We have one of the attached Copley DC Servo Amplifiers. It is not functioning and we need to find a replacement. Anyone can suggest a proper replacement?
It drives a DC motor (90-110V DC and 20A). Motor turns back and forth from a "H" power bridge using a triangle shape current when up and down buttons pressed. Feedbacks are motor speed taco signal and a sample signal from motor current (across a 0.05 ohm 25W resistor, yellow aluminium casing) plus an adjusting potentiometer for setting initial speed.