Common troubleshooting of submersible sewage pump
是日常维修保养工作中经常遇到的一种泵，常常用于市政污水，雨水，排涝，出现问题的概率相当高，出现这些问题的原因多种多样，可以从三方面着手来分析解决问题，分别是：电气原因，机械原因，与控制原因。
Sewage pump is a kind of pump often encountered in daily maintenance work, often used for municipal sewage, rain water, drainage, the probability of problems is quite high, the reasons for these problems are diverse, can start from three aspects to analyze and solve the problem, respectively: electrical reasons, mechanical reasons, and control reasons.
常见的湿式安装
1，电机通电后，泵出口不出水，常见原因如下：
1.1 电气方面原因：
Common submersible pump wet installation
1. After the motor is powered on, there is no water at the pump outlet. The common reasons are as follows:
1.1 Electrical reasons:
1.1.1 接线是否正确，接线错误，电机可能存在反转，需要调换任两根主线，改变泵转向。
1.1.2 电机是否故障：通过万用表，测量电机三相阻值是否正常，三相电阻是否平衡，线圈对地绝缘值是否达到标准。
1.1.1 If wiring is correct or wrong, the motor may be reversed, so it is necessary to replace the two main lines and change the pump steering.
1.1.2 Whether the motor is faulty: Use a multimeter to measure whether the three-phase resistance value of the motor is normal, whether the three-phase resistance is balanced, and whether the insulation value of the coil to the ground reaches the standard.
1.1.3 还需要检查电机温度电阻阻值是否正常，某些品牌泵在电机腔还装有泄露传感器，需要检查阻值来判断机封是否损坏，输送介质是否进到电机触发报警。
1.1.4 通过测量泵上电压是否存在缺相或者低电压情况。
1.2 机械方面原因：
1.2.1 需要检查出口阀门是否打开，阀门是否有故障。
1.2.2 泵是否正确安装到耦合上，存不存在虚接的可能（最好是在水位低的情况下安装泵，可以看到泵与耦合实际配合情况），管路水下部分是否有破损。
1.2.3 泵入口是否存在污泥堆积情况，出现污水入水不畅可能。
1.2.4 叶轮是否已经磨损，泵壳的耐磨环是否磨损，泵轴是否断裂。
1.2.5 电机轴承是否存在损坏，可以通过电机电流来测量判断。
1.1.3 Also need to check whether the temperature resistance resistance value of the motor is normal, some brands of pump in the motor cavity is also equipped with a leakage sensor, need to check the resistance value to determine whether the machine seal is damaged, whether the transmission medium into the motor trigger alarm.
1.1.4 By measuring the voltage on the pump whether there is phase deficiency or low voltage.
1.2 Mechanical reasons:
1.2.1 It is necessary to check whether the outlet valve is open and whether the valve is faulty.
1.2.2 Whether the pump is correctly installed on the coupling, whether there is the possibility of virtual connection (it is better to install the pump under the condition of low water level, so that the actual cooperation between the pump and the coupling can be seen), and whether the underwater part of the pipeline is damaged.
1.2.3 Whether there is sludge accumulation at the pump entrance and the possibility of poor sewage entering the water.
1.2.4 Whether the impeller is worn, whether the wear ring of the pump shell is worn, and whether the pump shaft is broken.
1.2.5 Whether the motor bearing is damaged can be measured and judged by the motor current.
1.3 Control Unit Fault:
1.3.1 控制柜是否有电气元件故障，虚接，老化情况
1.3.2 液位浮球是否正常工作
2，电机通电后，泵出口流量压力达不到要求，常见原因如下：
2.1 机械方面原因
1.3.1 Control cabinet whether there are electrical components fault, false connection, aging
1.3.2 Whether the liquid level floating ball works normally
2. After the motor is energized, the pump outlet flow pressure fails to meet the requirements. The common reasons are as follows:
2.1 Mechanical reasons
2.1.1 过流部件是否磨损，叶轮，口环间隙是否超标。
2.1.2 是否有杂物堵住叶轮流道。入口是否有污泥堆积。
2.1.3 管路是否有破损，尤其是水下部分，可视性差。
2.2 电气方面原因
2.1.1 Whether the flow parts are worn, whether the clearance of impeller and mouth ring exceeds the standard.
2.1.2 Whether there are sundries blocking the impeller runner. Whether there is sludge accumulation at inlet.
2.1.3 Whether the pipeline is damaged, especially the underwater part, with poor visibility.
2.2 Electrical reasons
2.2.1 电压是否正常，星三角接法需要搞清楚。
2.2.2 是否存在缺相的情况。
2.2.1 Whether the voltage is normal or not, the star triangle connection method needs to be made clear.
2.2.2 Whether there is phase deficiency.