Functional test cabinets for inverter end-of-line (EOL) testing

The project

At the request of a test system manufacturer, we supported the realization of an inverter end-of-line (EOL) testing station. In this project, the functional test cabinets were supplied by AUTFORCE. These contain the intelligence and control of the test sequences as well as the measurement and control electronics.
At the end of assembly, the inverter is tested for functionality. This involves carrying out an insulation test, applying load to the inverter’s power stage, and testing the communication interfaces. AUTFORCE develops and designs customised functional test cabinets for this purpose. We support our customers in the project initiation phase and can react flexibly to changes during the project.

Keyfacts

• 3-phase and 6-phase inverters
• Robust passive load (L-load) for production
• Emulation and simulation of rotor position sensors
• Safety-related voltage monitoring and discharge

Realization

As part of the project, we worked with our customer to design a test cabinet that meets the requirements of a well-known OEM. We opted for a compact test cabinet for this, as the available space in production is precious. The test concept was based on applying an inductive (passive) load to the inverter.
For tests with a so-called passive load, simple chokes are connected to the inverter. The focus here is on the correct functioning of the power module. Testing using a passive load requires lower investment compared to an active load and is therefore an interesting alternative.