Why not contact VPI with that question!
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I'll plan to measure this for you tomorrow after work.
Meanwhile try very briefly plugging the motor directly into 120VAC raw line; if it runs that way, or doesn't, then you know your answer.
Are you measuring the SDS output voltage into an open circuit, or connected to the motor? Try measuring it with no load; the motor, if defective, could be loading down the SDS output.