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1791-24A8模块
1791-24A8模块
1791-24A8模块
变频器的安装:在安装过程中,技术保障是的,要严格按照使用说明,远离热源(环境温度不超过40℃)注意防潮,保证安装通风散热(尤其是外接制动电阻和制动单元),并充分考虑干扰问题,如我厂石灰石破碎喂料、各风机、水泵、回转窑、生料磨等调速环节,变频器安装相对分散,相互之间的干扰小,不影响正常使用,而在某些生产环节如生熟料配料系统,要求多台变频器安装在电控室同一个控制屏内,因为变频器本身是一个强干扰源,工作时产生高次谐波,相互之间以及对主控设备仪表等产生干扰,影响系统正常运行,而控制系统信号传输多为低压(O一5V)直流方式,采用有关抗千扰措施,以保系统正常工作。在同一控制柜内的接触器电磁阀等线圈应并接RC浪涌吸收器,吸收器的接线不能超过20c低否则会起到天线作用,来自工频电网的干扰可连接进线电抗器予以抑制,还可防止变频器对电网造成谐波污染。
经实践证明,生产现场条件较好的,除严格按要求对干扰源做好屏蔽外,控制信号传输应采用电流仔-2OmA)方式,可有效降低干扰对系统的影响,对生产现场条件较差的,除用屏蔽线作为与变频器采样及控制信号的连接外,并对信号线屏蔽网做好单独的专门接地,可有效抑制干扰。
变频器按其控制方式的不同可分为通用型和工程型两大类。通用型变频器一般采用Uf/曲线控制方式,在电机高速运转时,气隙磁通小基本恒定,则可满足设备恒功率(或恒转矩)的运行特性。但在低速时,由于气隙磁通中下降,难以满足恒功率要求,通用型变频器一般采用给定闭环控制方式,动态响应速度相对较慢。而工程型变频器则在其内部通过检测自动补偿、自动限制的环节,在设备低速运转时也可保持好的转矩特性,可实现真正意义上的闭环控制。
工程型变频器通常有三种控制方式可选:①开环控制方式,同通用型;②带转差补偿,即当负载突降时,则给定可自动补偿;③带模拟、数字测速机,可完全实现闭环控制。
安装形式有:①固定式(壁挂式),功率多在3k7w以下;②书本型,功率从20一73k从,占用空间相对较小,安装时可紧密排列;③装机/装柜型,功率45一200kw,需要附加电路及整体机壳占用空间较大;④柜型,控制功率为45一500kw,除具备装机/装柜型特点外,与之比较占用空间更大。选择时可根据受控电机功率及现场安装条件选用合适类型。
电压及防护等级和调速范围:变频器的电压等级有IAC23OV;也有3AC208一230V、380一460勺、5)(0一575V、660一69OV等级,防护等级IPOO一IP54,应根据具体情况做出合适的选择,从调速范围及精度要求而言,变频器有FC(频率控制),调速范围1:100一IOOO;SC(矢量控制),调速范围:14000一l1000;我们一般选用FC方式即可满足生产要求。
一般小功率变频器内部都装有制动电阻,系统惯性不大或制动时间不需很短的,可不必加外接电阻,对惯性较大且需频繁调速或制动时间要求短的,不论功率大小都要加合适功率的外接制动电阻或制动单元。
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