The error output on 'Assign Data' workflow steps doesn't trap most errors

I'm using an 'Assign Data' step in the workflow and it's generating an error but it's not going down the red 'Error' path in the workflow, it just says "faulted".  I've found and corrected the source of the error but am wondering what errors the red 'Error' path will trap - does anyone know?  I have yet to produce an error that will actually use the Error path so I'm wondering what it's for.

Dear Jon Weston! It looks like the Community cannot answer your question. That's why we have opened a Support Request with the Number SR-166733-H6T8Q for you. A Software Support Specialist will contact you directly to follow up. We will update this thread with the solution as soon as we have resolved the Support Request. With best regards, DocuWare Support Team

Here's the resolution from DW Support: The workflow instance, when faulted, retries 5 times, and upon the 5th failure will move down the error path. The interval between attempts is set at a value of 2 minutes for Cloud systems, but for on-premise this value, along with the number of retries, can be changed in "C:\Program Files\DocuWare\Background Process Service\DocuWare.BackgroundProcessService.LongLiving.GenericProcess.exe.config"