描述

ABB BRC300

变频器的容量直接关系到变频调速系统的运行可靠性，因此，合理的容量将保证最优的投资。变频器的容量选择在实际操作中存在很多误区，这里给出了3种基本的容量选择方法，它们之间互为补充。
大多数变频器容量可从3个角度表述：额定电流、可用电动机功率和额定容量。其中后两项，变频器生产厂家由本国或本公司生产的标准电动机给出，或随变频器输出电压而降低，都很难确切表达变频器的能力。
机床电器检查打开机床电控箱，检查继电器，接触器，熔断器，伺服电机速度，控制单元插座，主轴电机速度控制单元插座等有无松动，如有松动应恢复正常状态，有锁紧机构的接插件一定要锁紧，有转接盒的机床一定要检查转接盒上的插座，接线有无松动，有锁紧机构的一定要锁紧。CNC电箱检查打开CNC电箱门，检查各类接口插座，伺服电机反馈线插座，主轴脉冲发生器插座，手摇脉冲发生器插座，CRT插座等，如有松动要重新插好，有锁紧机构的一定要锁紧。按照说明书检查各个印刷线路板上的短路端子的设置情况，一定要符合机床生产厂设定的状态，确实有误的应重新设置，一般情况下无需重新设置，但用户一定要对短路端子的设置状态做好原始记录。接线质量检查检查所有的接线端子。包括强弱电部分在装配时机床生产厂自行接线的端子及各电机电源线的接线端子，每个端子都要用旋具紧固一次，直到用旋具拧不动为止，各电机插座一定要拧紧。电磁阀检查所有电磁阀都要用手推动数次，以防止长时间不通电造成的动作不良，如发现异常，应作好记录，以备通电后确认修理或更换。限位开关检查检查所有限位开关动作的灵活及固定性是否牢固，发现动作不良或固定不牢的应立即处理。按钮及开关检查操作面板上按钮及开关检查，检查操作面板上所有按钮，开关，指示灯的接线，发现有误应立即处理，检查CRT单元上的插座及接线。地线检查要求有良好的地线，测量机床地线，接地电阻不能大于1Ω。电源相序检查用相序表检查输入电源的相序，确认输入电源的相序与机床上各处标定的电源相序应绝对一致。选择变频器时，只有变频器的额定电流是一个反映半导体变频装置负载能力的关键量。负载电流不超过变频器额定电流是选择变频器容量的基本原则。需要着重指出的是，确定变频器容量前应仔细了解设备的工艺情况及电动机参数，如潜水电泵、绕线转子电动机的额定电流要大于普通笼型异步电动机额定电流，冶金工业常用的辊道用电动机不仅额定电流大很多，同时它允许短时处于堵转工作状态，且辊道传动大多是多电动机传动，应保证在无故障状态下负载总电流均不允许超过变频器的额定电流。

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主营DCS系统配件
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ABB BRC300

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