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为了减少4L—20/8型空气压缩机(以下简称为空压机)起动时电动机(JR127—8型,380~v,130~(kw))起动电流对电网的影响,空压机起动前必须关闭减荷阀,尤其是在风包内具有一定压力的情况下,更应空载起动,否则不仅将对电网造成较大的电流冲击,而且往往导致起动失败。 针对这一问题,我们在保留空压机减荷阀原有手动和气动两种控制方式的基础上,对减荷阀进行了一点改进,并通过电气接线,使之在起动阶段以电磁动作方式,自动卸荷,从而保证了空压机能空载起动。 改装后的减荷阀如图(1)所示。电磁铁的电气接线如图(2)所示。起动时,在主接触器C给电动机送电的同时,其辅助触
In order to reduce the influence of the motor (JR127-8 type, 380 ~ v, 130 ~ (kw)) starting current on the grid when starting the 4L-20/8 air compressor (hereinafter referred to as air compressor) Shutoff valve must be closed, especially in the case of a certain pressure in the wind package should be more no-load start, otherwise it will not only cause a large current impact on the power grid, and often lead to failure to start. In response to this problem, we retain the air compressor relief valve original manual and pneumatic two kinds of control based on the relief valve to a little improvement, and through the electrical wiring, so that the starting phase of the electromagnetic action , Automatic unloading, thus ensuring the air compressor can start without load. The modified relief valve is shown in Figure (1). Electromagnetic wiring as shown in figure (2). At start-up, it assists the touch while main contactor C feeds the motor