NBRA-659C 作为模块的单相制动斩波装置

本章内容
介绍制动斩波器的工作原理和结构。
产品概述
ACS880-604是一种风冷制动斩波装置。它包括一个NBRA制动斩波模块或两个并联的NBRA制动斩波模块。
工作原理
刹车斩波器处理减速电机产生的能量。当电路中的电压超过控制程序定义的限制时，斩波器将制动电阻连接到中间直流电路。电阻器损耗的能量消耗降低了电压，直到电阻器可以断开。
通常，在以下情况下，驱动系统配备制动斩波器:
•需要高容量制动，并且驱动器不能配备再生供应单元
•需要一个备用的再生电源单元。ABB为每个制动斩波模块提供标准电阻器。

制动斩波模块必须垂直安装。模块防护等级为IP00。在选择安装地点时要考虑到这一点。
建议安装在机柜中。
遵守《ACS880多驱动模块机柜设计施工说明(3AUA0000107668[英文])》中ACS880多驱动模块机柜安装通用说明。此外，遵守以下限制:
•如果与PE(保护地)的电连接良好，可以通过安装螺钉将制动单元接地到车架上。
•制动斩波器模块下方和上方留出150mm(5.91英寸)的空闲空间。
•为保险丝和冷却风扇留出足够的空间。
•为防止模块过热，请勿将模块安装在制动电阻的正上方。
斩波器和电阻电缆的最大长度分别为5m和10m。
所需的工具
确保你有这些可用的工具:
•用合适的钻头钻孔
•带有一组合适钻头的螺丝刀和/或扳手
•安装螺钉(M6)。

NBRA-659C

Contents of this chapter
This chapter describes the operation principle and construction of the brake chopper.
Product overview
ACS880-604 is an air-cooled brake chopper unit. It includes an NBRA brake chopper module or two parallel-connected NBRA brake chopper modules.
Operation principle
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.
Typically, a drive system is equipped with a brake chopper(s) 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. Standard resistors are available from ABB for each brake chopper module.

The brake chopper module must be installed in an upright position. The degree of protection of the module is IP00. Take this into account when selecting the installation site.
Installation in a cabinet is highly recommended.
Obey the general ACS880 multidrive module cabinet installation instructions given in Cabinet design and construction instructions for ACS880 multidrive modules (3AUA0000107668 [English]). In addition, observe these restrictions:
• The brake unit can be grounded to the frame through the mounting screws if the galvanic connection to PE (protective earth) is good enough.
• Leave 150 mm (5.91 in.) free space below and above the brake chopper module.
• Leave enough space for the fuses and the cooling fan.
• To prevent the module from overheating, do not install it directly above the brake resistors.
The maximum lengths of the chopper and resistor cables are 5 m and 10 m, respectively.
Required tools
Make sure that you have these tools available:
• drill with suitable bits
• screwdriver and/or wrench with a set of suitable bits
• mounting screws (M6).