Midea s SH2130 induction cooker has a power outage at home when boiling water and steaming rice

This is a fault in the external wire circuit, the power used by the induction cooker is very large, nearly 10 amperes, which is greater than the electricity consumption of 1 horsepower air conditioner, so your circuit must supply more than 10 amps of current, and there are other electrical appliances at home that also use electricity. The induction cooker is normal, and each induction cooker has a protection circuit and a fuse inside, and the failure will generally protect itself and will not cause a power outage in the external circuit. Find an electrician to see if the line is leaking or the line is small.

It may be that there is a leakage, which causes the safety button at home to trip automatically, so check it well.

My rice cooker is like this, I thought it was a problem with the electric board, and I still can't solve the problem when I take it apart. Later, I found out that there was water in the place where the cable was plugged in below, and it might be a leak, so I wiped it clean with toilet paper and it was fine. It's probably the residual water that runs down when the porridge is cooked.

Oh oh · like you said the problem should be that there is a problem with the power supply line in your home, that is, the connector contact is not good·· Because the power of the induction cooker is 2000w, the line requirements are strict, it is recommended that you still use a special line to supply power to the induction cooker, so safe

There is a problem with the wiring of the house, which may be related to the wiring of the house. Have an electrician check it carefully.

Try it with other electrical appliances with similar power, if the other is okay, it is still an induction cooker. Ask the master to come to your door to see.

The wiring in your house has a bad contact, and the wires are 2 square millimeters, and all the joints are tightened again, and I'm the electrician, and I'm right

The line joints are oxidized and rusty, and they should be repaired.

This bad analysis doesn't seem to be a problem with the induction cooker.

The scheme of boiling water in the induction cooker is fully automatic, that is, the artificial non-adjustable fire power is not adjustable. As soon as you burn and stop at home, it will be normal to go to the merchant, and there may be:

1. The location of the use does not meet the requirements of the working environment of the induction cooker. If not ventilated.

2 The pot used does not meet the requirements. For example, the bottom of the pot is uneven; Too small.

3 Continuous use may also cause overheating protection.

4。There are interference sources in the vicinity that affect the power supply, resulting in the induction cooker cannot be stably located under high-frequency working conditions.

Usually the cause is an overcurrent in the main circuit or a power tube.

C-pole overvoltage protection.

Use. R-1R European block test main loop power fall.

There is no leakage of electricity in the whole bridge.

No problems were found with the potentiometer VR1 in the current detection circuit.

Each supply voltage is measured in standby mode. 5v

18v300v.Basically normal.

And then go down to the test from.

300V.

2w.Both sets of output voltages with large resistors are.

2V is normal.

Each supply voltage is measured in standby mode.

The voltage of each pin of LM339 is also normal.

Measure each resistance when it is not powered on.

Push the transistor.

Didn't find any problems.

Measure it at the end.

Diodes...Regulator tubes...Found.

v.Heating regulator diode variable value.

The problem is solved.

Get back the same.

The 18V regulator tube is installed on the test machine and works normally.

There is a fault, so the induction cooker is protected and cannot be turned on.

The circuit involved in the failure of the pot is the pot detection circuit.

Testing steps: 1. Check whether the diameter of the pot is consistent with the requirements, please use MD special pots. Check the two terminals of the coil reel for looseness.

2. Measure whether there is a problem with R35, R36, R37, R7, C16, C17, R13 and D19 of the pot detection circuit. Check whether the power supply of the IC2 comparator is normal, and check whether there is a 5V voltage on the resistor R13.

r. The fuse is blown.

Detection procedure: If the fuse is blown, it cannot be turned on immediately after replacing the new fuse. First of all, use a multimeter to find out whether there is a short circuit between the rectifier bridge stack and IGBT, and whether there is a problem with ZRN300, C300, C14, etc., usually when the fuse is blown, the rectifier bridge stack and IGBT both components are also broken down.

S, as soon as the machine is turned on, the fault **E01 (zero-crossing detection) will be displayed

The failure of the E01 as soon as it is turned on is due to a problem with the zero-crossing detection circuit.

Detection steps: 1. Detect whether D300, D301, R308, R70, R71, C40, C11, and Q4 are damaged.

2. Measure whether there is voltage on the 17th pin of the main control IC, if there is voltage, it means that the zero-crossing detection circuit is working normally, and the problem may appear in the main control IC itself. If the voltage is close to 5V, it means that the fault is still in the zero-crossing detection part, and the above components are checked again.

T. The power cannot be adjusted (high-voltage protection of IGBT).

When the C-pole voltage of the IGBT is higher than 1135V, the protection circuit will act. At this point, the IGBT output power decreases.

Detection steps: Use a multimeter to measure whether there is a device problem in R51, R56, R42, R20, C18, and C31. Measure whether the first pin of the IC2 comparator LM339 is low. If it is low, it indicates that the IGBT high voltage protection operation.

In this case, in addition to the above components, it is likely that the comparator LM339 is damaged.

u. The power cannot be adjusted (current protection).

When the working current of the whole machine is too large, the output power will be reduced in order to protect the IGBT from damage. When the protection is lifted, the power can be adjusted, otherwise the fault is not eliminated, and the power is not adjustable.

Detection steps: Check whether Q5, R43, D16, Z6, Z2, and EC6 are short-circuited. Measure whether the negative pole of the regulator tube Z2 is. If the voltage is in the breakdown state, the negative voltage of Z6 should be greater than that, so the fault is in the current detection part.

Let's check D2-D7, R5, R24, VR1, R50, R31, CT300 for problems.

If there is no problem with the above components, then it may be that the resistance value of the VR1 adjustable resistor has changed, adjust the adjustable resistor to the appropriate resistance value, troubleshooting.

v. The panel buttons are not responding or are not fully displayed.

I have come across one, it is caused by a 5V short circuit caused by the boot switch, press the boot button, the 5V voltage disappears, and the 5V voltage is restored when you release it. Finally, the reason is that there is a short circuit at the socket of the light board.

You see the quality of this stove is not bad, it may be that the switch micro switch is broken, you can open the short circuit yourself to see if it can be opened, if it doesn't work, find after-sales it, if it is a product before 08 years, it is recommended to repair it.

Usually the cause is overcurrent in the main circuit or C-pole overvoltage protection of the power tube.

Use the R-1R European block to test the power drop in the main circuitThere is no leakage of electricity in the whole bridge. No problems were found with the potentiometer VR1 in the current detection circuit.

In standby mode, measure the voltage of each power supply 5V 18v . 300v .

Basically normal. Then go down to the . connected from 300V 2w .

It is normal for both sets of output voltages with large resistors to be between -2V.

In the standby state, the voltage of each power supply is measured and the voltage of each pin of LM339 is also normal.

Measure each resistance when it is not powered on. Pushing the transistor did not find any problemsFinally, measure the diodeRegulator tubes...Discover 18 vThe problem of heating regulator diode variable value has been found.

Find the same 18V regulator tube and install it on the test machine to work normally.

1. Switch the current working mode to see if it can return to normal.

2. Shut down, after half an hour, re-energize to see if it is normal, if it is normal, it is generally the protection caused by the current internal temperature is too high.

3. If none of the above is invalid, there may be a hardware failure, it is recommended to contact the official after-sales service center and the engineer will help check and deal with it.

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