电气原理图主要分主电路和控制电路两部分。电动机的通路为主电路,接触器吸引线圈的通路为控制电路。此外还有信号电路、 照明电路等。原理图中,各电器元件不画实际的外形图,而采用规定的统一,文字符号也要符合规定。在电气原理图中,同一电器的不同部件常常不画在一起,而是画在电路的不同地方,同一电器的不同部件都用相同的文字符号标明,例如接触器的主触头通常画在主电路中,而吸引线圈和辅助触头则画在控制电路中,但它们都用KM表示。同一种电器一般用相同的字母表示,但在字母的后边加上数码或其他字母下标以示区别,例如两个接触器分别用KM1、KM2表示,或用KMF、KMR表示。全部触头都按常态给出。对接触器和各种继电器,常态是指未通电时的状态; 对按钮、 行程开关等,则是指未受外力作用时的状态。原理图中,无论是主电路还是辅助电路,各电气元件一般按动作顺序从上到下,从左到右依次排列,可水平布置或者垂直布置。原理图中,有直接电联系的交叉导线连接点,要用黑圆点表示。无直接联系的交叉导线连接点不画黑圆点。 电气控制系统是由许多电气元件按照一定要求联接而成的。为了表达生产机械电气控制系统的结构、原理等设计意图,同时也为了便于电气系统的安装、调整、使用和维修,需要将电气控制系统中各电气元件及其联接用一定图形表达出来,这种图就是电气控制系统图。 为了提高电气系统图的通用性,局参照电工**(IEC)颁布的有关文件,制定了我国电气设备的有关。电气图形符号通常用于电气系统图,用以表示一个设备或器件的图形,文字符号适用于电气技术文件(包括电气系统图)用以标明电气设备、器件的名称、功能、状态及特征。 人生的旅途并非花团锦簇,坎坷磨难常常使你以伤痕累累来诠释,而生活的热情不能就此冷却,路,还得走下去。 从善如登,从恶如崩。 我们的生命不应该成为我们人生道路上的一个沉重包袱,我们的人生道路也不该成为一个漫长曲折、充满荆棘的艰难旅程。即使是一位孤独的诗人,也不必老是反复吟唱那首过时的歌谣。 如果哪一天你在网上找到我们,请拿起电话拨通我们的号码 哪怕您再忙再没空,只要您一声“我要询价”,我们都会把价格摆在您的面前的. 这是我们对客户较真挚的承诺!!! 您询,或者不询,价格就在这里,不增不减! 您打,或者不打,电话就在这里,不来不去! 您下,或者不下,订单就在这里,不舍不弃! 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Learn more - eBay Money Back Guarantee - opens in new window or tab Seller information swvasurplus (4966 ) 99.8% Positive feedback Save this Seller Contact seller Visit store See other items GE CR121E-N02HA42 7 Day Time Switch, 3 Pole, Single Throw, 40A, 240V Control GE Security GE-ZB266DW 2.6" Wireless Dual Face Digital Clock With Date GE 15 VDC Dual Power Supply, 195B9815AAG002 Westinghouse 180C180G06 DPCK Contact Kit, 3-Pole, 100A, Partial Kit Square D 9001K35H2 Joystick Operator,