Colchester Triumph 2000 – Bridge Rectifier

[JuddyParticipant @juddy]

something like this would do it:

 

https://www.amazon.co.uk/Single-Phase-Diode-Bridge-Rectifier-Terminals/dp/B07DM4C6CG?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A2LZADUCQG7RBO

[danielcv]

On danielcv Said:

…So the behaviour matches a faulty rectifier …

Not possible to confirm that completely, but I agree it’s the best match to the symptoms and the circuit of a similar lathe.  I’d replace the item with a rectifier just as you intend and see what happens.

No harm in over-egging with a 35A rectifier.  There might be a resistor inside the unit, but the possibly wrong circuit shows it, and the capacitor, are both external.  I don’t see any sign of a capacitor in the photos but it might be fixed to the brake assembly.   It, or the brake solenoid coil, might be root cause.  Either failing by shorting out would trip the circuit breaker and might blow the rectifier too.

Anyway replace the rectifier and see what happens.  If all is well, hurrah.   If not we can think again.

Top marks for suggesting this was a rectifier problem at the outset.  Fair bet that’s right.  Replacing it would be my first move

My suggestion the item is a relay isn’t eliminated.  The brake circuit shows two, I’ve highlighted the most likely:

K2 (SPINDLE CONTROL) puts a switch into the rectifier feed, but it’s multipole, not two terminal.  Unlikely.

K1 (BRAKE RELEASE) is two terminal, and it’s switch parallels K1.   Could be.

I think both relays are interlocks, and the part being relay K1 is a possibility if the rectifier fix doesn’t work.

Cape Verde looks like paradise.  Obviously, a house call is needed!   Where are my water wings…

🙂

Dave

 

[danielcvParticipant @danielcv]

Hello again.
Wow, I am really glad of having so much really helpful and elaborated answers ! This forum is spectacular!
Thank you so much.
And yes Cape Verde islands are very beautiful and warm. I am running a site about the archipelago, for those who want to know more: https://www.capeverde.com

Best regards,
Daniel

[Author]

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