Chapter 7 Selection Guide Of Inverter Accessory - Veikong VFD500 Series User Manual

VFD500 high performance vector control frequency inverter user manual Appendix A Modbus communication protocol

Chapter 7 Selection Guide of inverter Accessory

Selection Guide of braking component
7.1
The braking resistor is used to consume the energy fed back by the motor to the inverter during braking or generating
operation, so as to achieve quick braking or prevent the inverter from reporting the main circuit overvoltage fault.
Braking resistor selection has two parameters: resistance and power, under normal circumstances, the greater the
system inertia, the need for deceleration time is shorter, the more frequent braking, the braking resistor selection
should be greater power , The smaller the resistance.
1、Selection of braking units
When braking, almost all the renewable energy of motor is consumed on the braking resistor.
Formula：
U --- The braking voltage when the system brakes stably (Different models have different values. Models
with built-in braking unit can be set by P22.12)
R - Braking resistor
Pb – Braking Power
2 、 Selection power of braking resistor
Braking resistor power can be calculated according to the following formula：
Formula，
----Braking resistor power
Model
VFD500-R75GT4B
VFD500-1R5GT4B
VFD500-2R2GT4B
VFD500-4R0G/5R5PT4B
VFD500-5R5G/7R5PT4B
VFD500-7R5G/011PT4B
VFD500-011G/015PT4B
VFD500-015G/018PT4B
VFD500-018G/022PT4B
VFD500-022G/030PT4B
VFD500-030G/037PT4
VFD500-037G/045PT4
VFD500-045G/055PT4
VFD500-055G/075PT4
VFD500-075G/090PT4
Three phase 380V
Recommend power of
braking resistor resistance value of
（10%braking
100W
frequency）
150W
300W
500W
800W
1000W
1.2KW
1.5KW
2.0KW
2.5KW
3.0KW
3.7 KW
4.5 KW
5.5 KW
7.5 KW
- 131-
Recommend
braking resistor
≥ 200Ω
≥ 180Ω
Built-in as standard
≥ 180Ω
≥ 90Ω
≥ 60Ω
≥ 60Ω
≥ 25Ω
≥ 25Ω
≥ 18Ω
Built-in as option
≥ 18Ω
≥ 12Ω
≥ 15Ω
≥ 8Ω
≥ 6Ω
≥ 6Ω
Braking unit