I installed a CMC PM Field Servo motor with gearbox on my milling machine knee. I needed it to work with a automatic tool changer to give clearance for long reamers and drills. I am not sure if a PM Field Servo requires a special kind of amplifier? My other amps are AMC Brush Type PWM Servo Amplifier, 25A20. Will this type of amp work or do I need another type?