描述
如果变频器周围存在干扰源,它们将通过辐射或电源线侵入变频器的内部,引起控制回路误动作,造成工作不正常或停机,严重时甚至损坏变频器。减少噪声干扰的具体方法有:变频器周围所有继电器、接触器的控制线圈上,加装防止冲击电压的吸收装置,如RC浪涌吸收器,其接线不能超过20cm;尽量缩短控制回路的配线距离,并使其与主回路分离;变频器控制回路配线绞合节距离应在15mm以上,与主回路保持10cm以上的间距;变频器距离电动机很远时(超过100m),这时一方面可加大导线截面面积,保证线路压降在2%以内,同时应加装变频器输出电抗器,用来补偿因长距离导线产生的分布电容的充电电流。(http://www.diangon.com/版权所有)变频器接地端子应按规定进行接地,必须在专用接地点可靠接地,不能同电焊、动力接地混用;变频器输入端安装无线电噪声滤波器,减少输入高次谐波,从而可降低从电源线到电子设备的噪声影响;同时在变频器的输出端也安装无线电噪声滤波器,以降低其输出端的线路噪声。 变频器的生产厂家在设计或制造变频器时,其内部印制板、金属件等构件的材料很多都未经过防潮湿和防霉变的处理。如果此类变频器长期在潮湿的环境下工作,就容易导致变频器内部的金属构件发生锈蚀,特别是导电铜排在高温情况下运行,更会加剧锈蚀的发生。本文介绍了如何防止变频器备件的防潮湿霉变:变频器发生锈蚀之后很容易降低使用寿命或造成彻底损坏,特别是变频器内部的微机控制板和驱动电源板上的细小铜质导线,最易发生锈蚀。变频器如果需要在潮湿的环境中工作,则需要对内部的部件进行防潮湿、防霉变处理,以应对锈蚀的发生。变频器的防潮湿和防霉变处理方法有很多,例如在印刷电路板是对其进行三防漆喷涂处理,或在处理结构件时使用镀镍铬等工艺处理。变频器的控制柜对变频器的防潮湿和防霉变也有一定的作用,例如采用防尘控制柜。变频器的控制柜可以采用防尘设计,包括采用防护网、防尘网和防护顶盖出风口等。变频器防尘控制柜的安装可以是在单独的密闭空调机房内,这样的安装方式更适合控制多设备,且建立机房的成本低于柜体单独密闭处理的场合。变频器控制柜的进风口应独立设置在柜体的底部,进风口与地沟相通,地沟的设计要求是独立、密闭,并在防尘柜进风口的位置安装防尘网。变频器控制柜所连接的地沟如果超过5米以上,则应考虑安装鼓风机以保持通风。变频器的控制柜内还可以放置干燥机或活性炭,以保证吸收湿气或其他有毒气体,避免变频器材料的锈蚀,干燥剂或活性炭需要及时更换。
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