The Company's Main Products Include Medium And Low Voltage Inverters, Soft Starters, Control Cabinets (including Plc Cabinets And Frequency Conversion Cabinets, Etc.) Complete Sets, Integration And Special Machines, Servo Systems, Plc, Hmi, Etc.

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ABB inverter repair

ABB inverter repair

For ACS300 inverters, the most frequently encountered fault is the damage of the switching power supply. The ACS300 inverter switching power supply uses a waveform generator integrated block called LT1244 that is similar to the UC3844 function. It is subject to sudden changes in the operating voltage and the switching power supply. The damage of the load causes the damage of this integrated block to occur from time to time. Due to the long use of the electrolytic capacitor, the electrolytic capacitor has reached its end of life, and the capacitor used for filtering has become the direct cause of the damage of the switching power supply.
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ABB frequency converter fault repair and countermeasures

1. Common faults of ACS300 inverter

For ACS300 inverters, the most frequently encountered fault is the damage of the switching power supply. The ACS300 inverter switching power supply uses a waveform generator integrated block called LT1244 that is similar to the UC3844 function. It is subject to sudden changes in the operating voltage and the switching power supply. The damage of the load causes the damage of this integrated block to occur from time to time. Due to the use of a long time, the electrolytic capacitor has reached its service life, and the capacitor used for filtering has become the direct cause of the damage of the switching power supply. During maintenance, the rectifier bridge of the ACS300 inverter is often damaged. Perhaps they chose one of the most compact three-phase full-bridge rectifiers from International Rectifier Company from an economic point of view. The volume and load current are both small and heat dissipation. It is also poor, so it will be damaged after a period of use. The probability of failure of the ACS300 main control board is also quite high. Communication failures between the control panel and the main board, and main board CPU failures all occur from time to time. Usually such failures are difficult to eliminate. ACS300 uses Mitsubishi's IPM module. Relatively speaking, the probability of failure is relatively low. The module is damaged and can only be replaced, but the drive circuit must be completely normal before replacement.

2. Common faults of ACS500 inverter

For the common faults of ACS500 inverter, the drive thick film is damaged. This drive thick film already includes not only the drive circuit, but also short circuit detection, IGBT module detection, overcurrent detection, etc. Due to the good protection function, the large The power module is rarely damaged. If the thick film of the driver is damaged during maintenance, we can only repair the thick film without accessories. Because the thick film components are soldered to the ceramic sheet, the heat dissipation is quite fast. Pay special attention not to use the soldering iron for a long time. Heating on the components, causing damage to the components. Due to the limited use time, the cooling fan of ACS500 will also fail. A common phenomenon is that only a "buzzing" sound is heard after power-on, but the fan does not rotate. Because it is an axial fan, the fan coils and bearings are often normal. Yes, after inspection, it was found that the deflection capacitor was faulty, and it returned to normal after replacement.

3. Common faults of ACS600 inverter

For the ACS600 inverter, it should be said that the performance and quality are quite reliable, but due to the influence of the surrounding environment, improper parameter setting, and improper operation, it may cause damage to the inverter. Of course, the natural damage is also each brand. The inevitable factor of frequency converter. Different from the previous ABB inverters, the ACS600 inverter uses optical fiber communication, which greatly improves the communication time between the CPU board and the I/O board, but it may also cause faults such as "LINK OR HWC" and "PPCC LINK". , The occurrence of this kind of failure and the damage of the optical fiber are not absolute. "PPCC LINK" fault is a common fault of ACS600 inverter. Damage to the CPU board and I/O board may cause this fault. If the switching power supply is damaged, it will also be encountered in the ACS600 inverter. The fault mainly occurs on the switching tube. Due to the short circuit of the switching tube, a power resistor used for current limiting will often burn out. The "SHORT CIRCUIT" output short-circuit fault is the most common type of fault we have encountered. ACS600 uses an intelligent module. Load failures and some problems in use can cause damage to the module, and the module is often damaged. With the damage of the drive board, the cost of repairing the frequency converter is relatively high because the spare parts are more expensive, so higher requirements are put forward for the board-level maintenance of the maintenance personnel.

4. Common faults of ACS800 inverter

DC UNDERVOLT (DC bus undervoltage fault)

The cause of the fault: The DC voltage of the DC circuit is insufficient, which may be caused by the lack of phase of the power grid, the blown fuse or the internal fault of the rectifier bridge. Solution: (1) Check whether the main power supply is normal. If the inverter's incoming line passes through the contactor, check whether the control circuit of the contactor is malfunctioning. If the control circuit malfunctions, it may cause the contactor in a short time. Frequent start and stop will cause the inverter under-voltage fault, and reset is good. Therefore, the main contactor control circuit of the inverter should be carefully checked for the under-voltage soft fault that can be reset. (2) If there is an undervoltage fault that cannot be reset, check whether the DC capacitor is leaking. (3) If the inverter has just been powered off and quickly turned on, this fault will also occur. Therefore, if the inverter is powered off, wait for the capacitor to discharge (about 5 minutes) before restarting the inverter.

0VERCURRENT (Excessive output current)

The cause of the fault: the output current exceeds the overcurrent trip limit of the software. Solution: (1) Check whether the motor load is short-circuited. (2) Check whether the mechanical transmission device is stuck. (3) Check whether the parameter settings are appropriate, including whether the time for speed-up and speed-down is set too short, and whether the starting torque is too small. (4). If an encoder is used, check whether the data transmitted by the encoder is accurate (you can remove the encoder from the parameters and run it again to check whether the current is normal).

5. Regular maintenance
Clean the air filter cooling duct and internal dust. Check whether the screws, bolts, plug-ins, etc. are loose, and whether the resistance of the input and output reactors to ground and phase to phase is short-circuited. Normally, it should be greater than tens of megohms. Whether the conductors and insulators are corroded, if any, wipe them clean with alcohol in time.

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