Chapter 7 Selection Guide of inverter Accessory
7.1 Selection Guide of braking component
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
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：
Table 7-1 Braking frequency of common applications
3 、braking components selection table
Table 7-2 VFD500 braking components selection table
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