Option Selection
‑147‑
Installation Method
Figure 4‑29 Simple filter installation
4.3.5 Braking Components
Selection of braking resistor resistance
During braking, almost all the regenerative energy of the motor is dissipated by the
braking resistor. The resistance of the braking resistor is calculated according to the
following formula: U x U/R = Pb.
U: Braking voltage used to stabilize the system braking (The value of U varies with
systems. The default braking voltage of the MD580 AC drive is 760 V, which can be
adjusted through F9‑08.)
Pb: Braking power
Selection of braking resistor power
In theory, the power of the braking resistor is the same as the braking power.
However, in consideration of the derating coefficient K, the power of the braking
resistor is calculated by the following formula: K x Pr = Pb x D.
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