What certificates are needed for installation, debugging and maintenance of elevator industry?

I work in elevators. I need to know computers and simple programs. I can play PLC in C language, such as electrician and field circuit diagram, frequency converter data, etc.

Maintenance is divided into on-site primary maintenance and standby maintenance, and you can go to work after issuing the operation certificate to the school examination run by the Technical Supervision Bureau. There are also intermediate senior technicians and senior technicians. These have basic individual exams, and those above intermediate level need to know electronic circuits, electricians, fitters, computers and so on. It is convenient for on-site personnel to maintain, allowing you to quickly find faults and solve them. Now elevators are all motherboards and frequency converters, and PLC is seldom used.

If installed, you can go directly to the construction site and ask the teacher to take it for 2 years, which is almost enough, such as preventing the model, stabilizing the host, installing the track, hanging the hall door and so on.

Debugging the debugging team in this industry, you have the opportunity to enter a big factory and have a degree. In fact, it is not difficult. It is difficult to get a few people, and fierce competition is needed. After studying in the factory 1 year, you can work alone. Debugging is mainly to adjust all the data. Now the elevators are almost adjusted before leaving the factory. One can be adjusted at one site, and the others can be adjusted quickly, all of which have data replication function.