MVME143-2
MVME143-2 即变频器输出频率的上、下限幅值。 频率限制是为防止误操作或外接频率设定信号源出故障,而引起输出频率的过高或过低,以防损坏设备的一种保护功能。 在应用中按实际情况设定即可。 此功能还可作限速使用,如有的皮带输送机,由于输送物料不太多,为减少机械和皮带的磨损,可采用变频器驱动,并将变频器上限频率设定为某一频率值,这样就可使皮带输送机运行在一个固定、较低的工作速度上。
有的又叫偏差频率或频率偏差设定。 其用途是当频率由外部模拟信号(电压或电流)进行设定时,可用此功能调整频率设定信号低时输出频率的高低。 有的变频器当频率设定信号为0%时,偏差值可作用在0~fmax范围内,有的变频器(如明电舍、三垦)还可对偏置极性进行设定。 如在调试中当频率设定信号为0%时,变频器输出频率不为0Hz,而为xHz,则此时将偏置频率设定为负的xHz即可使变频器输出频率为0Hz。
MVME143-2
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