A06B-6079-H206

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A06B-6079-H206

由于不正确的起动和过大的负载转矩以及频繁的反接制动，都会引起过电流。为了限制电动机的起动或制动电流过大，常常在直流电动机的电枢回路中或交流绕线转子电动机的转子回路中串入附加的电阻。若在起动或制动时，此附加电阻已被短接，就会造成很大的起动或制动电流。另外，电动机的负载剧烈增加，也要引起电动机过大的电流，过电流的危害与短路电流的危害一样，只是程度上的不同，过电流保护常用断路器或电磁式过电流继电器。将过电流继电器串联在被保护的电路中，当发生过电流时，过电流继电器KA线圈中的电流达到其动作值，于是吸动衔铁，打开其常闭触点，使接触器KM释放，从而切断电源。这里过电流继电器只是一个检测电流大小的元件，切断过电流还是靠接触器。如果用断路器实现过电流保护．则检测电流大小的元件就是断路器的电流检波线圈，而断路器的主触点用以切断过电流。

热保护又称长期过载保护。所谓过载是指电动机的电流大于其额定电流。造成过载的原因很多，如负载过大、三相电动机单相运行、欠电压运行等。当长期过载时，电动机发热，使温度超过允许值，电动机的绝缘材料就要变脆，寿命降低、严重时使电动机损坏，因此必须予以保护。常用的过载保护元件是热继电器。热继电器可以满足这样的要求：当电动机为额定电流时，电动机为额定温升，热继电器不动作；在过载电流较小时，热继电器要经过较长时间才动作；过载电流较大时，热继电器则经过较短时间就会动作。
    由于热惯性的原因，热继电器不会因电动机短时过载冲击电流或短路电流而立即动作。所以在使用热继电器作过载保护的同时，还必须设有短路保护，并且选作短路保护的熔断器熔体的额定电流不应超过4倍热继电器发热元件的额定电流。当电动机正在运行时，如果电源电压因某种原因消失，为了防止电源恢复时电动机自行起动的保护称为零电压保护，零电压保护常选用零压保护继电器KHV。当电动机正常运行时，电源电压过分地降低将引起一些电器释放，造成控制线路不正常工作，可能产生事故。因此，需要在电源电压降到一定允许值以下时，将电源切断，这就是欠电压保护。欠电压保护常用电磁式欠电压继电器K当电动机正常运行时，电源电压过分地降低将引起一些电器释放，造成控制线路不正常工作，可能产生事故。因此，需要在电源电压降到一定允许值以下时，将电源切断，这就是欠电压保护。欠电压保护常用电磁式欠电压继电器KV来实现。欠电压继电器的线圈跨接在电源两相之间，电动机正常运行时，当线路中出现欠电压故障或零压时，欠电压继电器的线圈KV得电，其常闭触点打开，接触器KM释放，电动机被切断电源。对于按钮起动并具有自锁环节的电路，本身已具有零电压保护功能，不必再考虑零电压保护。

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先介绍几点经验。
1、先通读一遍“系统手册”（不管能不能看懂，先了解个大概，以便学习编程时查找）；
2、由位控逻辑入手，逐渐增加定时、计数等条件，把或、与、非关系理顺；
3、进而练习整数运算、实数运算、类型转换；
4、量程转换、PID调节回路的建立及P、I、D参数的理解（最好是有个物理回路验证，比如变频器+电机+测速传感器）；
5、循环、顺序、跳转等程序控制（尽量避免跳转，非跳不可时也是跳的越近越好）；
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列，GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌，由于PLC的基本框架大同小异，学会一种至于其它的学习起来也就简单了。

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