MPM-B2154B-SJ72AA

MPM-B2154B-SJ72AA

MPM-B2154B-SJ72AA

MPM-B2154B-SJ72AA

 strb软启动器的主控制板上有14个外部端子，可以实现外部信号控制、远程控制及系统控制提供方便。结合现场实际情况，未用到的端子未画出。本系统端子包括起动、停机、故障输出(作报警用)，外配旁路接触器控制接口等。

            6 strb软启动器的控制模式

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            strb系列软启动的起动方式有限流起动和电压斜坡起动，同时还具有点动运行功能(本系统没有采用点动)，可根据实际情况进行选择。
            6.1 限流软起动控制模式
            在限流起动模式下，当电机起动时，其输出电压值迅速增加，直到输出电流达到设定的电流限幅值im，如图5所示。并保持输出电流不大于该值，电压逐渐升高，使电动机逐渐加速，当电动机接进额定转速时，输出电流迅速下降至额定电流ie，完成起动过程。

            图5 限流软起动
            电流限幅值可根据实际负载的情况进行设定，设定范围为电机额定电流ie的0.4～0.8倍。
            6.2 电压斜坡软起动控制模式
            图6给出了电压斜坡起动的电压变化波形图。其中u1为起动时软起动器的初始电压值。当电机起动时，软起动器的输出电压迅速上升到u1，然后按所规定的时间t迅速上升，电机随着电压的上升不断加速，当电机达到额定电压ue时，电机达到额定转速，起动完成。初始电压u1和起动时间t均可根据负载情况进行设定，u1的设定范围为0~380v，t的设定范围为0~600s。

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