Inverter problems, common faults of inverters

The principle of inverter (English variable-frequency drive, referred to as VFD) is a power control equipment that uses the principle of frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the working power supply of the motor. The power supply used is divided into AC power supply and DC power supply, and the general DC power supply is mostly obtained by AC power supply through transformer voltage transformation and rectification filtering. AC power accounts for about 95% of the total power supply used by people.

Overload protection. Please use a multimeter to measure the overload current of the water pump.

The pump should be dirty, resulting in an increase in overload current.

Please check the water pump, and if this is the problem, clean the lower pump for maintenance.

Then measure its overload current, if the current is still higher than the rated current, then you need to find a rewinding coil for motor repair.

The motor may have a stalled rotor phenomenon, check it, if it is not a motor problem, it is not ruled out that the software of the inverter is unstable. How long has the inverter been used, if it is in the protection, try to change the board.

If the inverter is P-type, hehe, maybe it is smaller.

It depends on how long your inverter has been used.

If you just used it. The words just used show that the frequency conversion selection is small.

It should be changed to a bigger one.

If it has been used for some time, the inverter may age quickly. It may also be that the motor is old and faster.

It should be overload protection anyway.

You use a multimeter to measure the overload current of the water pump.

Check the parameters of the alarm.

Give me points. Thank you.

The presence of this sign indicates that the drive is overloaded.

Check whether some pumps are clogged.

If not, increase the overload factor.

The problem with the inverter, there may be a problem with the board inside, send it back to the manufacturer to replace a new one.

Generally, it is ultra-negative, which can increase the power of the inverter.

Check the bearings again. Give it to the Northeast Automation, a man's face is very valuable!

Summary. 1. Inverter failure: 1) Power failure; 2) Capacitor failure; 3) IGBT failure; 4) Failure of internal components of the inverter; 5) Control module failure; 6) Programmer failure; 7) Running parameter error; 8) Abnormal speed regulation voltage; 9) The inverter current load is excessive; 10) Feedback system failure; 2. Inverter defects:

1) The capacitor withstand voltage is too low; 2) Failure of filter capacitors; 3) Abnormal IGBT temperature; 4) The internal circuit board of the inverter is aging; 5) The control module is abnormal; 6) Detect module abnormality; 7) Wrong programmer parameter setting; 8) Speed regulation voltage fluctuation; 9) Current short circuit; 10) Feedback is abnormal.

1. Inverter failure: 1) Power failure; 2) Capacitor failure; 3) IGBT failure; 4) Failure of internal components of the inverter; 5) Control module failure; 6) Programmer failure; 7) Running parameter error; 8) Abnormal speed regulation voltage; 9) The inverter current load is excessive; 10) Feedback system failure; 2. Inverter defects: 1) The capacitor withstand voltage is too low; 2) Failure of filter capacitors; 3) Abnormal IGBT temperature; 4) The internal circuit board of the inverter is aging; 5) The control module is abnormal; 6) Detect module abnormality; 7) Wrong programmer parameter setting; 8) Speed regulation voltage fluctuation; 9) Current short circuit; 10) Feedback is abnormal.

How to look at the production date of Mitsubishi inverter, there is no manual.

If there is no manual, you can go to Mitsubishi Electric or an authorized dealer to ask for the specific production date, or check the factory number. Generally, the first five digits of the Mitsubishi Electric inverter model number indicate the factory time, for example, the factory number of FR-S520S is FR-S523S-09BEThen 09 indicates the date of 2009 factory.

Can I see it on this one?

You can't see this one.

Summary. Cause of overcurrent fault: The starting acceleration time is too short; The inverter does not match the motor capacity; Ground fault.

Solution: Extend the acceleration time, design load distribution, and check the line. 2. Cause of undervoltage fault:

power supply phase loss; Multiple inverters are started at the same time; Disturbed by the outside world. Solution: Check that the power supply of the inverter is empty, reduce the number of inverters that start at the same time, and enhance the anti-interference ability of the inverter.

3. Cause of overheating failure: the ambient temperature is too high; Poor ventilation of the inverter; Stuck or damaged fans; The load is too heavy.

You're called, glad for you for this question.

Can you elaborate on that a little bit more?

Cause of overcurrent fault: The starting acceleration time is too short; The inverter does not match the motor capacity; Ground fault. Workaround:

Extend acceleration times, design load distribution, check lines. 2. Cause of undervoltage fault: power supply phase loss; Multiple inverters are started at the same time; Disturbed by the outside world.

Solution: Check that the power supply of the inverter is empty, reduce the number of inverters that start at the same time, and enhance the anti-interference ability of the inverter. 3. Cause of overheating failure:

The ambient temperature is too high; Poor ventilation of the inverter; Stuck or damaged fans; The load is too heavy.

The more common faults of the inverter: overcurrent, overvoltage, overload, overheating, undervoltage, etc

Overcurrent is divided into true overcurrent and false overcurrent; False overcurrent is caused by current sensing circuits such as sampling circuits, Hall elements, and amplification circuits. True overcurrent is caused by excessive load, short acceleration time, and damage to the inverter module.

Overvoltage and undervoltage are generally caused by damage to the detection circuit and module, short deceleration time, and high power frequency voltage.

1、"oc"Overcurrent alarm fault: This is the most common fault of the inverter, we first eliminate the fault caused by parameter problems, such as: current limit, acceleration time is too short may lead to overcurrent.

Then it is necessary to determine whether there is a problem with the current detection circuit, and if there is a current display on the panel when the motor is not connected, it is necessary to test whether there is a problem with its 3 Hall sensors.

2、"ov"Overvoltage faults: First of all, troubles caused by parameter problems, such as short deceleration times, and overvoltages due to regenerative loads, etc.

Then you can see if the voltage detection circuit is faulty. The voltage sampling point of the general voltage detection circuit is the intermediate DC bus sampling (DC of about 530V) through the resistance value of the resistance of the larger resistance after the voltage is lowered, and then isolated by the light lotus, when the voltage exceeds a certain value, the display of "5" overvoltage (this machine is a digital tube display) can see whether the resistance oxidation value, whether the light lotus has a short circuit.

3、"UV "undervoltage fault: first of all, you can see whether the voltage at the input terminal is low and the phase is missing, and then look at the voltage detection circuit to applaud and judge that the voltage is the same.

4、"oh "overheating fault: the temperature of the inverter is too high, check the ventilation of the inverter, and whether the axial fan is running well. Some inverters have a motor temperature detection device to check the heat dissipation of the motor, and then we check whether the components of the detection circuit are normal.

5、"sc"Short-circuit fault: You can detect whether there is a short-circuit phenomenon in the internal components of the inverter. With Yaskawa 616G545P5 as the column, whether there is a problem with the module, the driving circuit, and the optical lotus is generally a problem with the module and the driver.

Replace the module and repair the drive circuit. "sc" fault will be eliminated.

The first is overload fault, the overload fault may be too heavy, or the voltage load can not meet the corresponding voltage, so it will cause a certain load overload and debt, and the transformer will fail, so the best way to do this is to transform the converter with greater power and the motor can load more pressure electrical appliances. The second fault is overcurrent and overcurrent, the most likely is the input of the inverter, so that it has a short circuit, in this case, we need to carry out a large investigation of all the lines, and then weld the short-circuited lines and replace them with larger current lines. The third is undervoltage, undervoltage may be the means of power supply circuit problems, or serious overload of the line or a short circuit caused by a poor contact, in this case, we need to check the external and internal wires, if the voltage is low, must change the inverter.