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The Water Cooler
General Discussion
Electricians or people that understand wiring, test me
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<blockquote data-quote="dennishoddy" data-source="post: 3291044" data-attributes="member: 5412"><p>Yes, there are several possibilities. My example would be for the VFD to drive a conveyor at a controlled speed to meter the material on the conveyor, while the controller in charge of the entire system may have a safety built in to prevent a jam or stall by opening the isolating contactor and closing the bypass contactor with phases reversed to provide an automatic reversal of the conveyor belt. The controller in charge would have a timer that would only back up the conveyor belt for a pre-determined length of time then open both the isolation contactor and the main contactor to shut everything down, waiting on an operator reset.</p></blockquote><p></p>
[QUOTE="dennishoddy, post: 3291044, member: 5412"] Yes, there are several possibilities. My example would be for the VFD to drive a conveyor at a controlled speed to meter the material on the conveyor, while the controller in charge of the entire system may have a safety built in to prevent a jam or stall by opening the isolating contactor and closing the bypass contactor with phases reversed to provide an automatic reversal of the conveyor belt. The controller in charge would have a timer that would only back up the conveyor belt for a pre-determined length of time then open both the isolation contactor and the main contactor to shut everything down, waiting on an operator reset. [/QUOTE]
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