5 Basic Settings
5 - 70
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• 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 or 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 or 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 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.
• To this function, set the Overvoltage Suppression Function Selection During Deceleration (b130) to
00 (Disabled).
5-12-2 Regenerative Braking Function
Parameter
No.
Function name Data Default data Unit
b090
Usage Rate of
Regenerative
Braking
0.0: Regenerative braking not active
0.1 to 100.0
Set the usage rate of the regenerative braking
function in units of 0.1%.
Exceeding the set usage rate causes a trip
error.
0.0 %
b095
Regenerative
Braking Selection
00: Disabled
01: Enabled (Disabled during stop)
02: Enabled (Enabled during stop)
00 –
t1 t2 t3
ON ON ON
Regenerative
braking
function activated
100 s
Usage rate [%] =
(t1 + t2 + t3)
100 s
×100
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