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Operation principle and hardware description 15
2
Operation principle and hardware
description
Contents of this chapter
This chapter describes the operation principle and construction of the brake unit.
Product overview
ACS880-607LC is a liquid-cooled cabinet-installed brake unit, which forms a part of an
ACS880 multidrive system. As standard, it includes brake chopper(s). Brake resistors are
external, and customer must acquire and install them separately.
Operation principle
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.
When is resistor braking necessary?
Resistor braking is necessary for high capacity braking if a regenerative drive cannot be
used.
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