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Transwave Static Converter gone phttttt

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John Swift:
Hi Bluechip ,

that's a good result , just what we want :beer:

considering its a 50: 50 chance ,  on a good day I manage to get the direction wrong 70% of the time  :lol:

I'm sure some where I've have a simple circuit to display the phase sequence for a 440V 50Hz supply 

    John

found it! --  single phase  indicator and 3 phase sequence indicator using NE2 bulbs

HS93:

--- Quote from: Bluechip on June 13, 2012, 03:26:57 PM ---Hi Troops

The static converter has gone pop on my Myford S7. It appears to have lost a phase.  :zap:  :scratch:  :bang: during the arduous task of tapping a M4 thread in brass.

As the thing appears to date from Nov. 1991, I am not inclined to faff around with it too much.

The output is 415V, or rather was when it was alive. Now have phase to phase volts of 422V / 0V / 411V

[1] Anyone got a schematic of the damn thing ?? If it is just a shagged capacitor I might just give it the benefit of the doubt and refurtigrate it.

[2] Anyone fitted a Newton Tesla VFD to a S7, if so, why are there apparently 2 versions ? ie 1/2 HP & 1 HP ?

The Transwave one I have is 1/2 HP. I see no point in fitting a larger one, but is there a reason why more grunt would be an advantage ?

A much miffed ...

BC

--- End quote ---
I fitted a newton tesler didn't get it all boxed just motor and controller (cheaper) for my ML10 took 5 min to wire up they are very helpfull I got a new motor at same time it,s a bit bigger than 1/2 HP not much and he said they fitted these on ML7s as well he programed it all up took the brake right down so the chuck doesent unscrew and is helpfull if you have queries great people to buy off , oh and 5 min from my house  :headbang:

Peter

Bluechip:
Hi Peter

Did have a look at the N-Tesla solution, but I'm not very keen on the motors. Transwave do some 3/4 HP jobbies which appear to be TEFC motors. [ TEK ?? ].

Myfords have a nasty habit of sucking crap into the motor, despite their crude attempt at a shield.

So, if I kept the machine, I would not really consider the ones with vent slots. My old ML7/T had two motors ingest crud and go pop in no uncertain fashion.  :zap:

I'm thinking of dumping the S7 in favour of a Wabeco, even if I fitted a VFD to the S7, it won't do anything about the miserable sized hole thro' the mandrel ...  :( which is a constant source of annoyance to me. The only caveat being the Wabeco has no SC gearbox, but then I don't do much screwcutting anyway.

BTW Mr. Swift ...

I like the ESR circuit, may just have a bash at that ..  :thumbup: I seem to have most of the bits ..

As for the lathe going the wrong way ... how can I put it ??  ... Maybe I should have looked at the Motor FWD/ REV switch on the control panel first ...  :doh:  :doh:

I think I might need a Carer ... :scratch:

BC

Stilldrillin:

--- Quote from: Bluechip on June 15, 2012, 05:43:23 AM ---
As for the lathe going the wrong way ... how can I put it ??  ... Maybe I should have looked at the Motor FWD/ REV switch on the control panel first ...  :doh:  :doh:

I think I might need a Carer ... :scratch:

BC

--- End quote ---

Heyup Dave!

Remember our last little fumble, with my little lathe?

After you'd departed. I found it went faster, in reverse..........  :palm: 
Consistency!  :thumbup:

Swapping the motor wires around, sorted things.  :D

(It's still pulling like a train)......  :beer:

David D

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