变频器功率的选用
系统效率等于变频器效率与电动机效率的乘积,只有两者都处在较高的效率下工作时,则系统效率才较高。从效率角度出发,在选用变频器功率时,要注意以下几点: [9]
1)变频器功率值与电动机功率值相当时合适,以利变频器在高的效率值下运转。 [9]
2)在变频器的功率分级与电动机功率分级不相同时,则变频器的功率要尽可能接近电动机的功率,但应略大于电动机的功率。 [9]
3)当电动机属频繁起动、制动工作或处于重载起动且较频繁工作时,可选取大的变频器,以利用变频器长期、安全地运行。 [9]
4)经测试,电动机实际功率确实有富余,可以考虑选用功率小于电动机功率的变频器,但要注意瞬时峰值电流是否会造成过电流保护动作。 [9]
5)当变频器与电动机功率不相同时,则相应调整节能程序的设置,以利达到较高的节能效果 [9] 。
变频器箱体结构的选用
变频器的箱体结构要与环境条件相适应,即考虑温度、湿度、粉尘、酸碱度、腐蚀性气体等因素。常见有下列几种结构类型可供用户选用: [9]
1)敞开型IPOO型本身无机箱,适用装在电控箱内或电气室内的屏、盘、架上,尤其是多台变频器集中使用时,选用这种型式较好,但环境条件要求较高; [9]
2)封闭型IP20型适用一般用途,可有少量粉尘或少许温度、湿度的场合; [9]
3)密封型IP45型适用工业现场条件较差的环境; [9]
4)密闭型IP65型适用环境条件差,有水、尘及一定腐蚀性气体的场合
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