在工业和民用上都有很多的电机拖动系统,例如:风扇、水泵、机床、卷绕机、电梯、传送带、起重机、卷扬机、注塑机等。
大多数场合使用V/F控制就可以达到控制要求,然而也有一些场合在使用V/F控制容易出现过载,例如在低速大转矩输出的场合,那我们可以考虑采用矢量控制方式解决过载问题。
本文就用FR-E840-0120(5.5K)为例,来告诉大家如何进行先进磁通矢量控制的调试。
电机额定功率:4.0KW
电机额定电流:8.8A
电机额定电压:380V
电机额定频率:50Hz
电机极数:4
●PR9=电子过热保护(设定电机额定电流8.8A)
●PR71=适用电机(设定3 标准电机)
●PR80=电机容量(设定适用的电机容量4.0KW)
●PR81=电机极数(设定电机极数4)
●PR83=电机额定电压(设定电机额定电压380V)
●PR84=电机额定频率(设定电机额定频率50HZ)
●PR800=控制方法选择(设定20 先进磁通矢量控制)
●PR96=自动调谐设定(设定1离线自动调谐)
以面板操作为例,按上述顺序设定参数后,进入监视状态后面板显示“1”,接下来按"RUN”按钮,面板显示会从“1”变化为“2” (同时可听到电机嗡嗡的声音,说明调谐正常) ,大约经过30S~1min后,直到面板显示为“3”,此时自学习结束,按复位键“STOP/RESET”即可,具体操作步骤请参考图所示:
此时可以查看以下一些参数的变化,初始值是9999,如果不是9999那说明参数已调整:
● Pr.82 (电机励磁电流)
● Pr.90 (电机常数R1)
● Pr.91 (电机常数R2)
● Pr.92 (电机常数L1)
● Pr.93 (电机常数L2)
● Pr.94 (电机常数X)
?先进磁通矢量控制方式通常应用在速度控制要求较高的场合,例如空压、卷扬设备,低速转矩较高等;
?磁通矢量控制要求一拖一;
?自学习时,变频器与电机容量之间差别太大,容易导致“98”报警;
?先进磁通矢量控制,在0.5Hz时,转矩输出可达到150%;
?当Pr.80或Pr.81=“9999”时,与Pr.800的设定值无关,控制方式均为V/F控制。
(注:本文为“海亿自动化”原创文稿,如需转载,请标明出处并附上原文链接。)
更多内容说明或案例详情可留言或来电咨询哦~
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