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时间继电器自动控制 Y-△ 降压启动线路故障检修

课题：. 时间继电器自动控制 Y-△ 降压启动线路故障检修. QS. FU 2. L 1. 1. L 2. L 3. 0. FR. 2. FU 1. SB 2. KM. 3. SB 1. FR. KM. 4. KM Y. KM △. U 1. V 1. W 1. 5. 7. KT. KM Y. 6. 8. M. KM △. KM Y. KT. KM. KM △. 3 ～. PE. W 2. V 2. U 2. KM Y. 复习： 时间继电器自动控制 Y -△ 降压启动线路的工作原理：. 开始计时.

michiko-hanabishi
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时间继电器自动控制 Y-△ 降压启动线路故障检修

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  1. 课题： 时间继电器自动控制Y-△降压启动线路故障检修

  2. QS FU2 L1 1 L2 L3 0 FR 2 FU1 SB2 KM 3 SB1 FR KM 4 KMY KM△ U1 V1 W1 5 7 KT KMY 6 8 M KM△ KMY KT KM KM△ 3～ PE W2 V2 U2 KMY 复习：时间继电器自动控制Y-△降压启动线路的工作原理： 开始计时 延时断开 “Y”接法降压启动 “△”接法全压运行

  3. QS FU2 L1 1 L2 L3 0 FR 2 FU1 SB2 KM 3 SB1 FR KM 4 KMY KM△ U1 V1 W1 5 7 KT KMY 6 8 M KM△ KMY KT KM KM△ 3～ PE W2 V2 U2 KMY 复习：时间继电器自动控制Y-△降压启动线路的工作原理： “Y”接法降压启动 “△”接法全压运行 4 1 5 3 2 0

  4. FU L1 L2 1 Ω FR 0 2 Ω SB2 3 Ω KM SB1 4 Ω KM 电阻分段测量法(a) (a)

  5. FU ① ② ③ ④ L1 L2 1 Ω FR 0 2 Ω SB2 3 Ω KM SB1 4 Ω KM 电阻分段测量法(b)

  6. FU2 L1 1 L2 0 FR 2 3 SB2 SB1 KM 4 KMY KM△ 5 7 KT KMY 6 8 KMY KT KM KM△ 一、故障检修步骤： 1、用通电试验法观察故障现象； 2、断电后用逻辑分析法确定故障范围； 3、用电阻测量法正确找出故障点； 4、排故后通电试车。 二、通电检修注意事项： 1、通电前检查电路是否存在安全隐患； 2、规范操作：严格按照通、断电次序操作； 3、通电检查时，发现不正常情况应立即停车检查； 4、不要随意触动带电电器； 5、养成单手操作的习惯。

  7. 课后思考： 一旦主电路出现故障（开路或短路）对整个电路的运行和电机有什么影响，会出现什么后果？

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