5 Basic Settings
5 - 10
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• The free V/f setting function is suitable for the applications below.
The output voltage of the inverter can be adjusted according to your application.
• In the free V/f setting, you can configure the desired V/f characteristics by setting the voltage and
frequency values at 7 points in the parameters b100 to b113.
•
The set values of the Free V/f Frequency 1 to 7 must satisfy the following relationship:
1
≤
2
≤
3
≤
4
≤
5
≤
6
≤
7.
• All of the default data are set to 0 Hz. Start by setting the Free V/f Frequency 7 (b112) and Free V/f
Voltage 7 (b113).You cannot operate the inverter with the factory default settings.
• If the free V/f settings are enabled, the Torque Boost Selection (A041/A241), Base Frequency
(A003/A203/A303), and Maximum Frequency (A004/A204/A304) functions are disabled. The Free V/f
Frequency 7 data is regarded as the maximum frequency.
Free V/f Setting
Application Adjustment method
Motor integrated with a brake (that uses
a shared power supply for the motor and
the brake)
If the motor and the brake share the same power supply, a large
voltage is required at low frequencies to release the brake.
The release timing of the brake can be adjusted by setting the
frequency at which you want to release the brake and adjusting the
voltage at that frequency.
Applications subject to significant load
variation at different motor speeds
When the load value changes significantly depending on the motor
speed (frequency), the output torque of the inverter can be adjusted
by setting the frequency at which the load value becomes large and
adjusting the voltage at that frequency.
Parameter
No.
Function name Data Description
Default
data
Unit
b100
Free V/f Frequency 1
(f1)
0. : Disabled
1. to Free V/f Frequency 2
Set the frequency at
each break point.
0Hz
b102
Free V/f Frequency 2
(f2)
0. : Disabled
Free V/f Frequency 1 to Free V/f
Frequency 3
b104
Free V/f Frequency 3
(f3)
0. : Disabled
Free V/f Frequency 2 to Free V/f
Frequency 4
b106
Free V/f Frequency 4
(f4)
0. : Disabled
Free V/f Frequency 3 to Free V/f
Frequency 5
b108
Free V/f Frequency 5
(f5)
0. : Disabled
Free V/f Frequency 4 to Free V/f
Frequency 6
b110
Free V/f Frequency 6
(f6)
0. : Disabled
Free V/f Frequency 5 to Free V/f
Frequency 7
b112
Free V/f Frequency 7
(f7)
0. : Disabled
Free V/f Frequency 6 to 400.
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