Electronics > Repair

Invertor 48V /220V

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Jane:
The invertor has  2 air fans that start only  when quite a high electricity consumption is needed . Otherwise the fans are  quiet. It worked that way for about 2 years. Now,however, the  fans work all the time.

On the enclosed pictures you can  see   a   region   where fans are connected. It seems quite simple. Anyone knows the principle , how the  fans are controlled?
Thank you

Kwakerman:
Looks like you have a temperature sensor attached to the heatsink (first picture top heatsink).  Might be for overtenp protection or fan control (or both).  Suggest you try and find a circuit drag for it.

Jane:
Thank you for the reply.
Can you please mark in the picture where do you think there is the sensor?

voltsandjolts:
It's here:

johansen:
the traces on the board run all the way to it.

looks like the fans get power from a rectifier and aux turns on the transformer.

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