Product Information VD560 Series Inverter User Manual
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2.8 Braking Unit Model Selection Guide
2.8.1 Resistor Value Selection
When braking, the regenerative energy of the motor is almost all consumed in the braking resistor.
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
VD560-2S-0.7GB
153W
≥150Ω
VD560-2S-1.5GB
306W
≥100Ω
VD560-2S-2.2GB
450W
≥70Ω
VD560-2S-3.7GB
728W
≥40Ω
VD560-2S-5.5GB
1120W
≥25Ω
Internal
No special
instructions
Three-phase 380V 50/60Hz
VD560-4T-0.7GB
153W
≥300Ω
VD560-4T-1.5GB
306W
≥220Ω
VD560-4T-2.2GB
450W
≥200Ω
VD560-4T-3.7GB
728W
≥130Ω
VD560-4T-5.5GB
1120W
≥90Ω
VD560-4T-7.5GB
1500W
≥65Ω
VD560-4T-11GB
2200W
≥43Ω
VD560-4T-15GB
3000W
≥32Ω
Internal
No special
instructions
VD560-4T-18.5G
3.7kW
≥31.5Ω
External
VDBU-4T-70G
