Before the first power on detection of temperature and humidity of the surrounding environment, too high temperature will cause the inverter overheat alarm, which will directly lead to damage, the inverter power devices short circuit; air is too humid will lead to drive internal short circuit in the inverter operation should pay attention to the cooling system is normal. ABB frequency converter maintenance - regular maintenance, cleaning air filter, cooling air duct and interior dust. Check whether the screws, bolts and plug are loose, the input and output reactor ground and interphase resistance is short circuit, the normal should be more than tens of megabytes of europe. Are there any corrosion of conductors and insulators? If necessary, wipe them immediately with alcohol.

Under the conditions permit, use oscilloscope to measure switching power supply output circuit voltage stability, such as: 5V, 12V, 15V, 24V and other voltage. Is there any distortion in the method of measuring the waveform of the driver circuit?. Whether the waveform of the UVW phase is sine wave or not, whether the contactor has a spark mark or not, should be replaced with new products of the same type or larger than the original capacity.