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一台湖北罗田精峰试验设备厂产的12PSD75型喷油泵试验台,在调试喷油泵时,突然转速自选迅速升高,无法控制,就象柴油机“飞车”相似。切断电源检查,发现可控硅失效,测量可控硅两极,正反向电阻几乎为0,说明击穿。正常情况应是正向电阻在10k
A 12PSD75 fuel injection pump test bed produced by Hubei Luotian Jingfeng Test Equipment Factory suddenly rises in speed and can not be controlled when debugging the fuel injection pump. It is similar to a diesel “speeding car”. Cut off the power supply and found that the SCR failure, measurement of silicon bipolar, positive and negative resistance is almost 0, indicating breakdown. Normal situation should be positive resistance in 10k