The Craftmans Shop > New from Old
Resurrection of a CFEI 100 KVA Induction Furnace
awemawson:
Yes Matthew I have a manual which includes diagrams of all the power electronics but NOT the main microprocessor board sadly. The text descriptions are fairly sketchy as these things often are, but I had thought I might photograph a few pages and pop the over to you to peruse if I may.
Or I may run it through scanner and turn it into a .pdf - might make it easier - I'll kick a few things about tomorrow.
mattinker:
--- Quote from: awemawson on April 09, 2020, 02:08:48 PM ---Yes Matthew I have a manual which includes diagrams of all the power electronics but NOT the main microprocessor board sadly. The text descriptions are fairly sketchy as these things often are, but I had thought I might photograph a few pages and pop the over to you to peruse if I may.
Or I may run it through scanner and turn it into a .pdf - might make it easier - I'll kick a few things about tomorrow.
--- End quote ---
Great, could you include a photo of the manufacturer's plate in the pdf?
awemawson:
Well a day of two halves with greatly differing results !
I spent the morning scanning the manual into 'searchable pdf' format to send to Matthew - I have two versions - one came with the machine but is mainly schematics of the power electronics, and a second that CFEI sent me back in 2005 that has the same drawings but also quite a bit of text that looks to be mainly 'over view' type details in French. I started on the original manual as it is only 20 pages - when I opened the scan as a PDF it is NOT searchable - and I've tried all sorts of options in the Plustek application - total of 4 scans so far and still not searchable :bang:
So I set too thinking and closely examining those pictures from 2005 and what was happening today. Does a red indicator ON mean a fault - or does it go OFF for a fault. Should that 'phase sequence error light' be on or off :scratch: :scratch:
Well studying the circuits that I was scanning showed me that the two red lights indicating faulty 'Temperature' and faulty 'Ext 1' corresponded to two lines on page 10 feeding 24 volts to inputs on the main logic board. The temperature line was a series of 'normally closed' temperature sensors and interestingly that bit of the circuit has pencilled alterations as well. The 'Ext 1' one was apparently a simple link.
So out with the meter, and both those inputs are NOT at 24 volts - presumably an error 'up the chain' somewhere. Make up short temporary links, put my fingers in my ears and :
WE CAN PING
Obviously I need to chase the faults 'up the chain' and see what's causing it, but certainly the microprocessor board seems to be OK and the power electronics must be reasonably healthy to kick the furnace coil into oscillation :clap:
(It didn't help that the circuit diagram has '0 volts' and '24 volts' incorrectly drawn in each others connector block ! )
John Rudd:
Great to see you making progress .. :zap:
Looking forward to the next instalment..... :thumbup:
Pete.:
My phone has an 'image to OCR' function Andrew if you want to send me the PDF I'll attempt to make it searchable for text.
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