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Operation principle and hardware
description
Contents of this chapter
This chapter describes the operation principle and construction of the brake unit.
Product overview
ACS880-607 is an air-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.
Operation principle
The brake chopper handles the energy generated by a decelerating motor. The extra energy
increase the DC link voltage. The chopper connects the brake resistor to the DC link of the
drive whenever the voltage exceeds an activation limit. The energy consumption by the
resistor losses lowers the voltage until the resistor can again be disconnected.
Typically, a drive system is equipped with a brake chopper or brake choppers if
•
high capacity braking is needed and the drive cannot be equipped with a regenerative
supply unit
•
a backup for the regenerative supply unit is needed.
Simplified main circuit diagram of the drive system
This diagram shows a typical common DC bus drive system.
Operation principle and hardware description 13
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