Replacement transformer

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SomeoneSomewhere

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#2801910 27-Oct-2021 11:53

The motor doesn't run off the transformer, but the control board powers the relays that turn the fan on. The fan won't work without that transformer.

Technofreak

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#2801932 27-Oct-2021 12:33

I think what @DonH was getting at but didn't explicitly say was a 240v to 24v transformer is the same ratio as a 120v to 12v transformer so will do the same job as the 120v to 12v transformer. 50Hz or 60 Hz is irrelevant. The old transformer might be marked 60 Hz but it's being used at 50 Hz now anyway. The only issue you have to think about is the transformers power rating.

Hopefully the fuse is a simple easy fix for you.

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DonH

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#2802077 27-Oct-2021 16:13

My apologies, I should have taken the time to explain better.

Being pedantic, the 50 Hz vs 60 Hz difference can also matter. The higher the frequency, the less iron is needed to carry the magnetic flux. That's why modern switch-mode power supplies are so light and have such small transformers - they convert the 50/60 Hz AC into 20 or 30 KHz AC before passing through the transformer. So a marginally rated 60 Hz transformer can overheat when fed the same voltage but at 50 Hz. I only know of one device that had that issue, an IBM dot-matrix printer.

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gregmcc

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#2802100 27-Oct-2021 16:53

Nate001:

DonH:

If you're set on replacing the transformer, look at 240 volt to 24 volt transformers.

That will only fix the PCB/Control of the unit. The schematic shows the motor does not use the transformer so won't be happy with 240V 50Hz vs 120V 60Hz.

For simplicity I would replace with a 240V rangehood if possible, seems troublesome having extra complexity.

Maybe the fuse has blown because of old age, or there could some other fault?

If you use a 240/24 transformer and put 120V in it you will get 12V out...... it's all a proportional thing

hsvhel

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#2806351 2-Nov-2021 18:55

DonH:

My apologies, I should have taken the time to explain better.

Being pedantic, the 50 Hz vs 60 Hz difference can also matter. The higher the frequency, the less iron is needed to carry the magnetic flux. That's why modern switch-mode power supplies are so light and have such small transformers - they convert the 50/60 Hz AC into 20 or 30 KHz AC before passing through the transformer. So a marginally rated 60 Hz transformer can overheat when fed the same voltage but at 50 Hz. I only know of one device that had that issue, an IBM dot-matrix printer.

How recent was that printer?

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DonH

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#2806560 3-Nov-2021 09:22

hsvhel:

How recent was that printer?

Not very. The clue was "Dot matrix". 😄

IBM Proprinter, late 90s.

People hear what they see. - Doris Day

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