The inverter reached 10hz and was short circuited for what s the reason

This situation mostly occurs in the case of light load starting. It is typical that when the centrifugal fan or water pump implements frequency conversion speed regulation, the torque increase is preset too high. Because the resistance torque of centrifugal fans and pumps at low speed is very small, if the torque increase is preset high, it is equivalent to a high voltage at this frequency, the magnetic circuit of the motor is seriously saturated, and the excitation current produces a large spike wave, which exceeds the rated current of the inverter.

Analysis of the causes of overcurrent tripping:

1) When restarting, it trips as soon as the speed is raised. This is a very serious manifestation of overcurrent.

The main reasons are:

1) Short circuit on the load side 2) The working machine is stuck 3) The inverter tube is damaged 4) The starting torque of the motor is too small and the drag system cannot rotate.

It does not trip immediately when it is restarted, but trips during operation Possible reasons are:

1) The ramp-up time is set too short 2) The deceleration time is set too short 3) The torque compensation setting is large, which causes the low-speed no-load current to be too large 4) The electronic thermal relay is improperly set and the action current is set too small, which causes the misoperation voltage tripping.

The main reasons for overvoltage tripping are:

1) The power supply voltage is too high 2) The speed reduction time is set too short 3) During the speed reduction process, the discharge unit of regenerative braking is not working well aIf it is too late to discharge, an external braking resistor and braking unit b. should be addedThe discharge branch fails, but it is not actually discharged.

The possible reasons for undervoltage tripping are: 1) the power supply voltage is too low, 2) the power supply is out of phase, and 3) the rectifier bridge is faulty, and the motor does not rotate.

There are many reasons for the short circuit of the inverter, such as: the power supply voltage is too high, the speed reduction time is set too short, and the discharge unit of regenerative braking is not working well during the speed reduction process.

a.If it is too late to discharge, an external braking resistor and braking unit should be added.

b.The failure of the discharge branch, the actual discharge, etc., may lead to the short circuit fault of the inverter.

Frequency converters. 1. Overvoltage (OU).

The overvoltage alarm generally appears when the machine is stopped, and the main reason is that the deceleration time is too short or there is a problem with the braking resistance and braking unit.

2. Undervoltage (UU).

Undervoltage is also a problem that we often encounter in use. The main reason is that the main circuit voltage is too low (220V series is lower than 200V, 380V series is lower than 400V), the main reasons: a certain way of the rectifier bridge is damaged or there is abnormal work in the three thyristors, which may lead to the occurrence of undervoltage faults, and secondly, the main circuit contactor is damaged, resulting in DC bus voltage loss on the charging resistor, which may lead to undervoltage.

There is also the problem of undervoltage due to the failure of the voltage detection circuit.

3. Overheating (OH).

Overheating is also a relatively common fault, the main causes: the surrounding temperature is too high, the fan is stalled, the temperature sensor performance is poor, and the motor is overheated.

Fifth, the output is unbalanced.

The output imbalance is generally manifested as motor jitter and unstable speed, the main reasons: bad module, bad drive circuit, bad reactor, etc.

Kiss! We've been waiting for you! There are several reasons for a short circuit after the inverter is shut down

1.Supply voltage is too high: If the supply voltage exceeds the rated voltage range of the drive, it may cause damage to the drive or a short circuit.

2.Poor cable contact: After the drive is shut down, the cable connection may become loose or loose, resulting in poor contact and thus a short circuit.

3.Cable breakage: If the cable is damaged, such as surface abrasion, cutting, or crushing, it can cause the cable to be short-circuited.

4.Faulty Capacitors: Capacitors in the inverter, if faulty or aged, can cause the capacitor to be short-circuited, resulting in a short circuit of the entire inverter.

5.Other faults: Other faults inside the drive, such as damage to the inverter, can also cause a short circuit in the drive.

If there is a short circuit after the inverter is shut down, it is recommended to stop the operation immediately, check whether the power supply voltage is normal, check whether the cable connection is good, check whether the cable is damaged, check whether there is a fault inside the inverter, and contact the manufacturer or professionals for maintenance as soon as possible.

The power frequency starts normally, and the frequency conversion starts trip at 10 Hz.

Hello dear, I'm glad to answer for you. The power frequency starts normally, and the frequency conversion starts trip at 10 Hz for the following reasons:1

Problems with the motor itself: Short circuit in the windings of the lifter, damage to the insulation and other problems may cause the motor to fail to start normally. 2.

Inverter parameter setting problem: The parameters may be set unreasonably, such as overcurrent, overvoltage and other protection parameters. 3.

Power supply problems: Inverter input power problems, such as unstable voltage, low voltage, etc., may cause the inverter to fail to start. The handling of this situation can be done by following these steps:

1.Check the insulation condition of the motor and whether there are problems such as short circuit in the winding, and replace and repair in time if there is a problem. 2.

Check whether the parameters of the inverter are set correctly, and if they are incorrect, set the parameters again. 3.Check whether the power supply voltage is stable, and if the voltage is too low, adjust the voltage or replace the power supply.

If there is still a problem, it is best to ask a professional to carry out maintenance and repair.

The power frequency starts normally, and the frequency conversion starts trip at 10 Hz.

When the inverter starts, the input AC power supply will be converted into DC power supply through the rectifier circuit, and then the DC power source will be converted into high-frequency AC power supply through the inverter circuit to control the speed of the drive motor. And there may be some problems in this process that cause the drive to trip. For the situation you mentioned, the inverter tripped at 10hz, there could be the following reasons:

1.Low Frequency Limit: Some models of inverters have a minimum output frequency limit, such as 10Hz.

When the output frequency of the inverter drops to 10Hz or less, the protection function will be activated and cause tripping. Dust inspection first 2Overload Protection:

When the load is too large or the torque increases suddenly, it may cause the motor current to increase instantaneously and exceed the rated output capacity of the inverter, and the protection function will be activated and cause tripping. 3.Poor power supply:

If the quality of the AC power supply to the inverter is not good, including waveform distortion, harmonic and other problems, it may also lead to tripping. For the above situation, you can check the following points:1

Check that the inverter used has a minimum output frequency limit; 2.Check whether the connected load is too large or has a large load inertia; 3.Use an oscilloscope to check whether the waveform of the power supply to the inverter is normal.

Summary. Hello dear, glad to answer for you! The answer to what is going on when the power frequency starts is normal, and the frequency conversion starts at 10 Hz is: power supply problems, overload protection, wrong parameter settings, system failures.

The power frequency starts normally, and the frequency conversion starts trip at 10 Hz.

Hello to you, I'm glad to answer for you! Zheng Xiao's power frequency start is normal, and the answer to what is going on when the frequency conversion starts at 10 Hz is: electric source problem, overload protection, wrong parameter setting, and system failure.

Expansion related: The safe operation of the traction power supply system that supplies power to the electric locomotive should be ensured. In the event of an accident, the relay protection device installed in the opening and closing station of the traction substation and the partition pavilion will be activated by the short-circuit current generated by the accident, and the circuit breaker that supplies power to the accident point will be automatically disconnected, and the hail will be different to narrow the scope of the accident, ensure the safe operation of other equipment and supply power to the non-accident line normally.

This action of automatically disconnecting the circuit breaker due to an accident is customarily called "tripping". The main task of the traction substation opening and closing station and the partition pavilion is to supply power to the catenary. In addition to the equipment failure of the traction substation opening and closing station and the partition pavilion itself, the proportion of this situation is very small, and the short-circuit current that causes "tripping" mainly comes from the catenary.

The catenary is in an uninterrupted state of operation, and the electric locomotives under the catenary are constantly performing the busy transportation tasks, as well as the joint coordination of the transportation and public works departments. Accidents in any area can affect the catenary and "trip" the circuit breaker.