6ES7323-1BL00-9AM0 增强型
变频器能用来驱动单相电机吗?可以使用单相电源吗?
基本上不能用。对于调速器开关起动式的单相电机,在工作点以下的调速范围时将烧毁
辅助绕组;对于电容起动或电容运转方式的,将诱发电容器爆炸。变频器的电源通常为3相,但对于小容量的,也有用单相电源运转的机种。
27、变频器本身消耗的功率有多少?
它与变频器的机种、运行状态、使用频率等有关,但要回答很困难。不过在60Hz以下的变频器效率大约为94%~96%,据此可推算损耗,但内藏再生制动式(FR-K)变频器,如果把制动时的损耗也考虑进去,功率消耗将变大,对于操作盘设计等必须注意。
28、为什么不能在6~60Hz全区域连续运转使用?
一般电机利用装在轴上的外扇或转子端环上的叶片进行冷却,若速度降低则冷却效果下降,因而不能承受与高速运转相同的发热,必须降低在低速下的负载转矩,或采用容量大的变频器与电机组合,或采用专用电机。
29、使用带制动器的电机时应注意什么?
制动器励磁回路电源应取自变频器的输入侧。如果变频器正在输出功率时制动器动作,将造成过电流切断。所以要在变频器停止输出后再使制动器动作。
30、想用变频器传动带有改善功率因数用电容器的电机,电机却不动,清说明原因
变频器的电流流入改善功率因数用的电容器,由于其充电电流造成变频器过电流(OCT),所以不能起动,作为对策,请将电容器拆除后运转,甚至改善功率因数,在变频器的输入侧接入AC电抗器是有效的。
31、变频器的寿命有多久?
变频器虽为静止装置,但也有像滤波电容器、冷却风扇那样的消耗器件,如果对它们进行定期的维护,可望有10年以上的寿命。
32、变频器内藏有冷却风扇,风的方向如何?风扇若是坏了会怎样?
对于小容量也有无冷却风扇的机种。有风扇的机种,风的方向是从下向上,所以装设变频器的地方,上、下部不要放置妨碍吸、排气的机械器材。还有,变频器上方不要放置怕热的零件等。风扇发生故障时,由电扇停止检测或冷却风扇上的过热检测进行保护 33、滤波电容器为消耗品,那么怎样判断它的寿命?
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