Operation principle and hardware
description
Contents of this chapter
This chapter describes a typical drive system and the operation principle and construction
of the brake chopper module.
Product overview
The ACS880-604 is an air-cooled brake unit as modules. The brake unit as modules range
contains components for building the brake unit(s) to be used in a common DC bus system
drive. The brake unit as modules includes a brake chopper module or several
parallel-connected brake chopper modules. The brake chopper module is actually a
three-phase inverter module (ACS880-104) that is connected and controlled in a particular
way: the input of the module is connected to the DC bus – like in the inverter use – but each
output phase connects to a resistor of its own.
Operating 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 resistors 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 resistors can be
disconnected.
When to use resistor braking
Typically, a drive system is equipped with a brake chopper if
•
high capacity braking is needed and the drive cannot be equipped with a regenerative
supply unit
2
Operation principle and hardware description 15
Содержание ACS880-604
Страница 1: ... ABB INDUSTRIAL DRIVES ACS880 604 3 phase brake units as modules Hardware manual ...
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Страница 34: ...Overview of kits 34 Cabinet construction ...
Страница 35: ...Stage 1 Installation of common parts Cabinet construction 35 10 ...
Страница 36: ...Stage 2A Installation of DC busbars 1 without DC switch or charging 36 Cabinet construction ...
Страница 37: ...Stage 2B Installation of DC busbars 1 with DC switch and charging Cabinet construction 37 10 ...
Страница 38: ...Stage 3 Installation of quick connector and outgoing resistor busbars cable connection 38 Cabinet construction ...
Страница 39: ...Stage 4 Installation of incoming resistor busbars cable connection Cabinet construction 39 10 ...
Страница 40: ...Stage 5 Installation of mounting plates and cable entries 40 Cabinet construction ...
Страница 41: ...Stage 6 Installation of support plate Cabinet construction 41 10 ...
Страница 42: ...Stage 7 Installation of shrouding 42 Cabinet construction ...
Страница 43: ...Stage 8 Installation of brake chopper module Cabinet construction 43 10 ...
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Страница 112: ...Frame R8i 112 Dimension drawings ...
Страница 113: ...Dimension drawings 113 ...
Страница 114: ...Control electronics BCU control unit 114 Dimension drawings ...
Страница 123: ...Miscellaneous components Quick connector for frame R8i Dimension drawings 123 ...
Страница 124: ...124 Dimension drawings ...
Страница 125: ... Insertion extraction ramp for frame R8i modules Dimension drawings 125 ...
Страница 126: ...126 Dimension drawings ...
Страница 127: ... CRBB 4 400 188 cooling fan 218 Dimension drawings 127 ...
Страница 128: ...128 Dimension drawings ...