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防爆变频柜调速的正确设定
点击次数:60 发布时间:2019-11-26

防爆变频柜调速的正确设定
一、随着变频调速技术的发展,变频器调速已成为交流调速的主流,在化纤、纺织、钢铁、机械、造纸等行业得到广泛的应用。由于通用变频器一般采用V/f控制,即变压变频(VVVF)方式调速,因此,变频器在使用前正确地设定其压频比,对保证变频器的正常工作至关重要。变频器的压频比由变频器的基准电压与基准频率两项功能参数的比值决定,即基准电压/基准频率=压频比。 基准电压与基准频率参数的设定,不仅与电动机的额定电压与额定频率有关(电机的压频比为电机的额定电压与额定频率之比),而且还必须考虑负载的机械特性。对于普通异步电机在一般调速应用时,其基准电压与基准频率按出厂值设定(基准电压380V,基准频率50Hz),即满足使用要求。但对于某些行业使用的较特殊的电机,就必须根据实际情况重新设定基准电压与基准频率的参数。由于变频器使用说明书以及有关书籍中没有对这两个参数作详细介绍,因此正确的设定该参数对于不少使用者来说,并非很容易的事。为此,本文结合变频调速的基本控制方式及负载的机械特性与基准电压、基准频率参数的关系,列举实例,详细说明基准电压与基准频率参数的设定方法。 

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防爆变频柜调速的正确设定

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四、设定实例 
例一 :一台化纤纺丝计量泵电机型号为FTY-550-6,既550W 6极三相永磁同步电动机。铭牌参数如下:工作电压:62.5 - 125 - 475V。工作频率:25 - 50 - 190HZ,电机功率:275 - 550 - 2090W,转速:500 - 1000 - 3800R/min,电流:4A。其工作范围较宽,铭牌参数与一般异步电动机不同,左边的数值为电机正常工作时(不失步)的下限,右边数值为电机正常工作时的大值,中间值为额定值(50HZ)。该电机压频比为125V/50HZ=2.5,使用三 垦SAMCO-I 1HF1.5K变频器。若只按电机参数设定,电机的额定电压与额定频率值既为变频器的基准电压与基准频率值,基准电压(代码为CD005)设为125V,基准频率(CD006)为50HZ(出厂值)不变,这样设定,电机工作在基频以下时,电机驱动计量泵毫无问题,但计量泵属于恒转矩负载,若在计量泵要求 较高转速(如90HZ)时,那么频率虽然可调至90HZ,但此时电机工作电压仍为125V,实际压额比为125/90HZ=1.39,电磁转矩变小,无法提供负载所需转矩,使计量泵不能正常工作。正确的设定应为:CD005=475V,CD006=190HZ,在这里基准电压虽设为475V,但由于变频器不具有升压功能,其实际输出电压由输入电压的大值决定,所以这样设定只对增大V/F图形的斜率有效,并不真能达到475V。因此也可以这样设定:CD005=380V,CD006=152HZ,变频器的压频比仍为380V/152HZ=2.5不变,,电机整个工作段都处于恒转矩调速范围,满足了负载特性的要求。 例2:一台纺织用三相异步调速电动机,额定功率60W,额定电压110V,额定频率50HZ,调速范围40-110HZ,额定电流0。34A,4极,因此该电机的压频比为110V/50HZ=2。

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天天斗地主阐述了根据负载的机械特性和电机参数设定变频器的基准电压和基准频率的方法,可以看出,正确的设定好变频器的基准电压,基准频率,既能充分利用变频器的性能,又能满足负载对变频器的要求。如果设定不当,变频器与电机甚至不能工作。因此,正确的设定变频器的压频比是使用好变频器的关键。


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