4-28
n38
Automatic Torque Boost Gain
Setting range 0.0 to 3.0 Factory setting 1.0
Unit of setting 0.1
•There is no need to set this constant during the usual operation of the Inverter.
•Set this constant to a large value if the wiring distance between the motor and Inverter
is large. Set this constant to a small value if the motor vibrates.
n39
Frequency Reference Gain
Setting range 0.10 to 2.55
(times)
Factory setting 1.00 (times)
Unit of setting 0.01 (times)
n40
Frequency Reference Bias
Setting range –99 to 99 (%) Factory setting 0 (%)
Unit of setting 1 (%)
•These constants are used to set the relationship between analog voltage and refer-
ence frequencies when frequency references are input through control terminals FR
and FC.
•Frequency Reference Gain (n39): Specify the input voltage corresponding to the maxi-
mum frequency (n24) as a multiple of 10 V.
•Frequency Reference Bias (n40): Specify the reference frequency corresponding to
input voltage 0 V as a percentage of the maximum frequency (n24).
Example of Frequency Reference Gain and Bias
Reference frequency
Maximum frequency
Target value
Target value b[V]
Input voltage
0 V 10 V
n40 +
a
n24
100
n39 +
b
10
a[Hz]
Preparing for Operation Chapter 4
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