Trainelectric
Member
There has to be something out there, I just don't know what terms to use to search for it.
I need to sense whether or not 240 volt 3 phase power is present.
Does anyone have recommendations, schematics, suggestions, old threads on how to sense whether or not voltage is present?
The situation is this: Passenger train. Three of the cars each have their own generator. Train gets plugged in at night . Each car with a generator can be powered by: the land line, it's own generator, or the generator of the car next to it. I would like to use a plc to sort out which source of power is the priority, whether or not to send power out to the rest of the train, whether it's own generator is running.
I was thinking about using a phase relays, but there are situations where it will not activate,which would result in the plc trying to put two sources together.
There is just voltage, not current, so I don't think a current sensor would work in this application.
The actual control is easy. I just need some suggestions on how to sense whether or not potential exists on the power inputs.
I currently use relay logic, but there are some drawbacks to this.
Thanks
Steve
I need to sense whether or not 240 volt 3 phase power is present.
Does anyone have recommendations, schematics, suggestions, old threads on how to sense whether or not voltage is present?
The situation is this: Passenger train. Three of the cars each have their own generator. Train gets plugged in at night . Each car with a generator can be powered by: the land line, it's own generator, or the generator of the car next to it. I would like to use a plc to sort out which source of power is the priority, whether or not to send power out to the rest of the train, whether it's own generator is running.
I was thinking about using a phase relays, but there are situations where it will not activate,which would result in the plc trying to put two sources together.
There is just voltage, not current, so I don't think a current sensor would work in this application.
The actual control is easy. I just need some suggestions on how to sense whether or not potential exists on the power inputs.
I currently use relay logic, but there are some drawbacks to this.
Thanks
Steve