Ok, I just tested 2 motors with 3 different controllers with no load. I just happen to have the controller you were asking about, the Baldor version of the controller I linked to earlier in this thread, and the Penn State controller. The motors I tested them with are the Penn State 1/2 hp and an EI 1/3 hp Industrial motor. I adjusted the maximum voltage on the trim pot on each controller to as close to 90V as possible.
Results:
Motor KBWM-120/90.01V KBMD-240D/90.00V PennState/89.35V
Penn State 3.53A 4.17A 3.79A
EI Industrial 2.78A 2.78A 2.78A
So after this I bumped up the trim pot on the KBWM-120 and the Penn State controller to their maximum voltage possible and retested with the Penn State motor.
Motor KBWM-120/93.1V PennState/91.8V
Penn State 3.65A 3.80A
What this means is that the KBWM is not suitable for a 1/2 hp motor but either is the Penn State unit that ships with one. 93.1V x 3.65A = 339.8W or .454 hp for the KBWM-120 and 91.8V x 3.80A = 348.8W or .466 hp for the Penn State. My measurements indicate that the Penn State is a true 1/2 hp motor when hooked up to a suitable controller as 90V x 4.17A = 375.3W or .502 hp was measured using the KBMD-240D.
Here is a really bad cell phone pic showing the controllers and motors:
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