I dont think there is a way without a controller of some sort. The wires are 24v+, negative, and pwm (speed control) signal.
The power supply is just converting AC to 24VDC.
I have one connected to an arduino giving a pwm signal for ramp up/down.
I just had my power supply replaced under warranty on one of my pumps. Showed up very fast. I think its a one year warranty.
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