The quality of the 220 pump, how to measure the quality of the 220 volt pump

Pumps can usually be divided into three categories: positive displacement pumps, power pumps, and other types of pumps according to their working principle. In addition to classifying by working principle, it can also be classified and named in other ways. For example, according to the drive method, it can be divided into electric pump and water wheel pump; According to the structure, it can be divided into single-stage pump and multi-stage pump; According to the use, it can be divided into boiler feed pump and metering pump, etc.; According to the nature of the conveyed liquid, it can be divided into water pump, oil pump and mud pump.

There are many types of pumps, which can be divided into the following according to the working principle: Power pump, also known as impeller pump or vane pump, relies on the dynamic action of the rotating impeller on the liquid, continuously transmits energy to the liquid, so that the kinetic energy (main) and pressure energy of the liquid increases, and then converts the kinetic energy into pressure energy through the extrusion chamber, which can be divided into centrifugal pumps, axial flow pumps, partial flow pumps and vortex pumps. Positive displacement pumps, relying on containment liquids....

Shake the meter can not shake the zero fire end, it is meaningless, it is the resistance between the wire and the shell, and the capacitor cannot be shaken, you have to use a multimeter.

Measure the quality of the 220-volt pump: the multimeter hits the resistance to 10 gears, and measure whether the pump circuit is unblocked: if the pointer or instrument data does not move, the pump circuit has a problem; If the pointer moves, the basic wiring of the pump is intact.

The insulation of the measuring pump is the same as above, the multimeter hits the resistance to 10 gears, one end measures one of the two power cords of the pump, and the other end measures the pump shell: if the pointer swings, the pump leaks, indicating that the pump seal is damaged, and the coil has accumulated water.

1. The mains voltage is relatively low, resulting in poor contactor engagement.

2. There is a short circuit in the water pump, which causes the circuit voltage to decrease, resulting in poor contactor suction.

3. The relay coil is 380V.

4. There is an error in the wiring of the line.

After installing the fuse according to the power, take the switch directly and try it.

If the insurance does not boil the water, there is no problem if the pump can be discharged.

Multimeter detection method of single-phase water pump:

1. Measure the insulation of the water pump and turn the digital multimeter to the maximum gear of 200m. One watch pen is connected to the water pump housing, and the other is connected to the winding. If the insulation breaks down, the resistance is zero.

2. Coil resistance measurement, the pen is directly connected to the coil, if the resistance is infinite, it means that the coil is damaged. Otherwise, there is no damage.

Multimeter, also known as multiplex meter, multi-meter, three-purpose meter, multi-meter, multi-meter, etc., is an indispensable measuring instrument for power electronics and other departments, generally for the main purpose of measuring voltage, current and resistance.

Multimeters are divided into pointer multimeters and digital multimeters according to the way they are displayed. It is a multi-functional, multi-range measuring instrument, generally multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, and some can also measure AC current, capacitance, inductance and some parameters of semiconductors (such as).

Basic functions of the multimeter:

The multimeter can be used not only to measure the resistance of the object to be measured, but also to measure the AC and DC voltage. There are even multimeters that measure the main parameters of transistors and the capacitance of capacitors.

Being proficient in the use of a multimeter is one of the most basic skills in electronic technology. Common multimeters are analogue multimeters and digital multimeters.

The analog multimeter is a multi-functional measuring instrument with a meter head as the core component, and the measured value is indicated and read by the meter head pointer. The measured values of the digital multimeters are displayed digitally directly on the LCD screen, which is easy to read, and some have a voice prompt function.

A multimeter is a common meter head, which integrates voltmeter, ammeter and ohmmeter. The DC current level of the multimeter is a multi-range DC voltmeter. The voltage range can be extended by parallel connection of the meter with a closed-circuit divider.

The DC voltage level of the multimeter is a multi-range DC voltmeter. The voltage divider resistor can be extended by connecting the voltage divider in series at the meter head. Depending on the voltage divider, the corresponding range is also different.

The head of the multimeter is a magnetoelectric measuring mechanism, which can only use direct current, and use diodes to change AC to DC, so as to realize the measurement of alternating current.

If the motor is damaged, the water pump and other motors can only be measured with a multimeter to determine whether the coil is abnormal, it is difficult to detect whether the motor leaks electricity to the ground, to judge the quality of the motor, measure the coil with an external meter, and measure the insulation resistance with a megohmmeter to ensure that the motor does not leak from the ground when running.

Friendly reminder, it is best not to touch the two terminals of the megohmmeter when it is used, and there is electricity.

See if the resistance value is normal. Then see if the insulation is good.

There are three points: 1) use a megohmmeter to measure the insulation resistance of the winding, and more than 1 megaohm is qualified; 2) Use a multimeter to measure the resistance value of the three phases, and the normal resistance value of the three phases is the same (three phases); 3) Use a multimeter to measure the resistance between the common end, the running winding and the starting winding, and the maximum resistance is equal to the sum of the two finer resistance values (single-phase) under normal conditions. If the windings are burned, just disassemble the pump and smell the burnt paint.

According to the size of the pump, the winding method of the 220V pump is different from the motor, generally 550W motor, the main winding is about 5 ohms, and the starting winding is about 10 ohms. 0 in the case of a short circuit...

There are several scenarios when a motor is broken:

1. The coil is broken, measured with a multimeter, and it doesn't work.

2. The coil is burned out and short-circuited, and the coil is measured with a multimeter, which is straight-through.

3. The starting capacitor is broken, measure the coil with a multimeter, normal, on.

4. The shaft core of the motor is locked, the motor does not rotate, if the coil has not burned out, it is also common to measure the coil with a multimeter.

If there is a capacitor, remove the capacitor, and the meter hits the R gear when measuring, do you measure the ground first?

It is judged by measuring the resistance value of the motor winding.

Use a multimeter 10k file to measure the resistance of three groups of coils and shells. One end of the multimeter is connected to one of the phases of the two power cords of the water pump, and the other end is connected to the water pump shell, and the resistance value is more than 1m ohm (low power is above the euro) is normal. All three of the power cords are measured.

The purpose of the measurement is to measure whether the motor has good insulation properties to the housing.

With a multimeter, you can only make a preliminary judgment. The multimeter hits the resistance to 10 gears, measures whether the pump circuit is unblocked, and the pointer or meter data does not move, then the pump circuit is problematic, and if the pointer moves, the basic circuit of the pump is intact.

To use a multimeter to measure, replace the capacitor of the same capacity, and if it can run well, it means that the original is bad.

You can use the resistance level of the multimeter to test the quality of the capacitance. The method is as follows: dial the resistance level of the multimeter to 10 or 100 gears, connect the red and black watch pens to the capacitor poles arbitrarily, the watch hand begins to return to the bottom of 0 very quickly, and then slowly rises, and finally rises to infinity, and then the red and black watch pens are exchanged and measured again, which can reach infinity means that the capacitance is good, and if it cannot rise to infinity, it means that the capacitance quality is problematic.

You can also replace it with a good capacitor to see if the capacitor is good or bad.

Test with voltmeter and ammeter.

If the capacitor is broken, it can't be started at all, so you can judge what.

Detect the resistance value of each winding of the motor.

Detect the value of insulation resistance between the winding and the housing.

Use the capacitance file of the digital multimeter or the digital capacitance meter to detect whether the capacity of the capacitor is normal After the above test, you can conclude that the electrical performance of the 220V submersible pump is good. You can go into the water to test the machine, and remember not to work with electricity for all the tests. Before capacitance detection, remember to use the meter rod to short circuit both ends of the capacitor below in order to discharge the charge in the capacitor and prevent the residual charge from damaging the instrument.

It can detect whether the resistance of each winding is basically the same, whether the winding has a short circuit or open circuit, and measure the insulation resistance with a megohmmeter.

In the initial stage of power-on, use a clamp meter to measure the current of the three phases (three wires) respectively, if the current on the three wires is basically equal and similar to the nominal current, it means that the pump is good, otherwise it is bad. Note that the initial power-on time should not be too long, and the power-on operation can only be carried out for a long time after the measurement is normal.

Three-phase pumps, for example. Multimeter resistance range 200 ohms. The resistance of the three phases is the same. The resistance shakes the meter, one end is connected to the motor binding post, and the other end is connected to the water pump sheath to see how much the insulation is. Generally, it is more than 5 trillion ohms. Zero means the motor burned.

Break the circuit with a multimeter. Grounding is OK. Short circuits can only be measured with a bridge.

To test the resistance value of each phase stator winding, whether it is balanced, the insulation resistance of each phase of the stator winding to the ground is not less than megaohms, if it is a single-phase capacitor motor, the capacitance should be checked, the capacitance decreases, the output torque of the motor decreases, although it can run, it is difficult to pump water. Also check the lubrication of the bearing of the pump motor, if there is no problem with the above inspections, start the pump to see if the water can be used, and use the clamp ammeter to test whether the running current is within the rated current range of the nameplate, if the running current is problematic, check whether the mechanical part of the pump is stuck.

Electrical: Use a multimeter to test the resistance between phases, the resistance between phases of three phases is the same, and the resistance of single phase is different. There is also a test of the insulation of the shell, and the insulation should be good.

Mechanically: Rotate the rotor by hand, and after the hand stops, the rotor should be able to rotate freely.

Use a multimeter to measure whether there is any leakage.