2016/3/25 9:48:38 来源: 厦门泰尼电气有限公司
1746-IV32
1746-IV32
1746-IV32
曾给一冶金行业做除尘控制系统,该除尘风机是由10KV额定电压的电机经液力耦合器带动的,该电机的保护自然不少:震动、前后轴承温度、定子温度、冷却水温度......我们控制系统就是将这些信号采集,与其设定报警值比较,如果达不到要求,就不给电机发送“允许运行”的信号,达到了就发去信号。实际就是PLC输出控制一中继,中继的触点串在电机的控制回路中。当时为调试方便,就将该信号采用了中继的常闭触点,以为即使PLC不工作,也不影响电机的启动(因为当时PLC编程尚未完成,而业主已经将电机厂家叫到现场要求试电机)。结果被电机厂家(这是大连的一家电机厂)的技术人员发现了,他给我们讲了一件他刚刚碰到的事。他到另外一厂去调试,他们在现场仪表上看到轴瓦明明已经超温了,可电机依然在运转,导致价值几十万的轴瓦全烧坏。后来经检查,就是触点选择了常闭的,而PLC根本就没有投入运行。所以业主和该技术员要求我们必须采用常开触点!
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