品牌:施耐德 | 产地:法国 |
140CPS42400 施耐德PLC
140CPS42400 施耐德PLC
福建石屹科技有限公司 李工180- 6095- 8542
电机的数。一般电机数以不多于(为宜,否则变频器容量就要适当加大。
2)转矩、临界转矩、加速转矩。在同等电机功率情况下,相对于高过载转矩模式,变频器规格可以降额选取。3)电磁兼容性。为减少主电源干扰,使用时可在中间电路或变频器输入电路中增加电抗器,或安装前置隔离变压器。一般当电机与变频器距离超过50m时,应在它们中间串入电抗器、滤波器或采用屏蔽防护电缆 [9] 。
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、 地运行。 [9]
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