Oh Blimey I bought a CNC Lathe !!!!

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awemawson:
The unit runs off 24v DC but the sensors, which are two terminal inductive ones, are biased by an 8v internally generated supply that currently is giving 24v !

I think it must be a chopper / switched mode type but as yet I've not done anything other than a visual inspection. There is a pair of mystery components that will probably end up being transformers, but that's just a guess at the moment - my googling on the numbers hasn't given me any pointers:

vtsteam:
Nice -- its own little bus. Makes it easier to work on. No wonder they are expensive!

Seems you have a good chance of repairing it/them. :clap:

awemawson:
Things progress apace! :ddb: :ddb: :ddb:

The two 'Zero Speed' relays form two chains of contacts in the safety interlock circuit. A 'normally open' chain, and a 'normally closed' chain. The previous owner had wired out one half of the faulty relay. When I installed the replacement, I decided to strip out the wiring for both contact chains, and re-wire them. I did this mainly as the wiring was a bit tatty and several wires were not numbered and identified - it was easier to start again and do it properly. Turns out the previous chap mixed up two contacts.

Having finished the re-wire I powered up and started the controller, and thought - hang on that start up sequence sounds unfamiliar. Different relays clicking etc, then all the servo and axis drives came up with an unfamiliar code on their displays. I went round the front to the operators panel, and what do you know - the system had gone READY !

I went quite wobbly at the knees - I now desperately need to work out a safe sequence to start things up without causing loads of damage from my ignorance. It is complaining now of low hydraulic pressure - hardly surprising as the hydraulic pump isn't running. I know that the pump works as I've previously manually operated its relay to check its direction of rotation, but there must be some sequence to get the controller to start it.

I'm teetering on the brink of getting this beast doing things under its own steam

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spuddevans:
Woo Hooo!!!! :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap:

Well done, I can't wait to see the video of it working :thumbup: :thumbup: :thumbup:

Tim

Pete.:
Teriffic news - I don't think I can go to work tonight now :D

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