Setting the Frequency Reference
Chapter 5-5
5-5 Setting the Frequency Reference
5-5-1 Selecting the Frequency Reference
The following description provides information on how to set the frequency reference in the Inverter. Select the method according to the operation mode.
Remote mode: Select and set one out of six frequency references in n03.
Local mode: Select and set one out of two frequency references in n07.
Selecting the Frequency Reference (n03) in Remote Mode
• Select the input method of frequency references in remote mode.
• Five frequency references are available in remote mode. Select one of them according to the application.
n03 Frequency Reference Selection No
Setting range
0 to 4, 6 Unit of setting
1
Changes during operation
Default setting 0
3
4
6
0
1
2
Set Values
Value Description
The FREQ adjuster of the Digital Operator is enabled. (see note 1)
Frequency reference 1 (n21) is enabled.
The frequency reference control terminal (for 0- to 10-V input) is enabled. (see note 2)
The frequency reference control terminal (for 4- to 20-mA current input) is enabled. (see note 3)
The frequency reference control terminal (for 0- to 20-mA current input) is enabled. (see note 3)
The frequency reference via RS-422A/485 communications is enabled.
Note 1.
The maximum frequency (FMAX) is set when the FREQ adjuster is set to
MAX.
2.
The maximum frequency (FMAX) is set with 10 V input.
3.
The maximum frequency (FMAX) is set with 20 mA input, provided that
SW8 on the control PCB is switched from V to I.
The frequency reference set in n03 works as frequency reference 1 when the
Inverter is in multi-step speed operation. The set values in n22 through n28 for frequency references 2 through 8 are enabled.
Selecting the Frequency Reference (n07) in Local Mode
• Select the input method of frequency references in local mode.
• Two frequency references are available in local mode. Select one of them according to the application.
n07 Frequency Reference Selection in Local Mode No
Setting range
0, 1 Unit of setting
1
Changes during operation
Default setting 0
Set Values
Value
0
1
Description
The FREQ adjuster of the Digital Operator is enabled. (see note 1)
Key sequences on the Digital Operator are enabled. (see note 2)
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Setting the Frequency Reference
Chapter 5-5
5-5-2 Upper and Lower Frequency Reference Limits
Regardless of the methods of operation mode and frequency reference input, the upper and lower frequency reference limits can be set.
Setting the Frequency Reference Upper and Lower Limits (n30 and n31)
• Set the upper and lower frequency reference limits as percentage based on the maximum frequency as 100%.
n30 Frequency Reference Upper Limit No
Setting range
0% to 110%
(Max. frequency = 100%)
Unit of setting
1%
Changes during operation
Default setting 100 n31
Setting range
Frequency Reference Lower Limit Changes during operation
Default setting 0
No
0% to 110%
(Max. frequency = 100%)
Note
Unit of setting
1%
If n31 is set to a value less than the minimum output frequency (FMIN), the
Inverter will have no output when a frequency reference less than the minimum output frequency input is ON.
5-5-3 Adjusting the Analog Input
Input characteristic adjustments may be necessary for analog frequency references to be input. At that time, use the following parameters for gain, bias, and filter time parameter adjustments.
FR Terminal Adjustments for Frequency Reference Input
Gain and Bias Settings
(n41 and n42)
• Set the input characteristics of analog frequency references in n41 (for the frequency reference gain) and n42 (for the frequency reference bias).
• Set the frequency of maximum analog input (10 V or 20 mA) in n41 as percentage based on the maximum frequency as 100%.
• Set the frequency of minimum analog input (0 V, 0 mA, or 4 mA) in n42 as percentage based on the maximum frequency as 100%.
n41
Setting range
Frequency Reference Gain
0% to 255%
(Max. frequency = 100%)
Unit of setting
1%
Changes during operation
Default setting 100
Yes n42
Setting range n43
Setting range
Frequency Reference Bias Changes during operation
Default setting 0
Yes
-99% to 99%
(Max. frequency = 100%)
Unit of setting
1%
• Analog Frequency Reference Filter Time (n43)
• The digital filter with a first-order lag can be set for analog frequency references to be input.
• This setting is ideal if the analog input signal changes rapidly or the signal is subject to noise interference.
• The larger the set value is, the slower the response speed will be.
Analog Frequency Reference Filter Time No
0.00 to 2.00 (s) Unit of setting
0.01 s
Changes during operation
Default setting 0.10
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n26
Setting range n27
Setting range n28
Setting range n22
Setting range n23
Setting range n24
Setting range n25
Setting range
Setting the Frequency Reference
Chapter 5-5
5-5-4 Setting Frequency References through Key Sequences
The following description provides information on parameters related to frequency reference settings through key sequences on the Digital Operator
Setting Frequency References 1 through 8 and the Inching Frequency
Command (n21 through n28 and n29)
A total of nine frequency references (frequency references 1 through 8) and an inching frequency command can be set together in the Inverter.
Setting Frequency References 1 through 8 (n21 through n28) n21
Setting range
Frequency Reference 1
0.0 to max. frequency Unit of setting
0.01 Hz
(see note 1)
Changes during operation
Default setting 6.0
Yes
Frequency Reference 2
0.0 to max. frequency Unit of setting
Frequency Reference 3
0.0 to max. frequency Unit of setting
Frequency Reference 4
0.0 to max. frequency Unit of setting
Frequency Reference 5
0.0 to max. frequency Unit of setting
Frequency Reference 6
0.0 to max. frequency Unit of setting
Frequency Reference 7
0.0 to max. frequency Unit of setting
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
Yes
Yes
Yes
Yes
Yes
Yes
Note
Frequency Reference 8
0.0 to max. frequency Unit of setting
0.01 Hz
(see note 1)
Changes during operation
Default setting 0.0
Yes
1.
Values will be set in 0.1-Hz increments if the frequency is less than 100 Hz and 1-Hz increments if the frequency is 100 Hz or over.
2.
Frequency reference 1 is enabled with n03 for frequency reference selection set to 1.
3.
Frequency references 2 through 8 are enabled by setting multi-step speed references 1, 2, and 3 in n36 through n39 for multi-function input. Refer to the following table for the relationship between multi-step speed references
1 through 3 and frequency references 1 through 8.
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Setting the Frequency Reference
Chapter 5-5
Frequency reference
Frequency reference 1
Frequency reference 2
Frequency reference 3
Frequency reference 4
Frequency reference 5
Frequency reference 6
Frequency reference 7
Frequency reference 8
No multi-step speed reference 3 settings will be required if only frequency references 1 through 4 are used, for example. Any multi-step speed reference not set is regarded as turned-OFF input.
Setting the Inching Frequency Command (n29)
The inching frequency command must be set as multi-function input in order to use the inching frequency command.
n29
Setting range
Inching Frequency Command
0.0 to max. frequency Unit of setting
0.01 Hz
(see note 1)
Changes during operation
Default setting 6.0
Yes
Note
OFF
Multi-step speed reference 1
(Set value: 6)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Multi-step speed reference 2
(Set value: 7)
OFF
ON
ON
OFF
OFF
ON
ON
OFF
Multi-step speed reference 3
(Set value: 8)
OFF
OFF
OFF
ON
ON
ON
ON
1.
The value will be set in 0.1-Hz increments if the frequency is less than 100
Hz and 1-Hz increments if the frequency is 100 Hz or over.
2.
In order to use the inching frequency command, one of the n36 through n39 parameters for multi-function input must be set to 10 as an inching frequency command. Parameter n29 is selectable by turning on the multifunction input set with the inching frequency command. The inching frequency command takes precedence over the multi-step speed reference (i.e., when the inching frequency command is ON, all multi-step speed reference input will be ignored).
58
Setting the Frequency Reference
Chapter 5-5
Setting the Frequency Reference with the FREF Indicator Lit
The frequency reference can be set while the FREF indicator of the Digital
Operator is lit in the following cases.
• Parameter n03 for frequency reference selection is set to 1, which enables frequency reference 1, and the Inverter is in remote mode.
• Parameter n07 for frequency selection in local mode is set to 1, which enables key sequences on the Digital Operator, and the Inverter is in local mode.
• Frequency references 2 through 8 are set with multi-step speed reference input.
The frequency reference can be changed, even during operation.
When the frequency reference is changed while the FREF indicator is lit, the corresponding parameter is changed simultaneously. For example, if frequency reference 2 has been selected with multi-function input (a multistep speed reference), the set value in n22 (for frequency reference 2) will be changed simultaneously when the frequency reference is changed while the
FREF indicator is lit.
Take the following default steps, for example, to change the frequency reference with the FREF indicator lit.
Key sequence
Indicator Display example
Power On
Explanation
Note If the FREF indicator has not been lit, press the Mode Key repeatedly until the FREF indicator is lit.
Use the Increment or Decrement Key to set the frequency reference.
The data display will flash while the frequency reference is set.
Press the Enter Key so that the set value will be entered and the data display will be lit.
Setting the Key Sequential
Frequency (n08) n08
• The Enter Key need not be pressed when changing the setting in n08. In that case, the frequency reference will change when the set value is changed with the Increment or Decrement Key while the data display is continuously lit.
Key Sequential Frequency Setting No
Setting range
0, 1 Unit of setting
1
Changes during operation
Default setting 0
Set Values
Value
0
1
Description
Enter Key enabled (The set value is entered with the Enter Key pressed.)
Enter Key disabled (The set value set is entered immediately.)
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