How to use digital multimeter to measure the quality of 220 Submersible pump
1. Check for leakage
The water pump has leakage and cannot be used at all. Even if it can be barely used, there are still too many safety hazards. Set the digital meter to the maximum resistance position, measure the power plug to the water pump casing, and check if there is at least 0.5 megohm of insulation resistance. The higher the resistance value, the better. If the resistance value is greater than or equal to 0.5 megohm, there is basically no leakage. If the number shows zero, it indicates serious leakage and there is a grounding fault.
Open the cover and check if there is any damage or collision with the casing on the incoming wire. If there is no damage, please contact the motor maintenance technician to resolve the problem.
2. Check the coil
If there is no leakage, start this step and measure whether the power plug is connected on the 2k gear of the digital meter. If it is not connected, confirm that the coil is burnt out or disconnected for some reason, and ask the maintenance technician to handle it.
If the live wire of the plug is measured and the zero wire is connected, then there is no problem. If it's too troublesome, you can plug in and test the machine. If it still doesn't work, remove the water pump cover and measure whether the three wires meet the resistance relationship of rCR+rCS=rRS. That is, the resistance relationship between the public end, startup end, and running end.
As long as the resistance relationship is met and there is no leakage, the water pump is basically good. If the next test drive still does not start, then it is necessary to check if it is stuck.
3. Chaka death
When there is no electricity, use a screwdriver to rotate the impeller to check if it is flexible. If a certain angle is stuck or not flexible, it is necessary to clean the cement, stones, weeds and other dirty things inside, or carefully use a screwdriver to manipulate the impeller when powered on to help it start and pour out the stones. Attention must be paid to safety during operation to prevent hands from getting entangled.
Summary: As long as the water pump does not leak electricity, its resistance meets the requirements, and it is not stuck, it means there is no problem.
