I'm having a problem with my KBMD DC motor controller. When no motor is connected, it puts out 0-90V, depending on the speed dial. However, when I attach my 1/40hp 90V DC motor, the voltage drops to zero and the motor won't move at all. I tested the motor and it's working fine. Any ideas as to why this is happening?
As per Kevin's recommendation, I adjusted the CL trimpot until the LED turned off. The voltage was still zero when the motor was attached, and it did not run. I hooked up an identical motor that was allowed to spin freely, but it too did not work. Interestingly enough, the ammeter pulled a current of 6A when attached in series to the controller and motor, but the motors are rated at .36A. However, I attached each to an 18V drill battery, and they seemed to operate correctly with no bindings or stalling. I used an identical motor controller for a few months before it went out, so I think they should be compatible. Any suggestions?