Well, I'm going to be different and say that you probably have the plug in the wall socket upside down, or that the transmognifier reset switch has been reset in the wrong polarity.......
I'd too bet it is the drive belt, seen it before, causes exactly what you are describing.
If you look here <link
You will find your planer at the Delta service center site.
The part is 22-563 - DRIVE BELT
Price is $18.30
Hope that is all it is.
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward