Julianh
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Hi all,
Could anyone help me with a very simple circuit?
I have a large 240v ac fan, that needs to be switched on if a supply is detected at either of two sources. The large fan creates an air flow, dispersing the heat from the heater more evenly, it is also used to push the air the to the extractor fan, when either of them is switched on. If both are on, it also needs to run.
One source is a mains, 240v ac, heater, the other is an humidity controlled extractor fan. I thought the easiest way would be to use a couple of relays, with the coils linked to the sources. This works fine with the heater, but not with the extractor fan.
With the heater, I tapped into the mains supply to it, as it's on a timer / thermostatic switch. Easy.
With the extractor fan, I tapped into the supply of the fan itself, mains, but after the control circuit. It's an all in one device with built in humidity circuit. This doesn't work, i tested the fan's supply it's 240vac, but the relay buzzes when this switches off. So the control circuits output may be 240v ac, but it's not happy running the coil of the relay.
The diagram is below.
I need a simple circuit that detects a mains voltage on one of two inputs, and switches an isolated, separate, 240v ac, 1 amp supply.
Thanks for your help
Julian
Could anyone help me with a very simple circuit?
I have a large 240v ac fan, that needs to be switched on if a supply is detected at either of two sources. The large fan creates an air flow, dispersing the heat from the heater more evenly, it is also used to push the air the to the extractor fan, when either of them is switched on. If both are on, it also needs to run.
One source is a mains, 240v ac, heater, the other is an humidity controlled extractor fan. I thought the easiest way would be to use a couple of relays, with the coils linked to the sources. This works fine with the heater, but not with the extractor fan.
With the heater, I tapped into the mains supply to it, as it's on a timer / thermostatic switch. Easy.
With the extractor fan, I tapped into the supply of the fan itself, mains, but after the control circuit. It's an all in one device with built in humidity circuit. This doesn't work, i tested the fan's supply it's 240vac, but the relay buzzes when this switches off. So the control circuits output may be 240v ac, but it's not happy running the coil of the relay.
The diagram is below.
I need a simple circuit that detects a mains voltage on one of two inputs, and switches an isolated, separate, 240v ac, 1 amp supply.
Thanks for your help
Julian
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