Protection parameter group 06
PARAMETER DESCRIPTION 112
5.7.3 Regenerative brake
When performing frequent start and stop operation, regenerative brake usage rate can be increased by using the
brake resistor or the brake unit.
Regenerative brake
selection
Brake duty is fixed at 3%, parameter 06-06(P.70) will be off.
Brake duty is 06-06(P.70) value.
Special
regenerative brake
duty
Regenerative brake
During the period when output frequency of inverter changes from high frequency to low frequency, due to load
inertia, the rotating speed of the motor is higher than the output frequency of inverter at an instant, thus forming the
generator effect. This will cause regenerative voltage between main circuit terminals, which may result in damage
to inverter. Therefore, a regenerative braking resistor with an appropriate size is installed between main circuit
terminals +/P and PR to absorb the feedback energy.
There is a transistor in inverter and the proportion of conduction time is called “regenerative braking duty”. The
greater the value of regenerative braking duty, the more energy regenerative braking resistor consumes and the
stronger the braking capability.
Note: 1. If inverter is used in high-frequency start/stop case, it need a high-power regenerative braking resistor.
2. Please refer to section 3.6.3 for choosing regenerative braking resistor.
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