Inovance MD500T75G - Page 244

9. Peripherals and Options MD500 User Manual
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Selection of Resistance of Regen Resistor
The AC drive transfers the regenerative energy generated during the braking of the motor to the externally mounted regen resistor.
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ƕ U refers to the braking voltage at system stable braking.
ƕ The U value varies with the system. The 380 VAC system usually selects 700 V braking voltage.
ƕ Pb refers to the braking power.
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Selection of Power of Regen Resistor
In theory, the power of the regen resistor is the same as the braking power. But in consideration of de-rating, the power of the
regen resistor is calculated from the following formula:
K × Pr = Pb × D
ƕ K ranges from 15% to 30%.
ƕ Pr refers to the power of the regen resistor.
ƕ D refers to the braking frequency (percentage of the regenerative process to the whole deceleration).
Application Elevator Winding & unwinding Centrifuge Occasional braking load General Application
Braking Frequency 20% to 30% 20% to 30% 50% to 60% 5% 10%
Note
The preceding table is for reference only. You can select the resistance and power of the regen resistor based on
actual needs. However, the resistance must not be lower than the reference value. The power may be higher than the
reference value. Selection of the regen resistor model is determined by the generation power of the motor and is also
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