Omron RX Series - Page 362

7 Detailed Functions
7 - 36
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). You cannot
operate the inverter with the factory default settings.
• If the free V/f settings are enabled, the 1st/2nd Torque Boost Selection (A041/A241), 1st/2nd/3rd
Base Frequency (A003/A203/A303), and 1st/2nd/3rd 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, 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.