Show The Cause And Solution Of The Freezer Freezer Trip

The first situation: the main switch trips, showing that the main switch trips once the freezer compressor is started. The most common one is that the main line uses too many electrical appliances, especially in summer when the weather is overheated. In order to prevent the indoor temperature from being too high, The use of air conditioners, fans and other electrical appliances together results in excessive power and the operation of the main switch load, resulting in tripping.

The second reason: Supermarket freezer freezers will trip after a period of use. This situation is generally an overload phenomenon, but it may also be an insulator leakage phenomenon. First, if a trip occurs, push the leakage fast to close. If you can't push it for more than a minute, it means it is overloaded. If you can push it right away and the trip switch does not generate heat, then it is possible that the line insulator is lowered or the electrical insulator is lowered.

The reason why the insulator of the freezer is lowered.

1. Supermarket freezers and freezers will be equipped with leakage switches. If the voltage is unstable, the leakage switch in the freezers will trip. This can be judged to be the cause of the freezer and freezer that caused the trip. For this, you need to contact the manufacturer’s after-sales maintenance technician. deal with.

2. The main switch of the supermarket freezer freezer has tripped, and the display freezer does not trip, which means that the load problem or the line insulator is reduced. I also said that if it is a load problem, the main switch will be hot. If it does not, it will be a line problem.

3. The freezer freezer itself does not have a leakage switch installed, and the main switch has tripped. This phenomenon occurs. Use the troubleshooting method to unplug the display freezer socket and open the switch. Then test the line insulation. Use a shaker to measure the insulation between the ground and the working wire of the freezer. If the insulation decreases, the number of trips will generally increase over time.

4. If the trip is caused by the freezer and freezer, there are two possibilities. First, the current required by the freezer and freezer exceeds the current of the total switch, and the sensitivity of the total switch is too high. The second is that the internal insulator of the freezer is reduced and electricity is used. Gongbi can test whether there is electricity outside the case.

Show that the freezer turns off the lights and trips.

Generally, there are three reasons: the first power supply is short-circuited; the second refrigerator has internal leakage; the third refrigerator fan capacitor, compressor capacitor failure.

When the refrigerator is turned on for refrigeration operation, the compressor will trip as soon as it is started, and the internal unit is operating normally in a separate test, so it is judged that the fault lies in the outdoor unit. Open the outer casing and check the resistance at both ends of the power line L and N to confirm that there is no short circuit or short-circuit to the ground between the two wires, and then check the outdoor unit components one by one. When the compressor capacitor is checked, it is found that the capacitor has broken down and short-circuited; Replace the compressor capacitor, the test machine is normal.

Inductive leakage.

When the refrigerator starts to run, the cooling and control components in the box are normal, and there is a feeling of numbness when touching the box with your hands, indicating that the refrigerator has induction leakage. Slight inductive leakage cannot be detected with a test pen. For example, the neon bulb of the test pen is bright, indicating that there is a serious inductive leakage in the refrigerator. The reason is: because the control circuit of the refrigerator compressor and the lighting circuit in the refrigerator pass between the cabinet shell and the inner wall, there is a certain distributed capacitance in itself, and the compressor is an induction motor, and a self-induced electric potential is generated on the rotor. . During the operation of the compressor, if for some reason, the distributed capacitance and self-inductance are increased, the induced current on the box will increase. At this time, if there is no reliable grounding wire, when a human hand touches the cabinet, hemp inductance will occur. The troubleshooting method is to lead the wiring at the refrigerator grounding wire position to be reliably grounded. For safety reasons, do not connect the refrigerator grounding wire to the gas pipe.

The connector is loose, causing poor grounding and leakage.

When the cabinet is found to have hemp inductance, use a megger to measure the insulation resistance between the compressor winding and the casing to be greater than 2.5MΩ, indicating that the insulation between the circuit part and the cabinet metal is normal, and it can be judged that the fault lies in the power socket, such as The ground wire of the socket is deformed and loose, causing the refrigerator's metal shell to not be grounded and causing electric leakage. In this case, just repair the socket ground and make it well grounded to eliminate the fault. For the leakage fault of the refrigerator that has just been used, it is necessary to consider whether there is a phase wire connected to the shell, or the phase wire is connected to the ground wire by mistake. It should be checked and ruled out one by one.

The internal leakage of the refrigerator is divided into the following categories.

Leakage of waterproof cable.

The leakage of waterproof cable is generally common in refrigerators that have been used for a long time. The phenomenon is that after the power is turned on, the overload protection relay is frequently turned on and off, the compressor cannot be started, the cabinet is electrified, and there is hemp inductance when touched by hands. The power supply voltage is normal, and the DC resistance of each winding of the compressor is measured with the "ohm" block, and there is no short circuit between each winding to the ground. Checking the temperature control circuit and the lighting circuit can not find obvious problems. This situation can be judged as the aging of the waterproof line or the breakdown of the waterproof line insulator. After the waterproof cable is wet, the resistance between its two cores will be below 1MΩ (normally it should be infinite), which causes the waterproof cable to have low insulation resistance and the power supply breakdown under the influence of external factors due to condensation. Leakage, resulting in insufficient power supply voltage, excessive compressor current and abnormal operation of the compressor, and the protection relay repeatedly trips. The waterproof wire can be covered with an insulating sleeve. The best way is to remove the old waterproof cable and replace it with a rubber waterproof cable.

The above is about the specific causes and solutions of the refrigerator trip. See you next week.

Sanye is a 15 year old brand of commercial refrigeration equipment in China. If you have any questions, you are welcome to consult. At the same time, you are also welcome to order products.https://www.freezer-china.com/