TWIFLEX 制动器 EAPARTNO7701211

TWIFLEX 制动器 EAPARTNO7701211

TWIFLEX 制动器 EAPARTNO7701211

本公司中海德（福建）工业设备有限公司专业销售大型进口各种品牌DCS系统模块备件：主营产品：DCS集散式控制系统、PLC可编程控制。

主要业务: ABB DCS卡件Ovation系统模块Foxboro系统卡件Triconex系统模块

Rexroth力士乐全系列产品Modicon停产模块 等各类工控产品施耐德140系列CPU,PLC

西门子6DD，6FX，6SC，6FC，6S5系列AB1746，1756，1747，1785系列PLC 

GE 通用电气 发那科

订购专员：陈小真

订购热线：18005006971/  0591- 83566917

在线咨询qq：2851617312

传真：0591-83489960

地址：福建省福州市高新区乌龙江大道正荣财富中心B座八层

如何正确选择西门子电机用变频器？

西门子变频器的常用种类有以下：6SE6440、430、420 三种。通常，在这三者之间的选择也是有讲究的。以下，西贝尔给大家列出几点：

1、380-480VAC供电、且不含滤波器的产品，属于西门子440系列变频器常用品。只要针对440系列找到对应的型号就好了。

2、部分功率对用的产品油原装进口和国内生产两种，国内生产的价格相对于纯进口的产品要便宜。

3、变频器型号对应的功率，指是的是很转矩输出功率。

4、一般选购标配的西门子变频器，是不含控制面板的。控制面板需要单独订购。控制面板包括中文的和英文的。英文控制面板比中文的要便宜一点。

上面我们提到，国内标准电机380V电压常用的440系列西门子变频器。那么，具体如何选择适合的440系列变频器呢？440功率范围：0.37-255kW。其中，0.12kW-200kW（CT恒转矩）；0.12kW-250kW（VT变转矩）。一般来说：电机功率多少，变频器就配多少，按1：1原装来配。如果是重负载与变频器的距离比较远，变频器的功率要比电机的功率大一到两个等级。如果一台变频器带多台电机，变频器选择比电机功率大一级的即可，并不是所带电机功率的总和哦。

选购变频器一般要考虑以下参数：

1、功率

多大功率电机就选多大功率的变频器。但对于特殊场合，如高温、高海拔，此时会引起变频器的降容，变频器容易要放大一档。

2、电流

变频器的额定电流比电机运营的最大电流大即可，一般铭牌上都有标识。

3、供电电压

一般低压变频器有单相220-240V、三相380-480V供电等，具体选型，根据实际需求额定。

4、负载惯性

有些场合例如大部分通风管道，对电机及时停下并无要求，有的传输带则要求及时停下来，因此也可以作为选购变频器的参考条件。

一台西门子变频器，是可以控制多台电机的。这种应用情况，我们通常称为“一拖多”。运行多年也很少出故障。不过变频器一拖多要注意以下几点：

1、控制方式一定要用线性的V/F控制

2、一拖多仅运用于对电机转速调节无严格要求的场合；

3、各个电机额定电流的总和要小于变频的额定电流；

4、各个电机上要加装独立的热继电器。

5、各电机功率尽量一致

6、各输出回路物理特性差异尽量小，包括：

A、电机特性，如转速；

B、电缆特性，如截面积，长度，材料。

7、如果电机特性基本一致，电缆长度接近变频器允许的极限长度时可采取增加出线电抗器、降低开关频率、适当加大变频器等方法。

对于中端应用，客户在选择变频器时，通常都会考虑西门子或者ABB。的确，在高端的某些特殊行业，比如起重、轧钢等，个人觉得使用西门子等国外品牌的变频器，也会多一点保障，少出一点故障的。后期使用上还是省心不少的哦。

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