Hello Everyone,
I have an SCR controlled 240v to 12v DC 100A or better power supply that was built by a very good friend that I have lost contact with unforunately some years ago.
The last time I used this, when under full load the power supply would jump on & off & on etc very rapidly along with the circuit breaker in the mains board, it was quite an issue at the time.
I found the problem to be an unsoldered loose tap on the secondary side of the transformer, it was making intermittant contact.
I have just now years later connected a smaller transformer 240v to 12v 50A to see if all the rest of the circuitry was working still.
There seems to be a problem, into a 0.55 ohm load the secondary output is only 4.5v & about 8A instead of being 12V & approx 22A.
I get 240v to the primary side of the transformer through the SCR control, I get 12v on the secondary side but only 4.5v DC output after the rectifier.
The Power supply has four SKN 100/08 diodes to rectify the output.
Is it possible that these may have been damaged with the problems above mentioned before?.
What is the correct test proceedure for these diodes so I can check them?.
Could this cause the lower output if they were infact damaged?
Thank You.
I have an SCR controlled 240v to 12v DC 100A or better power supply that was built by a very good friend that I have lost contact with unforunately some years ago.
The last time I used this, when under full load the power supply would jump on & off & on etc very rapidly along with the circuit breaker in the mains board, it was quite an issue at the time.
I found the problem to be an unsoldered loose tap on the secondary side of the transformer, it was making intermittant contact.
I have just now years later connected a smaller transformer 240v to 12v 50A to see if all the rest of the circuitry was working still.
There seems to be a problem, into a 0.55 ohm load the secondary output is only 4.5v & about 8A instead of being 12V & approx 22A.
I get 240v to the primary side of the transformer through the SCR control, I get 12v on the secondary side but only 4.5v DC output after the rectifier.
The Power supply has four SKN 100/08 diodes to rectify the output.
Is it possible that these may have been damaged with the problems above mentioned before?.
What is the correct test proceedure for these diodes so I can check them?.
Could this cause the lower output if they were infact damaged?
Thank You.
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