I've got a motor controller for a Bldc and I'm in the process of tuning the controller with both PWM frequency, duty cycle and commutation frequency.

Anyway, this power supply is a 30v 10A supply and when I drive the motor, the voltage and current limits kick in.  I start at 12V and allow 10A, but the supply sags to 9.5V @ 3.5A.  Then, when I shut the motor inverter off, and disconnect the supply, the power supply voltage indicator climbs up to 50V!  I have to short out the terminals to get it back under control.

So, two questions :

Why doesn't my supply current limit at 10A like its supposed to? If I short the terminals, I can get 10A, but the motor won't pull 10A.

And, why does the voltage climb after being disconnected?

**Edit**:
Well, it seems like it's something more serious that this... The power supply is very laggy when changing voltages, the voltage is unable to go below 2.5V, and it ramps up and down when it is initially turned on.... This was after leaving it sit for over an hour and then turning it on, open circuit.

I think she's spent.