Selection of Options
‑104‑
Installation Method
Figure 4‑12 Installation of the simple filter
4.1.4 Braking Components
Resistance Selection of the Braking Resistor
During braking, almost all regenerative energy of the motor is consumed by the
braking resistor. The resistance of the braking resistor is calculated by the following
formula: U×U/R=Pb.
U indicates the braking voltage at system stable braking. (U varies with systems. For
three‑phase 380–480 V, the default braking voltage of AC drive is 760 V. For single‑
phase 200–240 V, the default braking voltage of AC drive is 360V. It can be adjusted by
parameter F1‑02 of the power supply unit.)
Pb indicates the braking power.
Power Selection of the Braking Resistor
In theory, the power of braking resistor is the same as the braking power. However, in
consideration of derating K, the power of braking resistor is calculated using the
following formula: K × Pr = Pb × D.
K is set to 50% or an approximate value.
Pr indicates the power of the braking resistor.
D indicates the braking frequency (percentage of regenerative process to whole
deceleration).
The following two formulas can be obtained:
K × Pr = Pb × D = U × U/R × D
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