Omron RX Series User Manual page 206

5 Basic Settings
Free V/f Setting
• 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.
Application
Motor integrated with a brake (that uses
a shared power supply for the motor and
the brake)
Applications subject to significant load
variation at different motor speeds
• 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.
Parameter
No.
Free V/f Frequency 1
b100
(f1)
Free V/f Frequency 2
(f2)
b102
Free V/f Frequency 3
(f3)
b104
Free V/f Frequency 4
(f4)
b106
Free V/f Frequency 5
(f5)
b108
Free V/f Frequency 6
(f6)
b110
Free V/f Frequency 7
b112
(f7)
5 - 10
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.
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.
Function name
0. : Disabled
1. to Free V/f Frequency 2
0. : Disabled
Free V/f Frequency 1 to Free V/f
Frequency 3
0. : Disabled
Free V/f Frequency 2 to Free V/f
Frequency 4
0. : Disabled
Free V/f Frequency 3 to Free V/f
Frequency 5
0. : Disabled
Free V/f Frequency 4 to Free V/f
Frequency 6
0. : Disabled
Free V/f Frequency 5 to Free V/f
Frequency 7
0. : Disabled
Free V/f Frequency 6 to 400.
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
Adjustment method
Data Description
Set the frequency at
each break point.
Default
Unit
data
0 Hz