The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
AdeV:
More importantly.... did you manage to fix the tractor shed door, and how many deaf crows are there in the vicinity? :D
awemawson:
Ade aludes to a problem that I had when he recently visited (good to see you Ade). It may well be linked to the lathe issue - seems we've had a few significant power surges on our overhead power lines. During this period a friend has lost two roller shutter controllers, I've lost mine and the lathe packed up :bang:
So no - the shutter isn't fixed but I have a replacement (expensive) controller arriving on Monday.
And Steve yes these things definitely ARE additive - ah well just get on with it I tell myself and stop moaning !
AdeV:
It was good to catch up with you too, Andrew - It was lovely to chat in person.
What a pain about the controller! I don't suppose there's any reasonably priced anti-surge gear you can add where you power comes in, not for 3-phase anyway.
I still haven't got my new Boxford CNC out of the container.... I'm girding my loins to do it on Saturday (or maybe Sunday); it's a bit of a step down from the size of gear I'm used to... but at least I stand half a chance of moving it around on my lonesome!
awemawson:
Three phase surge arresters do seem enormously expensive Ade - it must be said though that since I fitted a single phase one to my external PIR LED floodlight it's been fine, but before it didn't last more than a few months (if that) before dying so certainly worth investigation as the shutter is fed from the same supply albeit on all three phases.
So apart from an oddity whereby the controller refused to power up with the battery connected but was ok without it I couldn't find any faults on the bench. There are two ram retention batteries in this 820T controller - one mounted on the RAM card that I think holds the PLC program and was the original cause of all that corrosion back in the beginning. And another mounted in the rear of the CRT monitor that I think backs up other parameters on the CPU card. This later one is now remotely mounted in a battery box. I did also re-locate the PLC battery in the same box to prevent anther corrosion event but the card failed and the replacement still has the battery on the card. Sorry if that is a confusing explanation but necessary for completeness !
Nothing for it but to return the 820T controller to it's rack and carry on. Relatively simple exercise only complicated by very poor access.
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However it does require a full reload which is quite an involved and time consuming process that sadly I'm getting too familiar with.
With it all connected I'm back to where I was with the Axis Enable line in the fault state ie not asserted. This is derived from the "Measuring Card" (which I had already exchanged for a known good unit) but presumably ultimately from the CPU card - it was changing this card that had left me unable to bring up displays on the monitor - I suppose reluctantly I'm going to have to repeat the exercise.
awemawson:
Well wasn't that fun :bang: :bang:
Dismantle, replace CPU card, full re-load, and . . . . . . . no change :bang: :bang:
I'm obviously missing something here as I'm getting dizzy going round in circles - need to find a quiet corner and have a major think.
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