Undervoltage protection issues, what is undervoltage protection

1.The meaning of the jumper in the second section is: if it is a three-phase, connect AC or AB or BC, according to the principle, this needs to detect the actual voltage, so it needs to be connected in this way. If it is a single phase, it is connected to the neutral line and the live wire.

2."Its dynamic contact is connected in series in the contactor control loop", which means that this contact is used to control the opening and disconnection of the entire control loop, for example, after connecting the control loop, then remove the wire where it takes the power supply, and connect this contact in series.

The voltage that causes the motor to fatigue is called the critical voltage. When the line voltage is reduced to a critical voltage, the action of protecting the appliance, called undervoltage protection, is mainly tasked with preventing the equipment from burning out due to overload. When the voltage of the circuit is lower than the critical voltage protection electrical appliance is called loss of voltage protection, its main task is to prevent the motor from starting spontaneously.

This jumper means that if it is three-phase, connect AC or AB or BC, according to the principle, this needs to detect the actual voltage, so it needs to be connected like this. If it is a single phase, it is connected to the neutral line and the live wire.

The dynamic contact is connected in series in the control loop, which means that this contact is used to control the opening and disconnection of the entire control loop, for example, after connecting the control loop, remove the wire where it takes the power supply, and connect this contact in series.

It is to connect the wires on the normally open point circuit of the relay in series to the coil of the contactor.

Legal analysis: under-voltage protection refers to when the motor is operating normally, the power supply voltage is excessively reduced, Suixian will cause the motor speed to drop or even stall, and when the load torque is constant, the motor current will increase sharply to cause overcurrent. In addition, if the voltage is too low, it will cause some electrical appliances to release current, and the control circuit will not work properly, which may cause accidents.

Therefore, when the voltage drops to the minimum allowable value, the power supply needs to be cut off, which is undervoltage protection. Its task is primarily to prevent the equipment from burning out due to overload.

Legal basis: Article 24 of the Electricity Law of the People's Republic of China The State shall implement the management principles of safe electricity use, saving electricity and planned electricity consumption for the supply and use of electricity. The method of electricity and use shall be formulated by the law in accordance with the provisions of this law.

Legal analysis: The main reasons for the undervoltage of electrical equipment are as follows. 1. The voltage of the power supply line itself is unstable.

2. The working current of the circuit load is large (such as the start of large equipment). 3. There is a short circuit in the power supply line. 4. The transformer capacity is insufficient or malfunctioning.

Undervoltage refers to a long-term voltage fluctuation phenomenon in which the root mean square value of AC voltage decreases at power frequency, is less than 10% of the rated value, and lasts more than 1 minute.

Legal basis: Electricity Law of the People's Republic of China

Article 52 No unit or individual may endanger power generation facilities, substation facilities, power line facilities and their related auxiliary facilities。

Blasting and other operations that may endanger the safety of power facilities around power facilities shall be carried out in accordance with the provisions on the protection of power facilities, and the operation can only be carried out after approval and measures to ensure the safety of power facilities are taken.

Article 53 The electric power management department shall, in accordance with the provisions on the protection of electric power facilities, set up signs for the protection of electric power facilities。

No unit or individual shall construct buildings or structures that may endanger the safety of electric power facilities, plant plants that may endanger the safety of electric power facilities, and shall not pile up articles that may endanger the safety of electric power facilities.

Plants that have been planted before the demarcation of the power facilities protection zone in accordance with the law obstruct the safety of the power facilities shall be pruned or cut down.

Article 54 When any unit or individual needs to carry out operations that may endanger the safety of electric power facilities in the protection zone for electric power facilities demarcated in accordance with law, it shall obtain the approval of the electric power administration department and take safety measures before carrying out the operation。

Article 55 When electric power facilities and public works, afforestation projects and other projects obstruct each other in the course of new construction, reconstruction or expansion, the units concerned shall negotiate in accordance with the relevant provisions of the State and reach an agreement before construction。

Hello! Undervoltage protection is a protection mechanism set to protect the battery from over-discharge. If the battery voltage is too low, the undervoltage protection automatically shuts down the device to avoid damage to the battery.

To remove the undervoltage protection, the method is as follows:1Charging:

Restart the device by connecting it to a reliable power source to charge it, allowing the battery to be fully charged. 2.Replace the battery:

If the battery has aged or is damaged, the battery may need to be replaced to remove the undervoltage protection. 3.Adjust Voltage:

If the device supports voltage scaling, you can try to adjust the voltage to suit the current code age usage environment. 4.Check the battery connection:

If the battery is poorly connected, it may cause undervoltage protection. Check the battery connector to make sure the connection is secure. It should be noted that if the battery has been damaged, the battery may need to be replaced to remove the undervoltage protection.

1. Under-voltage protection refers to the action of protecting electrical appliances when the line voltage is reduced to a critical voltage, and its task is mainly to prevent the equipment from burning out due to overload.

2. Due to short-circuit faults and other reasons, the electric rubber voltage of the line will be greatly reduced or even disappeared in a short time. It can cause damage to wiring and electrical equipment. For example, the motor is fatigued and stalled, resulting in several times the rated current.

overcurrent, burned out the motor; When the voltage is restored, the self-starting of the motor will cause the voltage of the motor to drop significantly, causing harm.

3. When the voltage of the circuit is lower than the critical voltage, the action of the protective electrical appliance is called loss of voltage protection, and its main task is to prevent the motor from starting spontaneously.

Pro, under-voltage protection generally refers to the protection mechanism of electrical equipment or electrical appliances when the power supply voltage is lower than the set value, in order to prevent equipment failure or damage, the protection mechanism of automatic power cut-off. If there is an under-voltage bending protection, you can try the following methods to remove:1

First, check whether the connected power supply is in the right gear, and whether the power supply voltage is lower than the requirements. 2.Check whether the electrical appliance itself is overloaded or other abnormalities, resulting in an instantaneous excessive current and undervoltage protection.

If there is any abnormality, solve it in time. 3.Try to restart the electrical device, if the protection is removed, it means that the current of the electrical device suddenly increases at the moment of starting, causing the protection to be triggered.

4.If the above methods still cannot solve the problem, you can check the manual of the electrical equipment to understand the detailed cause of the trigger of the under-voltage protection, and follow the method on the manual to remove it.