
6-
35
6
-36
Constant
Number
Name Description
H3-12
Analog input filter time constant
Sets primary delay filter time constant in seconds for the analog input terminal.
Effective for noise control etc.
Setting
Range
0.00 to
2.00
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
0.00 s
No A A A A 41BH
0.03 s
Adjusting Analog Frequency Reference Using Constants
The frequency reference is input from the control circuit terminals using analog voltage and current.
If using frequency reference terminal A1 as an input terminal, perform adjustments using constants H3-02 and
H3-03. If using multi-function analog input terminal A2 as a frequency reference terminal, perform adjustments using H3-10 and H3-11.
Adjustment can be made using H3-06 and H3-07 when multi-function analog input terminal A3 is used as a frequency reference terminal.
Frequency reference Frequency reference
(H3-06)
(H3-07) input voltage
Terminal A1, A3 input
Note: ( ) is for when terminal A3 is used.
Fig 6.28 Terminals A1 and A2 Inputs
Terminal A2 input
Terminal A2 input voltage (current)
Adjusting Frequency Gain Using an Analog Input
When H3-09 or H3-05 is set to 1 (frequency gain), you can adjust the frequency gain using the analog input terminal A2 or A3 .
Frequency gain
Multi-function analog input terminal A2 input level
Fig 6.29 Frequency Gain Adjustment (Terminal A2 Input)
Adjusting Frequency References
The frequency gain for terminal A1 is the product of H3-02 and terminal A2 gain. For example, when H3-02 is set to 100% and terminal A2 is set to 5 V, the terminal A1 frequency reference will be 50%.
Frequency reference
100% H3-02
50% H3-02 0.5
0 10 V
Terminal A1 input voltage
Adjusting Frequency Bias Using an Analog Input
When constant H3-09 or H3-05 is set to 0 (add to terminal A1), the frequency equivalent to the terminal A2 or A3 input voltage is added to A1 as a bias.
Frequency bias terminal A2 or A3 input
Multi-function analog input terminal A2 or A3 input level
Fig 6.30 Frequency Bias Adjustment (Terminal A2 or A3 or A3 Input)
For example, if H3-02 is 100%, H3-03 is 0%, and terminal A2 is set to 1 V, the frequency reference from terminal A1 when 0 V is input to A1 will be 10%.
Frequency reference
H3-02
10%
Bias
0 V 10 V
Terminal A1 input voltage
When constant H3-09 or H3-05 is set to D (frequency bias 2), the frequency equivalent to the terminal A2 or
A3 input voltage is added to A1 as a bias.
6-
37
6
-38
Operation Avoiding Resonance (Jump Frequency Function)
The jump frequency function operates the motor while avoiding resonance caused by characteristic frequencies in the machinery.
This function is effective in creating a frequency reference dead band.
During constant-speed operation, operation within the jump frequency range is prohibited. Smooth operation still used during acceleration and deceleration, i.e., jumps are not performed.
Related Constants
Constant
Number
Name Description
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register d3-01 d3-02 d3-03
Jump frequency 1
Jump frequency 2
Jump frequency 3
Set the center values of the jump frequencies in Hz.
This function is disabled by setting the jump frequency to 0 Hz.
Always ensure that the following applies: d3-01 ≥ d3-02 ≥ d3-03
Operation in the jump frequency range is prohibited but during acceleration and deceleration, speed changes smoothly without jump.
d3-04
Jump frequency width
Sets the jump frequency bandwidth in Hz.
The jump frequency will be the jump frequency ± d3-04.
* 1. When C6-01=0, the upper limit is 150.0.
* 2. When C6-01=1, the upper limit is 400.0.
0.0 to
400.0
*1
0.0 to
300.0
*2
0.0 to
20.0
0.0 Hz
0.0 Hz
0.0 Hz
1.0 Hz
No
No
No
No
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
294H
295H
296H
297H
The relationship between the output frequency and the jump frequency reference is as follows:
Output frequency
Frequency reference descending
Jump frequency width d3-04
Frequency reference ascending
Jump frequency width d3-04
Jump frequency width d3-04
Jump frequency reference
Jump frequency
3 (d3-03)
Jump frequency
2 (d3-02)
Jump frequency
1 (d3-01)
Fig 6.31 Jump Frequency
Adjusting Frequency References
Setting Jump Frequency Reference Using an Analog Input
When constant H3-09 (Multi-function Analog Input Terminal A2 Function Selection) or H3-05 (Multi-function Analog Input Terminal A3 Function Selection) is set to A (jump frequency), you can change the jump frequency using the terminal A2 or A3 input level.
Jump frequency
Max. output frequency
E1-04
0 V
(4 mA)
10 V
(20 mA)
Multi-function analog input terminal A2 or A3 input level
Fig 6.32 Jump Frequency Setting Using an Analog Input
Setting Precautions
•
•
Set the jump frequency according to the following formula: d3-01 ≥ d3-02 ≥ d3-03 > Analog input.
When constants d3-01 to d3-03 are set to 0 Hz, the jump frequency function is disabled.
6-
39
6
-40
Adjusting Frequency Reference Using Pulse Train Inputs
The frequency reference can be adjusted when b1-01 (Reference Selection) is set to 4 (Pulse Train Input). Set the pulse frequency in constant H6-02 to 100% reference, and then adjust the gain and bias accordingly using
H6-03 and H6-04.
Related Constants
Constant
Number
H6-01
H6-02
H6-03
H6-04
H6-05
Name Description
Setting
Range
Factory
Setting
Change during
Operation
V/f
Control Methods
V/f with
PG
Open
Loop
Vector
Flux
Vector
MEMO
BUS
Register
Pulse train input function selection
Pulse train input scaling
0: Frequency reference
1: PID feedback value
2: PID target value
Set the number of pulses in hertz, taking the reference to be
100%.
Pulse train input gain
Pulse train input bias
Pulse train input filter time
0 to 2
1000 to
32000
Set the input gain level as a percent when the pulse train set in
H6-02 is input.
Set the pulse train input primary delay filter time constant in seconds.
0.0 to
1000.0
Set the input bias when the pulse train is 0.
-100.0 to 100.0
0.00 to
2.00
0
1440 Hz Yes
100.0%
0.0%
0.10 s
No
Yes
Yes
Yes
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A 42CH
A 42DH
A
A
A
42EH
42FH
430H
The following diagram shows the method for adjusting the frequency reference using pulse inputs.
Pulse
RP
Cycle measurement
Filter
1
1+sT
H6-05
Gain and bias
H6-03
H6-04
0 100
=0
=1
=2
H6-01
Scaling using H6-02
Fig 6.33 Frequency Reference Adjustments Using Pulse Train Inputs
Master speed frequency
PID feedback
PID target value
