Resistor Braking; Contents Of This Chapter; Operation Principle And Hardware Description; Planning The Braking System - ABB ACS880-07 Hardware Manual

Resistor braking

Contents of this chapter

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

Operation principle and hardware description

The drive can be equipped with optional built-in brake chopper (+D150). Brake resistors
are available as add-on kits or factory installed (+D151).
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.

Planning the braking system

Selecting the brake circuit components


1. Calculate the maximum power generated by the motor during braking (P
2. Select a suitable drive, brake chopper and brake resistor combination for the
application from the rating table on page 227. The braking power of the chopper must
be greater or equal than the maximum power generated by the motor during the
braking.
Resistor braking 223
16
).
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