Near Intersection of I-35 & I-90 Southern Mn. | If your pump runs full speed or off then a relay would be fine. However in this situation, the controller will be sending out a PWM signal which turns ON/OFF very rapidly to in effect change the average voltage that the pump motor gets. This is often 100 HZ or 100 times/second. A relay is not designed to do that. The EMD that he refers to is designed for that purpose. They are not terribly expensive.
https://micro-trak.com/product/electric-motor-driver/
Edited by tedbear 1/30/2021 14:49
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Field IQ to run electric fertilizer pump
