5-141
5-10 Brake Settings
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
5
Functions
Regenerative Braking Function
During deceleration, the motor functions as a generator and the generated energy is returned
to the Inverter. As a result, the Inverter's DC voltage rises and if the overvoltage level is
exceeded, an overvoltage (OV) trip occurs.
This function is intended to prevent this problem by allowing the regenerative energy to be
consumed using an external Resistor. It is effective if you want to quickly decelerate the motor
or when the load inertia is large.
All 3G3MX2 models have a built-in regenerative braking circuit, so install only a Braking
Resistor externally to the Inverter. To use the Regenerative Braking Unit, set Regenerative
Braking Selection (b095) to "00: Disabled."b090 and b096 will be ignored.
To use the regenerative braking function, set the following conditions.
Parameter
No.
Function
name
Data
Default
setting
Unit
b090
Usage Rate
of
Regenerative
Braking
0.0
Regenerative braking does not operate.
0.0 %
0.1 to 100.0
The usage rate of regenerative braking can be set in
increments of 0.1%.
A trip occurs if the set usage rate is exceeded.
b095
Regenerative
Braking
Selection
00: Disabled
00 −
01
While operating: Enabled (Regenerative braking
operates.)
While stopped : Disabled (Regenerative braking does
not operate.)
02: Enabled while operating and stopped
(Regenerative braking operates.)
b096
Regenerative
Braking ON
Level
330 to 380
*1
(200 V class) 360
V
660 to 760
*1
(400 V class)
720
*1.The regenerative braking ON level conforms to the output voltage setting for the Inverter's internal
converter (DC unit). The regenerative braking circuit turns ON when the set voltage is exceeded. When
the Resistor consumes the energy and the voltage drops to below the ON level, the regenerative
braking circuit turns OFF.
Regenerative
braking operation
Usage rate (%) =
(t1+t2+t3)
100 sec.
100 sec.
100
t1
t2
t3
ON ON ON
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