Boxford 280 T. electrical fault

May 01, 2021 1 Replies
T

I have converted this lathe with the help of members to run on 240v about 5 years ago and it?s run fine ever since but after using it all morning I switched it on this pm and blew the RCD .I now can?t use the start switch or 12v light to run it but by jamming the contactor in I can run it by means of the multi speed switch I fitted at conversion. I have tested the transformer, there is 240v input but no 12v or 110v output, before I invest in a new transformer is there any thing I may have not considered, is it not uncommon for a transfer to fail and are there any cheaper 250 v>110 >12v transformers out there than a Boxford one.

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replying to Tony Burdett, Houstonceng. wrote: Hi Tony. Not sure what you mean by "multi speed switch'' and, like another poster, why you have 110v. Notwithstanding, if the motor runs now with the contactor jammed on manually, it is likely that the motor is OK and the RCD popped because the contactor winding failed. Transforner's do fail, usually open circuit, and it is not often that the winding leaks to earth as it is well insulated from the core metal. All that being said, you need to test each part on the circuit using suitable test gear (AVO and Megger (old school) or one of the new e-lec-tronic multitesters.

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