Lesson Category: AC GPU

Test over and under frequency and voltage protections

This lesson consist of a video that will show you how to test the over / under frequency and voltage protections on a Hobart 90CU24 ground power unit. Take the quiz after you have watched the video to test your knowledge.

Troubleshooting of AC Power Units

WELCOME In this lesson we will cover the basic electrical troubleshooting steps for AC ground power units (GPU), systems included are:  Engine starting system Engine acceleration system (electrical) Voltage build-up and adjustment  Output contactor operation In the next lesson, we will cover the same systems but on DC GPUs.