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7 Detailed Functions
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
7-4 Detailed Functions (Group b)
7
• The carrier frequency reduction rate is 2 kHz per second.
• The upper limit of the carrier frequency range in which this function operates is the value set in the
Carrier Frequency (b083); the lower limit of the carrier frequency range is 3 kHz.
Note This function is disabled when the Carrier Frequency (b083) is set to 3 kHz or less, independent of the b089
setting.
• When decelerating, generating downward movement, or being rotated by an external load (that is,
when the output torque direction and the rotation direction are opposite), the motor serves as a
generator and the regenerated energy is fed back to the inverter.
However, if the motor load inertia is large, the amount of regeneration may become large, which
causes an overvoltage in the inverter during rapid deceleration or when driving an elevating axis.
• The regenerative braking function uses the built-in or an external regenerative braking circuit to
decrease the internal DC voltage of the inverter by converting the regenerated energy from the motor
into heat via external braking resistors.
• Connect external braking resistors or external regenerative braking units according to the description
of External Braking Resistor Connection Terminal/Regenerative Braking Unit Connection Terminal in
2-3-4 Wiring for Main Circuit Terminals on page 2-20.
The regenerative braking function is enabled only when the inverter is connected with external
braking resistors/external regenerative braking units.
• The following models have a built-in regenerative braking circuit. Connect external braking resistors
only.
[200-V class] 3G3RX-A2004-V1 (0.4 kW) to 3G3RX-A2220-V1 (22 kW)
[400-V class] 3G3RX-A4004-V1 (0.4 kW) to 3G3RX-A4220-V1 (22 kW)
• To use models other than the above or process a very large amount of regenerative energy, you need
to use regenerative braking units.
• To use the built-in regenerative braking function of the inverter, set the Regenerative Braking
Selection (b095) to 01 or 02 (Enabled).
Normally, this parameter is set to 01 (Enabled: Disabled during stop).
At this time, set the usage condition [%] of the braking resistor in use in the Usage Rate of
Regenerative Braking (b090).
Note that the regenerative braking function is enabled only when both b090 and b095 are set.
• For the Regenerative Braking ON Level (b096), you need not change the default data normally.
This parameter is used for adjusting the level at which the regenerative braking function operates
according to the input power supply voltage.
• External regenerative braking units are processed on the external regenerative braking unit side.
Therefore, set the Regenerative Braking Selection (b095) to 00 (Disabled). In this case, the b090 and
b096 settings are ignored.
Regenerative Braking Function
15.0 kHz
60%
Output current [%]
Carrier frequency
12.0 kHz
9.0 kHz
6.0 kHz
3.0 kHz
72% 84% 96%
0 10050
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