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Can someone help me with the schematic drawing. I want to use only contactors,relays and timers for this project.Shall appreciate this effort.Thanks
And got the following answer:
You haven't given enough information. Transfer between what, and on what event? Because you talk of contactors, I can only guess you mean transfer to a generator when the power fails. This is often called an auto start standby system. You need some kind of detector that the power has failed. This may be a simple relay on each phase, but often includes over and undervoltage, maybe frequency, phase rotation, and a test button. Combine all the outputs to get one output. This is an OR function. Relay contacts in parallel to operate a "mains-failure" relay. It latches to itself, and can be reset by "end of run" relay. The failure relay starts a timer for minimum run length, and sends a signal to the auto start controller. It releases the mains supply contactor to trap a short interruption which can play havoc with computers etc. Auto start controller The link below shows you can buy these off the shelf. May be worth looking at. The wiring link below shows how this would interface with your system, which also helps understand how to do it. These usually have microprocessors in them rather than a bunch of relays. This starts the generator, and monitors it during operation. Typical operation Start a timer for the starter motor. Generator sets often have the basic sensors on the engine already. Oil pressure, overtemperature, overspeed, running speed. The starter is disconnected once the engine gets to runup speed switch, or when the starter motor timer runs out. It could wait a bit and recycle three times or something like that if nothing happens. Once it gets to runup speed another timer starts. This provides a delay for the full speed, oil pressure, generator output to build up. Then it switches the status to run mode, as long as generator output, oil pressure, speed, temperature, maybe frequency are ok. Changeover switch Now the changeover switch can be operated. There must be electrical interlocks so that the two contactors cannot operate together. Most also have mechanical interlocks so only one contactor can be operated at a time, but both can be released at once. This means that the switch over function is a Break Before Make changeover, albeit with two contactors. There could be a timer so that one releases, then the time interval, then the other operates, to give a guaranteed minimum break time for those computer based appliances. This works in both directions, mains to generator and generator to mains. Mains restored The power fail sensors indicate that the mains is restored. Yet another timer, wait a few seconds to make sure the mains is back really and truly. Now if the minimum run timer has run down, the mains can be restored. Once restored the generator can be stopped. I had a look for circuits on the net. I think the chances are small for this. However if you draw all the above out I think you will soon see what relays you need. You need a battery power supply that it all runs off too. This is a process that is perfect for a PLC or microprocessor based control system.