ABB frequency converter maintenance method

The repair method of ABB frequency converter needs to be properly grasped. The frequency converter is composed of various components, among which the performance of some components gradually decreases after long-term work and aging is the main cause of failure. In order to ensure the long-term normal operation of the equipment, capacitor, cooling fan and other vulnerable parts must be replaced regularly.

ABB frequency converter maintenance method

ABB inverter to repair ACS300 fault.

ACS300 frequency converter often damages the switching power supply. The switching power supply of frequency converter adopts the LT1244 waveform generator integrated block with similar function to UC3844. Due to the sudden change of working voltage and load damage of the switching power supply, the integrated block is damaged when it is used for a long time. The electrolytic capacitor has reached its service life, and the filter capacitor is also the direct cause of the damage of the switching power supply. The ACS300 converter rectifier bridge is often damaged during maintenance. Due to the selection of International Rectifier Company's most compact three-phase bridge rectifier, small volume and load current, poor heat dissipation performance, damaged after a period of use. The probability of ACS300 motherboard failure is also quite high, the communication failure between the control board and the motherboard, the motherboard CPU failure occurs, repair such a fault is very difficult. ACS300 adopts Mitsubishi IPM module, relatively low probability of failure, module damage, can only be replaced, but before replacement must ensure that the drive circuit is completely normal.

ABB frequency converter maintenance -ACS500 failed.

The common failure of ACS500 inverter is the damage of the driving film. The driving film includes driving circuit, short circuit detection, IGBT module detection, overcurrent detection and so on, which has good protection function. ACS500 high power module is rarely damaged. The driving film is damaged during maintenance. If there is no attachment, only the film can be repaired. The film parts are welded on the ceramic sheet, and the heat dissipation is quite fast. Special attention should be paid to not heating the soldering iron for a long time, which may damage the parts. Limited by the use of time, ACS500 heat dissipation fan will also fail, the common phenomenon is that after power-on only hear the buzz sound, but the fan will not rotate, the fan coil and bearing of the axial flow fan are good in most cases, usually the deflection capacitor fault, after replacement can be restored to normal.

ABB Frequency converter maintenance -ACS600 fault.

The performance and quality of the ACS600 converter are relatively stable. However, due to the influence of the surrounding environment, improper parameter setting and improper operation may damage the converter. Of course, natural damage is inevitable for every electrical product. Different from other series of products, ACS600 frequency converter adopts optical fiber communication, which greatly improves the communication time between CPU board and I/O board. However, it may also cause the fault of "LINKORHWC" PPCLINK ", which is largely related to the damage of optical fiber. "PPCLINK failure is a common failure of ACS600 frequency converters. Damage to the CPU board and I/O board may cause failure. ACS600 frequency converter will also damage the switching power supply, the fault mainly occurs on the switch tube, the short circuit of the switch tube will burn out the current limiting resistance. The ACS600 uses smart modules. Load failures and problems in use may damage the modules.

ABB frequency converter maintenance routine check.

Before powering on the inverter, check the ambient temperature and humidity. Too high temperature will cause overheating alarm of frequency converter, which will directly damage the power components of frequency converter. Too wet air leading to circuit short circuit will lead to direct short circuit inside the frequency converter. Attention should be paid to whether the cooling system is normal when the frequency converter is running.

Maintenance of ABB frequency converters is regular.

Clean the air filter to cool the air duct and dust inside. Check screws, bolts, plug-ins, etc., and whether there is short circuit in the ground and phase resistance of the input and output reactors, usually more than tens of megohm. Conductors and insulators must be wiped with alcohol immediately if they are corroded. If conditions permit, use oscilloscope to measure the stability of switching power supply output circuit voltage, such as 5V, 12V, 15V, 24V and other voltages. Whether the method of measuring the waveforms of the driving circuit is abnormal. Whether the waveform between UVW is sine wave, whether the contact point of contactor has ignition trace, if damaged, it must be replaced with the same model or a new product with larger capacity.