Resistor Braking; Contents Of This Chapter; Operation Principle And Hardware Description; Resistor Braking, Frames R0 - ABB ACS560 Hardware Manual

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 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
be smaller than P
2. Calculate resistance R with Equation 1.
3. Calculate energy E
4. Select the resistor so that the following conditions are met:
• The rated power of the resistor must be greater than or equal to P
Resistor braking, frames R4...R8 (page 146)
given in the table on page for the used drive type.
BRmax
with Equation 2.
Rpulse
Resistor braking 141
11
for the application. P
Rmax
Rmax
.
must
Rmax
.