The Official Variable Frequency Drive (VFD) Distributing Blog

One of the more common problems seen in our Variable Frequency Drive (VFD) repair division is the failure of the IGBT (Insulated Gate Bi-polar Transistor) power section modules. 
If the Variable Frequency Drive (VFD) is blowing fuses, or the VFD simply is not turning on, the following test may aid you in finding the root of the problem.
A digital voltmeter test can tell if a [...]

Engineering technicians have many nightmare stories when it comes to on-site troubleshooting.  In this instance, I was called to help troubleshoot a Closed Loop (Sensorless Vector) Variable Frequency Drive (VFD) on a production line that was so large, it seemed to go so far down the plant, it never ended. 
After overcoming the intimidation associated with the sheer size of the line, it became a question of [...]