| The Craftmans Shop > New from Old |
| Resurrection of a CFEI 100 KVA Induction Furnace |
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| awemawson:
So, after a suitable time interval I checked the NiCd battery and amazingly it's come up to a fully charged state :thumbup: So I plugged the main inverter PCB back in connecting the battery and mains. The fluorescent light tube lit and the LED was OFF - it should be the other way round ! I then made a close examination of the PCB, which only has four transistors and two diodes plus a bridge rectifier - getting it lit up with a torch to read type numbers (I'd intended to replace the lot!) I noticed what initially looked like a scratch in the PCB but actually was a crack. It's cheepo paxolin not fiberglass so not very strong. I identified no less than six breaks in copper tracks (remember this is new never used!). Scraping the conformal coating off the tracks I made solder 'bridges' over the damage and tried again plugging it in. Result - it now works as it should :clap: Now solder bridges are not going to be very reliable, and if I decide to use it I'll put wire links in to replace the tracks. I seem to remember I bought a 'job lot' years back when I was equipping the main workshop - they were genuinely unused but one was declared as not working so it must have been this one. Barely worth repairing as I can buy a new one for £25, but quite satisfying :thumbup: |
| Sea.dog:
"Barely worth repairing." BARELY WORTH REPAIRING? :bugeye: Wash your mouth out man :lol: |
| awemawson:
Well Graham it's two and a half hours into a three hour 'run test' and doing well - 2.4 volt battery down to 2.23 volts. So you'll be pleased to hear that I WILL put proper repair links on the PCB along with a bit of epoxy glue, re-assemble it and stick it over the sliding door entrance to the foundry - pictures will follow later ! |
| Sea.dog:
:beer: :D |
| russ57:
Amazing it worked at all with that damage... The score so far as best I can remember... Buy and restore 100kva generator Buy, restore and sell trailer for generator Clear and renovate outbuilding for generator Diagnose faulty chiller Replace chiller with total loss heat exchanger Find, test, restore bore hole Install bore pump and pump house Replumb irrigation system to allow use of bore water Replace coolant hoses Restore air over hydraulics Repair emergency light Install earth bonding between multiple outbuildings Clear room for furnace Build external storage cage for O/A cylinder storage (part of clearing) Reinforce shelving Install 3phase 'domestic' supply for 'ping' Repaired cold saw Provide enormous entertainment and education for the unwashed No doubt some I have forgotten. I'm hoping this is not the end, but maybe you have something even better in store... -russ |
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