Selection Guide Of Braking Component; Selection Of Braking Units; Selection Power Of Braking Resistor; Chapter 7 Selection Guide Of Inverter Accessory - Danfoss VFD500 Series Manual

VFD500 high performance vector control frequency inverter user manual Chapter 7 Selection guide of inverter

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.
2
U
R =
!
P
B
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：
P = P × D
!
R B
Formula，
P
! ----Braking resistor power
R
D ---- Braking frequency (braking process accounts for the proportion of the entire process), by the load
conditions to determine the characteristics of common occasions typical values are shown in the table below：
3 、 braking components selection table
Model
VFD500-R75GT4B
VFD500-1R5GT4B
VFD500-2R2GT4B
VFD500-4R0G/5R5PT4B
VFD500-5R5G/7R5PT4B
VFD500-7R5G/011PT4B
Accessory
Table 7-1 Braking frequency of common applications
applications
elevator
Unwinding and winding
Centrifuge
Hoist and crane
General application
braking components selection table
Table 7-2 VFD500
Three phase 380V
Recommend power of
braking resistor
（10%braking
frequency）
100W
150W
300W
500W
800W
1000W
D value
20%～40%
40%～60%
40%～60%
40%～60%
10%
Recommend
resistance value of
braking resistor
≥ 200Ω
≥ 180Ω
≥ 180Ω
≥ 90Ω
≥ 60Ω
≥ 60Ω
118
Braking unit
Built-in as standard