Product Information VD520 Series Inverter User Manual
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2.8 Braking Unit Model Selection Guide
2.8.1 Resistor Value Selection
The regenerative energy of the motor is almost all consumed in the braking resistor when braking.
According to formula U*U/R=Pb
In formula U---braking voltage when system is stability braking (different system with different value,
for AC380V system, it generally take DC700V)
Pb----braking power
2.8.2 Braking Resistor Power Selection
Theoretically, braking resistor power is the same with braking power, but in consideration that the
de-rating is 70%,
According to formula: 0.7Pr=Pb*D
Pr----power of resistor
D----braking frequency (percentage of regenerating process account for the complete process)
Elevator----20%~30%
Uncoiling and recoiling----20%~30%
Centrifuge----50%~60%
Accidental braking loading----5%
General take 10%
Table 2-4 Inverter braking unit selection
Model
Recommend
Power Braking
Resistor
Recommend
Resistance
Braking
Resistor
Braking Unit
Remarks
Single-phase 220V 50/60Hz
VD500-2S-0.7GB
80W
≥150Ω
VD500-2S-1.5GB
100W
≥100Ω
VD500-2S-2.2GB
100W
≥70Ω
VD500-2S-3.7GB
200W
≥40Ω
VD500-2S-5.5GB
300W
≥25Ω
Internal
No special
instructions
Three-phase 380V 50/60Hz
VD500-4T-0.7GB
150W
≥300Ω
VD500-4T-1.5GB
150W
≥220Ω
VD500-4T-2.2GB
250W
≥200Ω
VD500-4T-3.7GB/5.5PB
300W
≥130Ω
VD500-4T-5.5GB/7.5PB
400W
≥90Ω
VD500-4T-7.5GB/11PB
500W
≥65Ω
VD500-4T-11GB/15PB
800W
≥43Ω
VD500-4T-15GB/18.5PB
1000W
≥32Ω
Internal
No special
instructions
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