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在多粉尘场所，特别是多金属粉尘、絮状物的场所使用变频器时，采取正确、合理的防护措施是十分必要的，防尘措施得当对保证变频器正常工作非常重要。总体要求控制柜整体应该密封，应该通过专门设计的进风口、出风口进行通风;控制柜顶部应该有防护网和防护顶盖出风口;控制柜底部应该有底板和进风口、进线孔，并且安装防尘网。
(1)控制柜的风道要设计合理，排风通畅，避免在柜内形成涡流，在固定的位置形成灰尘堆积。
(2)控制柜顶部出风口上面要安装防护顶盖，防止杂物直接落入;防护顶盖高度要合理，不影响排风。防护顶盖的侧面出风口要安装防护网，防止絮状杂物直接落入。
(3)如果采用控制柜顶部侧面排风方式，出风口必须安装防护网。
(4)一定要确保控制柜顶部的轴流风机旋转方向正确，向外抽风。如果风机安装在控制柜顶部的外部，必须确保防护顶盖与风机之间有足够的高度;如果风机安装在控制柜顶部的内部，安装所需螺钉必须采用止逆弹件，防止风机脱落造成柜内元件和设备的损坏。建议在风机和柜体之间加装塑料或者橡胶减振垫圈，可以大大减小风机震动造成的噪音。
(5)控制柜的前、后门和其他接缝处，要采用密封垫片或者密封胶进行一定的密封处理，防止粉尘进入。
(6)控制柜底部、侧板的所有进风口、进线孔，一定要安装防尘网。阻隔絮状杂物进入。防尘网应该设计为可拆卸式，以方便清理、维护。防尘网的网格要小，能够有效阻挡细小絮状物(与一般家用防蚊蝇纱窗的网格相仿);或者根据具体情况确定合适的网格尺寸。防尘网四周与控制柜的结合处要处理严密。
(7)对控制柜一定要进行定期维护，及时清理内部、外部的粉尘、絮毛等杂物。维护周期可根据具体情况而定，但应该小于2～3个月;对于粉尘严重的场所，建议维护周期在1个月左右。
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