Okay finally tried to install controller and it is not working. Hoping it may be how I have it connected and not a bad controller. Shaker still shakes but contoller does not reduce the amount of shake at all no matter where the control knob is.
I have grey shaker wire that connects to brown/white machine power connected to - 'in' on controller and red wire connected to red/white machine wire to + 'in' on controller. I have black wire from shaker going to - 'out' on contoller and red wire from shaker to + 'out' on controller. Am I doing something wrong here?