ABB ACS560 - Contents of this Chapter; Operation Principle and Hardware Description; Planning the Braking System; Resistor Braking

Resistor braking
Contents of this chapter
The chapter describes how to select the brake resistor and cables, protect the
system, connect the brake resistor and enable resistor braking.
Operation principle and hardware description
The brake chopper handles the energy generated by a decelerating motor. The
chopper connects the brake resistor to the intermediate DC circuit whenever the
voltage in the circuit exceeds the limit defined by the control program. Energy
consumption by the resistor losses lowers the voltage until the resistor can be
disconnected.
For frames R0…R3 internal brake choppers and resistors, see below. For R4…R8
external brake choppers and resistors, see Resistor braking, frames
R4…R8 (page 188) .
Resistor braking, frames R0…R3
￭
Planning the braking system
Selecting the brake resistor
Frames R0…R3 have an built-in brake chopper as standard equipment. The brake
resistor is selected using the table and equations presented in this section.
1. Determine the required maximum braking power P
Rmax
for the application.
P
Rmax
must be smaller than P
BRmax
given in the table on page for the used drive
type.
11
Resistor braking 181