Author Topic: Invertor 48V /220V  (Read 337 times)

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Offline JaneTopic starter

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Invertor 48V /220V
« on: July 12, 2024, 08:16:07 pm »
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
 

Offline Kwakerman

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Re: Invertor 48V /220V
« Reply #1 on: July 13, 2024, 10:00:36 am »
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.
 

Offline JaneTopic starter

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Re: Invertor 48V /220V
« Reply #2 on: July 13, 2024, 02:44:46 pm »
Thank you for the reply.
Can you please mark in the picture where do you think there is the sensor?
 

Offline voltsandjolts

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Re: Invertor 48V /220V
« Reply #3 on: July 13, 2024, 03:49:09 pm »
It's here:
 

Offline johansen

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Re: Invertor 48V /220V
« Reply #4 on: July 13, 2024, 06:29:51 pm »
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.
 

Offline Vovk_Z

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Re: Invertor 48V /220V
« Reply #5 on: Yesterday at 10:20:44 pm »
Yes, fans get power from a main transformer. The higher load the higher FAN voltage. But there possibly is BJT transistor which controls swit hing on and off of a FAN. And possibly it became shorted.
 

Online coromonadalix

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Re: Invertor 48V /220V
« Reply #6 on: Today at 08:09:49 am »
yep i would have said the same thing,  come from the main ac voltage then rectified as DC, a crude way to make them work ... and they are 2 wires only ...

the thermal sensor should be used in the main controller section
 


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