Hello, how long is the maintenance training class of Guangzhou Keyu Inverter? Guangzhou Keyu Inverter Maintenance Training Course lasts for 20 days. In Guangzhou Keyu inverter maintenance training, the standard teaching time for explaining the technical arrangement of inverter, circuit board, PLC, servo driver and touch screen maintenance is 20 days, and the trainer will adjust the teaching time reasonably according to the students' acceptance and understanding ability.