Timeismoney08
Member
I need to break the connection to 6 motors, all fed from the same 480V 3 phase, from the same fuses.
When an E-stop is pressed, I need to break the power going to each motor.
With two contactors, and a safety relay, I would typically run the power through the two new contactors and then only pull them in when the safety relay is safe. On the reset, I would monitor the NC on both of these contactors to make sure they do not get welded shut and make it control reliable...
The question I have is this.... If one of the contactors were to get welded shut, wouldn't it just weld both of them? I would assume so because the same current that welded it on one would weld the other...
How do I better this design?
Thank you!
When an E-stop is pressed, I need to break the power going to each motor.
With two contactors, and a safety relay, I would typically run the power through the two new contactors and then only pull them in when the safety relay is safe. On the reset, I would monitor the NC on both of these contactors to make sure they do not get welded shut and make it control reliable...
The question I have is this.... If one of the contactors were to get welded shut, wouldn't it just weld both of them? I would assume so because the same current that welded it on one would weld the other...
How do I better this design?
Thank you!