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Why are the valve motor drive (VMD) outputs limited to 120V AC operation?

April 26, 2017AC drive limited motor operation outputs valve vmd

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Why are the valve motor drive (VMD) outputs limited to 120V AC operation?

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If the valve motor is driven directly by the controller output relays, the controller outputs are limited to half the voltage of their nominal rating. This restriction does not apply if the motor is driven via external contactors/relays, but those contactors/relays must themselves be rated at tw …