6ES7412-2XJ05-0AB0 亿佳购
失速防止功能是什么意思?
如果给定的加速时间过短,变频器的输出频率变化远远超过转速(电角频率)的变化,变频器将因流过过电流而跳闸,运转停止,这就叫作失速。为了防止失速使电机继续运转,就要检出电流的大小进行频率控制。当加速电流过大时适当放慢加速速率。减速时也是如此。两者结合起来就是失速功能。
15、有加速时间与减速时间可以分别给定的机种,和加减速时间共同给定的机种,这有什么意义?
加减速可以分别给定的机种,对于短时间加速、缓慢减速场合,或者对于小型机床需要严格给定生产节拍时间的场合是适宜的,但对于风机传动等场合,加减速时间都较长,加速时间和减速时间可以共同给定。
16、什么是再生制动?
电动机在运转中如果降低指令频率,则电动机变为异步发电机状态运行,作为制动器而工作,这就叫作再生(电气)制动。
17、是否能得到更大的制动力?
从电机再生出来的能量贮积在变频器的滤波电容器中,由于电容器的容量和耐压的关系,通用变频器的再生制动力约为额定转矩的10%~20%。如采用选用件制动单元,可以达到50%~。
18、请说明变频器的保护功能?
保护功能可分为以下两类:
(1) 检知异常状态后自动地进行修正动作,如过电流失速防止,再生过电压失速防止。
(2) 检知异常后封锁电力半导体器件PWM控制信号,使电机自动停车。如过电流切断、再生过电压切断、半导体冷却风扇过热和瞬时停电保护等。
19、为什么用离合器连续负载时,变频器的保护功能就动作?
用离合器连接负载时,在连接的瞬间,电机从空载状态向转差率大的区域急剧变化,流过的大电流导致变频器过电流跳闸,不能运转。
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