The Craftmans Shop > New from Old
The Sequel - Oh Blimey I bought a CNC Lathe (Beaver TC 20)
awemawson:
And in some cases the digital outputs will be quite dynamic. For instance the 8 bits shown as '1's ' on the above picture are the data bus that the PLC uses to talk to the SMCC card that is a slave PLC that controls the tool turret - wheels within wheels comes to mind!
Joules:
A cheapish logic analyser and big bunch of resistor arrays ?
vtsteam:
Good to see you working on this Andrew! :beer:
awemawson:
Thanks Steve - yes I'm a bit more able to get my head arround things now thank goodness.
This morning I went through all the digital outputs and proved that they were in the same state that the 'Q' words in the control were at - they were ! I suspect that the digital input output system is actually fine though it's not conclusive on the outputs as I can only observe rather than drive them.
However I HAVE found that the drive circuit for the main spindle drive is reporting an error - it also has a tell tale red LED that should be 'on' but it isn't. Fortunately I do have a spare so I'll install it when time permits - ATM waiting to meet and greet two sets of cottage guests whose arrival is imminent. (sounds of thumbs twiddling!)
awemawson:
More positive progress this morning. Yesterday late on I found that the red 'I'm OK' LED on the main spindle drive for it's field windings was 'off'. Fully expecting to have to change the card - I have spares - I did a bit more research. That LED isn't going to glow when the card has no power :ddb:
Tracing it through I ended up at manual contactor 'MBS' (a Telemecanique GV1-M07) which is as thermal trip. It wasn't latching on properly. With the power off a few cycles of exercising it got it to latch.
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Ebay has provided a reasonably priced 'new' one so I've ordered it just in case.
This got things moving - well it did when I remembered that the console 'Keyswitch' needed to be vertical to allow input !
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So now I'm back with a machine that basically works except for the tool turret. I can jog axis's about and control the main spindle. bit of a relief really as this latest excursion up an other alley has been a diversion from the main quest of mastering the turret.
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