How can I tell if the resistor brake has been damaged?

Judging the quality of the braking resistance is very simple, first remove the connection line with the equipment, and use a multimeter.

The measured resistance value is compared with the nominal resistance value, and the appearance has burn marks to directly judge the damage.

There are two cases of resistor damage: 1The internal circuit of the resistor is burned out Measured with a voltmeter The resistance is infinity or the resistance is damaged by the voltmeter diode file The on-off circuit is not connected and the resistance is damaged 2

Resistor internal short circuit Use voltmeter diode file to measure on and off Internal short circuit resistor damage resistor.

The quality of the resistance in the unenergized state.

Look at the temperature of the resistance when it is energized.

Summary. The consequences of damage to the brake resistor can affect the performance of the entire braking system, leading to brake failure and increasing the risk of driving.

The consequences of damage to the brake resistor can affect the performance of the entire braking system, leading to brake failure and increasing the risk of driving.

Can you add, I don't quite understand it.

Brake resistor is an important part of the automobile braking system, and its main role is to convert braking energy into heat energy and dissipate it to achieve the purpose of braking. However, if the braking resistor is damaged, it will have a negative impact on the driving safety of the car. First of all, the damage of the braking resistance will lead to the reduction of braking ability, and the long-term accumulation of the blue belt will lead to the prolongation of the braking distance, which increases the probability of accidents. In addition, after the brake resistor is damaged, there may be circuit interruption, current overload and other faults, which will cause the driver to be unable to control the braking of the car and endanger safety.

Therefore, once the braking resistor is found to be damaged, it should be replaced in time to ensure the normal operation of the automobile braking system and ensure the driving safety of the driver and the vehicle.

Of course, the use efficiency is an important basis for judging the quality of a braking resistor. Only when the utilization rate reaches the maximum power is the most obvious, the utilization rate of the braking resistance stipulates its use efficiency, and the general selection should take into account that the power has a balance, and can not run at full power for a long time, so as to avoid the damage of the braking resistance overheating, and then affect the braking effect of the braking unit.

The lower the usage rate of the braking resistor, the smaller the degree of heating, the less energy consumed on the resistor, and the worse the braking effect. At the same time, the capacity of the braking unit was not fully utilized. When the braking resistance usage rate is 100%, the braking effect on the braking unit is the most obvious, but the braking resistor with higher power is required, and many factors need to be considered comprehensively in practical application.

After determining the braking resistance and power, it is recommended to choose a lower resistor usage rate for large inertial loads that slow down. Otherwise, a larger braking resistor usage rate is chosen. The braking resistor has two characteristics, which is to protect the inverter and ensure the power supply network.

When the protector stops the motor quickly, due to the inertia it will produce a large amount of regenerative capacity, if it does not consume this part of the regenerative energy in a timely and effective manner, it will directly act on the dedicated DC circuit part, and the inverter will report a fault in the light case, and may even damage the inverter in serious cases; The purpose of the braking resistor is to dissipate this regenerative energy.

Braking resistor, a kind of corrugated resistor, is mainly used in the mechanical system where the inverter controls the motor to stop quickly, helping the motor convert the regenerated electrical energy generated by the rapid stop into heat energy.

Reasons for bad braking resistors:1The resistance does not match the inverter, and the power is too small;

2. Frequent start and stop.

3. The motor stop time is set too short.

4. Poor heat dissipation conditions, it may be that the fan is broken, or the air duct is blocked, 5. The quality of the resistor itself.

3.The braking resistor is a carrier used to consume the regenerative energy of the motor in the form of thermal energy, which includes two important parameters: resistance value and power capacity. Usually in the engineering is more used corrugated resistors and aluminum alloy resistors

The corrugated resistor adopts vertical surface corrugation to facilitate heat dissipation and reduce parasitic inductance, and uses a highly flame-retardant inorganic coating to effectively protect the resistance wire from aging and prolong the service life. The aluminum alloy resistor is easy to install tightly, easy to attach radiators, beautiful appearance, and the aluminum alloy outer box with high heat dissipation is fully encapsulated, which has strong vibration resistance, weather resistance and long-term stability; Small size, large power, easy and stable installation, beautiful appearance, widely used in highly harsh industrial environments.

The braking resistance is red because when the motor brakes, it turns into a power generation state, and the electric energy is emitted to raise the DC bus voltage. Therefore, when the braking resistor turns red, it is important to cut off the load on the inverter. After the load is removed, under normal circumstances, the DC bus voltage drops, the braking resistor will be removed, and the resistor will no longer generate heat.

If the braking resistor is still on, the input power supply of the inverter can be disconnected.

The fundamental way to solve the problem is to configure a reasonable braking resistor according to the braking energy consumption, or set a reasonable braking time according to the braking resistor configuration. The longer the braking time, the less energy dissipated the braking resistor.