New start

[Nr1madman]

New day and new questions :D

I fused my 24v psu with a 2A fuse.
But now that I think about it.. must be wrong?
The psu is 24v / 2A but thats on the secondary side.
Input is 50w so fuse should be around 0.25A.. correct?

My toroid is 500VA so without inrushcurrent 2.2A fuse should be enough? I fused 2.3A but that kept blowing every 5-7times I powered up. Exchanged for a 3A and now it seems okey but is it still protected?

I'm wanting to exchange to MCB type of fuses. Now I have 5x20 glassfuses. Not really easy to find MCB with these kind of ratings :)

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[Doddy]

New day and new questions :D

I fused my 24v psu with a 2A fuse.
But now that I think about it.. must be wrong?
The psu is 24v / 2A but thats on the secondary side.
Input is 50w so fuse should be around 0.25A.. correct?

My toroid is 500VA so without inrushcurrent 2.2A fuse should be enough? I fused 2.3A but that kept blowing every 5-7times I powered up. Exchanged for a 3A and now it seems okey but is it still protected?

I'm wanting to exchange to MCB type of fuses. Now I have 5x20 glassfuses. Not really easy to find MCB with these kind of ratings :)

Skickat från min SM-G955F via Tapatalk

Re. 24V PSU - you're broadly correct - though personally I'd give it a little more headroom (rough rule-of-thumb is 125%) - probably 300mA, and with a power-supply then use an anti-surge or time-delay fuse.

For the toroidal transformer an anti-surge is a must, though I'd* even go as far as installing a NTC thermistor in series with the primary coil to limit the inrush current.

* wrong tense : I'm building up a PSU now for my next machine - NTC thermistors on order, SSRs on order - in the mistaken belief that zero-crossing would be a good thing - but a little googling reveals the role of the NTCs.

[Nr1madman]

For the toroidal transformer an anti-surge is a must, though I'd* even go as far as installing a NTC thermistor in series with the primary coil to limit the inrush current.

I was under the impression that I could get away with 500va without anti surge but 600va and larger was more of a problem?

Can confirm that my entire shed blinks and hum for a sec when I power the toroid :D

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[Desertboy]

I was under the impression that I could get away with 500va without anti surge but 600va and larger was more of a problem?

Can confirm that my entire shed blinks and hum for a sec when I power the toroid :D

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I have NTC on my transformer was a bitch to get the right one. I have no issues running it without NTC (Doesn't trip anything) but the real advantage for me is I can use a MCB type a if you use NTC for extra protection, remember I blew a transformer up already lol.

We're 99% certain we plugged the bridge rectifier in back to front during testing but you're not using one are you?

I have a 1kva transformer 45v output (70v when rectified)