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改线目的改线前,当施行电阻制动时,若司机误将冷却风扇按钮4AN闭合,则造成“机控”电路由导线969双重供电。这样,当由电阻制动工况转换到牵引工况时,励磁接触器LC,励磁机励磁接触器LLC和主接触器1C～3C均不会释放。制动转换器HK由制动位转入牵引位,即带电切换主电路,致使该转换器严重烧损。我段机车为防止制动转换器带电转换进行了改线(见本刊77№2)。改线后遇到这种
Retrofitting purposes Before rerouting, when a resistance brake is applied, if the driver mistakenly closes the cooling fan button 4AN, the “machine control” circuit is powered by the double wire 969. In this way, the exciter contactor LC, exciter field contactor LLC and main contactor 1C ~ 3C will not be released when switching from the resistance braking mode to the traction mode. Brake converter HK brake position into the traction bit, that is, switching the main circuit live, causing the converter serious burn. I paragraph locomotive to prevent the brake converter live conversion conversion (see article 77 № 2). After changing the line encountered this