User`s manual

56
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%.
Note 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%.
• 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.
n30 Frequency Reference Upper Limit Changes during
operation
No
Setting
range
0% to 110%
(Max. frequency = 100%)
Unit of
setting
1% Default setting 100
n31 Frequency Reference Lower Limit Changes during
operation
No
Setting
range
0% to 110%
(Max. frequency = 100%)
Unit of
setting
1% Default setting 0
n41 Frequency Reference Gain Changes during
operation
Yes
Setting
range
0% to 255%
(Max. frequency = 100%)
Unit of
setting
1% Default setting 100
n42 Frequency Reference Bias Changes during
operation
Yes
Setting
range
-99% to 99%
(Max. frequency = 100%)
Unit of
setting
1% Default setting 0
n43 Analog Frequency Reference Filter Time Changes during
operation
No
Setting
range
0.00 to 2.00 (s) Unit of
setting
0.01 s Default setting 0.10