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故障现象：接通电源闸刀，按下控制台上电源通开关ＡＮ１后控制台得电工作，但松开ＡＮ１后控制台立即掉电。分析检修：从现象看故障多为电源接触器不能自锁所致，由电源电路图可看出，电源接触器Ｄ工作状态为：当按下ＡＮ１（或ＡＮ３）后，Ｌ１→００２→ＲＤ１→００４→Ｄ
Symptom: After turning on the power switch, press the power switch AN1 on the console and the console gets power, but after the AN1 is released, the console immediately loses power. Analysis and maintenance: from the phenomenon of failure to see the power contactor can not be caused by the self-locking, from the power supply circuit diagram can be seen, the power contactor D working state: When pressed AN1 (or AN3), L1 → 002 → RD1 → 004 →D