西门子6DD1682-0AJ1 集成电路
原理
HPMV的控制核心是微处理器CPU。这个微处理控制系统可以对电机进行起动和保护。CPU对SCR进行相角触发控制以降低加在电机上的电压,然后通过慢慢的控制加在电机上的电压和电流平滑的增加电机转矩,直到电机加速到全速运行。这种起动方式可以降低电机的起动冲击电流,减少对电网和电机自身的冲击。同时也减少了对联在电机上机械负载装置的机械冲击,以延长设备的使用寿命,减少故障和停机检修时间。
A、加速模式:HPMV提供了几种加速模式,你可以根据感应电机的负载情况选择合适的起动曲线。
出厂设置为具有限流功能的电压斜坡,也是可靠的起动模式,可以满足大多数应用场合。初始转矩设定为电机刚好能带动负载转动时的值,然后电压逐渐的平滑上升,在限定的斜坡时间和电机起动电流范围内,使电机平滑到全速运转。下面三种起动状态的分析:
a、 如果电机在软起斜坡结束前达到全速运行,自动反震荡电路将会自动的把全压加到电机上而使斜坡时间不再起作用。可以防止任何的浪涌电流或电机转矩的脉动。这种情况通常可能会发生在负载没有加在电机上而电机工作在减压和低转矩的电机起动过程中。
b、 如果电机在斜坡时间结束前,没有达到全速运行,电流限流设定将会按比率的控制大输出转矩,
HPMV的反馈传感器会自动的防止电机过载失速或超过加速设定时间的故障发生。
c、 限流功能对于电机从电网或发电机中吸取数量的电流提供了有效的手段和控制方式,当电机起动转矩达到限定的起动电流值所对应的转矩后,就会自动的保持这个转矩和电流运行,电流限流值不受设定斜坡时间的影响,直到电机达到全速运行为止。当电机达到全速运行后,电机电流降到正常全速运行的电流值,HPMVK中、高压软起动器有一个全速运行状态输出继电器,从而使旁路高压真空接触器闭合,使电机电流经旁路接触器,从而防止SCR导通所产生的压降引起的热损耗,了工作效率及可靠性。MPMV是工作在全压状态下,正如其它起动器一样,在电机软起动后,电网电压直接加到电机上,但是优于其它起动方式之处在于HPMV具有全电子保护功能,它的灵敏度和对故障保护反映速度是用毫秒来计算,这是常规的电机起动和保护器无法比拟的。
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