Electrical issues you say? Plenty of support here. The VFD looks like an add on since original manufacturing. The original (from your comments, still installed), electrical system was a conventional 3 phase, contactor, likely with low voltage (120v) controls. That is a very common set up on industrial machines. A conversion to VFD power can be done a few ways (ie. the right way and the wrong way). The VFD needs to be wired directly to the motor, and the VFD provides the motor control - the original switch gear is not used. You can then run the motor directly from the VFD panel. That works, but it is much cooler to repurpose the original panel switches to the control input of the VFD, add a potentiometer to your machine switch panel, and put the VFD in a protect cabinet out of the way - looks great, works great. The other approach (wrong one) is to run the VFD to generate the 3 phase power and feed the existing electrical supply and run off the machine’s standard electrics which is likely to destroy something, probably the VFD.
It sounds like your machine has been given a VFD conversion, they were correct in bypassing the factory original electrical controls, but they didn’t go through the effort to package it up all pretty. Many folks here have done the full conversion (I have on two machines), hopefully you can sort through the VFD manual. The first conversion I did involved going through the manual about 50 times (there are a lot of features), and numerous temporary set ups scabbed together. Even looked at some other VFD manuals, often different drives will have similar features, but differ in how to program them. Post more pictures, ask lots of questions.