电路一般可分为单线制和双线制,工程机械多采用单线制,本文仅讲述单线制电路常见故障的检查方法。1.断路断路故障表现为在保险丝或者自动保护开关完好的情况下,接通电路开关,用电设备不工作。该种故障原因有三:一是电路中插头松动、脱落或有油污,二是开关触点氧化或失效,三是导线折断或搭铁线搭铁不实。该故障通常采用试灯逐点检查。为了便于记忆,检查方法归纳为:查断路,灯并联;一端接车体,一端连测点;接通总开关,逐点来查线;灯亮电路通,不亮电路断:灯亮向后找,不亮向前查:亮与不亮间,即为断路点。 Circuit generally can be divided into single-and double-wire system, construction machinery and more use of single-wire system, this article only describes the single-wire circuit common fault check. 1. Open circuit fault failure performance in the fuse or automatic protection switch intact circumstances, connected to the circuit switch, power equipment does not work. There are three reasons for this failure: First, loose plug circuit, off or oil, the second switch contact oxidation or failure, the third is the wire break or take the ground wire is not real. The fault is usually detected by the test light point by point. In order to facilitate the memory, the inspection methods are summarized as follows: check the road, lights in parallel; one end of the car body, one end with the measuring point; connected to the main switch, point by point to check the line; light circuit through, off the circuit off: Not bright forward check: bright and not bright, that is, the circuit breaker.