The inverter does not need to be started, and there is also a power supply at the output

First of all: after powering the inverter, the control panel.

whether there is a display; If it is not displayed, it means that there is a problem with the power supply part of the inverter, and there is no doubt that this needs to be handled by professional engineers, whether it is the manufacturer's or a third party;

If there is a display, it depends on what is displayed and whether it is a fault or not**. If you don't see a fault**, go and check the fault log.

Possible causes of failure are: contactors in the inverter.

There is a problem, there is no engagement, the power board of the inverter is faulty, the drive board is faulty, the module is faulty, etc.

When you mean having a power supply, you're talking about an electric motor.

Turn it up. I still use it.

Electrometer. Is there power at the test output? If the motor rotates up, it is the control line pressed by the wrong and so on, that is, the power transmission is started, if it is the electric detector test output terminal is electrified, it is normal, and the input and output of the inverter are not isolated.

The inverter does not need to be started, and there is also a power supply at the output

Haven't encountered it before!!

The inverter has no U, V, and W phase voltage output, but there is a normal voltage of more than 500 volts between the main circuit P and N (at both ends of the energy storage capacitor), and the high-voltage indicator light is on.

The DC voltage between the main circuit p and n is normal, indicating that the rectifier, current limiting and energy storage circuits are basically normal, and the braking circuit and inverter circuit are basically normal.

There are also no short-circuit faults. The reason why the inverter has no output voltage is that the inverter circuit does not work, because the possibility of the three upper side arms of the inverter circuit opening at the same time is very small, and the reason why the inverter circuit does not work is that there is no driving pulse.

The driving pulse required by the inverter circuit is generated by the CPU and provided after amplification by the driving circuit, so the reason why the inverter circuit does not work may be that the CPU and the driving circuit are faulty, in addition, if the detection circuit such as overcurrent and overheating of the inverter circuit fails, it will also make the CPU identify the error and stop the output of the driving pulse, in addition, the working voltage of these circuits is provided by the switching power supply, so the failure of the switching power supply will also make the inverter circuit not work.

The fault can be caused by damage to the CPU, drive circuitry, switching power supply, or detection circuitry. Maintenance process: (1) Detect whether the switching power supply has output voltage, if there is no output voltage, the switching power supply should be checked.

2) Operate the inverter and use the oscilloscope at the same time.

Measure whether there is pulse output in the drive pulse output pin of the CPU, if the CPU has pulse output, the fault should be in the drive circuit, it cannot send the drive pulse generated by the CPU to the inverter circuit, if the CPU has no pulse output, the CPU and detection circuit should be checked.

It should be noted that the use of multimeters is prohibited during the power period.

and the oscilloscope directly measure the G pole of the inverter circuit IGBT, because the interference signal may be generated during the measurement, and the IGBT will be damaged by abnormal trigger conduction. In addition, it is strictly forbidden to energize the inverter circuit after disconnecting the drive circuit, because the G pole of each IGBT of the inverter circuit is very easy to be disturbed after being suspended and the C and E poles are turned on, if the upper and lower bridge IGBTs are turned on at the same time, the power supply of the inverter circuit will be directly short-circuited, and the IGBT and the power supply circuit will be burned out.

Hello! We're happy to answer for you! What happens when the inverter starts without voltage output?

1.inverter failure; 2.Incorrect parameter setting of the inverter; 3.

The given value of the inverter exceeds the allowable range; 4.Motor failure, causing the inverter to alarm and stop output; 5.The motor is overloaded, causing the inverter to alarm and stop the output.

The fault of inverter without output is a universal fault, and its failure mechanism and circuit level are also relatively broad.

If the inverter is allowed to run without load, it can measure the voltage on the terminals of the inverter U, V, and W. Some brands of inverters, especially imported brand inverters, are generally not connected to the load and are not allowed to operate.

In addition, even if the voltage can be measured, the measured value may not be accurate. This is because the voltage waveform at the output end of the inverter is a PWM waveform, and the waveform of this PWM wave is very close to the square wave, but the multimeter is designed according to the sine wave filter, so there is no way to measure the relatively accurate voltage value by using some multimeters without harmonic filtering function. Green Wave Jet has done n such tests, after installing the MLAD-SW sine wave filter, it can measure the voltage value of the output end of the inverter relatively accurately.

Measured voltage waveform at the output of the inverter.

There is no load, there is a start command, there is a given speed, and the disassembly is correspondingly at the output end of the variable frequency travel width, and the voltage can be measured.

If there is no start command, or if the speed is 0 and the parallel is clear, then the voltage is also 0

1. Inverter failure;

2. The parameter setting of the inverter is incorrect;

3. The given value of the inverter exceeds the allowable range;

4. Motor failure, causing the inverter to alarm and stop output;

5. The motor is overloaded, causing the inverter to alarm and stop output;

6. The power cable is broken and short-circuited, causing the inverter to alarm and stop output.

From the perspective of efficiency, the following points should be paid attention to when selecting the power of the inverter:

1. When the power value of the inverter is equivalent to the power value of the motor, it is most suitable to facilitate the operation of the inverter under high efficiency value.

2. When the power classification of the inverter is not the same as the power classification of the motor, the power of the inverter should be as close as possible to the power of the motor, but it should be slightly greater than the power of the motor.

3. When the old motor is frequently started and braked or is in heavy load starting and working frequently, a larger inverter can be selected to use the inverter for long-term and safe operation.

4. After testing, the actual power of the motor does have a surplus, and the inverter whose power is less than the power of the motor can be considered, but it is necessary to pay attention to whether the instantaneous peak current will cause overcurrent bridge bucket protection action.

5. When the power of the inverter and the motor are not the same, the setting of the energy-saving program must be adjusted accordingly to achieve a higher energy-saving effect. <>

Summary. Hello dear! There could be several reasons for this:

1.Motor or cable fault: Check whether the motor and cable are normal, whether there is damage or short circuit, etc.

2.Incorrect inverter parameter settings: Check whether the parameters of the inverter are set correctly, including motor parameters, output frequency, voltage and other parameters.

3.Insufficient motor torque: Check whether the torque of the motor is sufficient, if the motor torque is insufficient, you may need to replace the motor with higher power.

4.Inverter failure: Check the inverter for faults, such as damaged circuit boards, damaged capacitors, etc.

5.Power supply problems: Check whether the power supply is normal, including whether the voltage is stable and whether the power supply line is normal.

Hello dear! There are several reasons why it can be sent to be buried:1

Motor or cable fault: Check whether the motor and cable are normal, whether there is damage or short circuit, etc. 2.

Incorrect inverter parameter settings: Check whether the parameters of the inverter are set correctly, including motor parameters, output frequency, voltage and other parameters. 3.

Insufficient motor torque: Check whether the torque of the motor is sufficient, if the torque of the motor is insufficient, it may be necessary to replace the motor with higher power. 4.

Inverter failure: Check whether the inverter is faulty, such as damaged circuit boards, damaged capacitors, etc. 5.

Power supply problems: Check whether the power supply is normal, including whether the voltage is stable and whether the power supply line is normal.

The low frequency of the inverter is 1-5 turns, and the motor can not be moved more than 6 You can rotate It just started to run normally After a while, the self-sliding ruler stopped moving the frequency and it was good This kind of predicament is now a letter or image.

Dear, you try the above possible problems.

It is recommended to check the above problems, if it cannot be solved, it is recommended to contact professional maintenance personnel for inspection and repair.

Generally speaking, this phenomenon is due to the above reasons, you should check it first to see which problem it is.

There is electricity in the incoming line of the inverter, there is a display, there is no electricity in the output, and the setting is also correct, what's going on.

Dear, hello, I am glad to answer for you: the incoming line of the inverter has electricity, there is a display, the output is not electric, the setting is also right, what is going on Answer: There are many reasons why the inverter has no output voltage. The main ones are as follows:

Inverter failure Incorrect inverter parameter setting Inverter given value exceeds the allowable range Motor failure, causing inverter alarm and stop output Motor overload, causing inverter alarm and stop output Power cable disconnection Short circuit, causing inverter alarm and stop output This is the inverter voltage is normal but not output.

1. There are many reasons why the inverter has no output voltage There are many reasons why the inverter does not have an output voltage. The main ones are as follows: inverter failure; Incorrect parameter setting of the inverter; The given value of the inverter exceeds the allowable range of the bank; Motor failure, causing the inverter to alarm and stop output; The motor is overloaded, causing the inverter to alarm and stop the output. The power cable is broken and short-circuited, causing the inverter to report a clear lead alarm and stop output.

This is due to the fault detection circuit and the drive circuit causing the OC fault to be reported.

There are three reasons for this:1. Three-phase output current detection circuit. When the internal circuit of the current transformer is damaged, so that the output pin of the fault signal output is abnormally high voltage signal, the CPU thinks that the operating current is so large that it has reached the level of short circuit, so hurry up and report the OC signal;

2. The driver IC is damaged, such as the 6-pin INFET tube of J316 is short-circuited, and the 6-pin voltage is pulled to the low level of the fault detection state, if the CPU does not report the OC signal, it is not the CPU;

3. Although the driver IC is not damaged, the abnormality of the driving finger driving circuit leads to the abnormal working state of the module, and the OC signal is reported by the driving circuit at this time, which is not only not a false alarm, but also very timely and commendable. The power supply of the driver IC is usually in the form of positive and negative power supplies, and the positive voltage provides the excitation current of the IGBT on. The negative voltage assists the cut-off of the IGBB tube, forcing the charge of the IGBT junction capacitor to be pulled, making it more reliable and fast to cut off.

Workaround:1. Check whether the power supply is normal.

2. Check whether the parameters set are correct.

3. Check whether a given signal is added.