Resistor Braking; Contents Of This Chapter; Operation Principle And Hardware Description; Planning The Braking System - ABB ACS880-34 Series Hardware Manual

Resistor braking

Contents of this chapter

This chapter describes how to select, protect and wire brake choppers and resistors. The
chapter also contains the technical data.

Operation principle and hardware description

Brake choppers and resistors are available as add-on kits for the drive modules.
The brake chopper handles the energy generated by a decelerating motor. The extra energy
increases the DC link voltage. 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.

Planning the braking system

￭ Selecting the default brake circuit components - ABB chopper and
ABB resistor
1. Calculate the maximum power generated by the motor during braking and define the
braking cycle.
2. Select a drive according to motor load cycle considering also the braking cycle. See
the drive ratings.
Resistor braking 227
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