Emco PC120 Turn

[Chaz]

Fcking electronics.

New BOB, all works. Awesome.

I then start to permanently solder the wires. I solder the 0V Gnd wire, sparks. Seems like my 24V PSU (x 2) have taken offence to me soldering whilst they were powered and both are now faulty. Really surprised. On my machine, they simply dont power. On the bench, it trips a 16A breaker once the PSU powers. Odd.

Ive got two of these units. 24V 5A each it seems.

http://www.ebay.co.uk/itm/VERO-MONOV...-/281969319232

Ill contact the manufacturer to see if they can look at them or repair.

One PSU powers two of these - http://jmcmotion.en.made-in-china.co...ler-3m860.html - suppose could go higher voltage?

The other powers the BOB and a very small stepper driver for the turret.

Argh.

[m_c]

Soldering the 0V/GND should not of had that effect.
Is your soldering iron grounded properly?

[Chaz]

Soldering the 0V/GND should not of had that effect.
Is your soldering iron grounded properly?

Yep, perhaps that's the issue.

[Clive S]

Chaz most soldering irons are earthed so if you touch any live point you are basically shorting it to earth.. also those PS seem very expensive for a 24V 5A supply even a RS one like this http://uk.rs-online.com/web/p/din-ra...plies/1238020/ is cheaper.

[Chaz]

Chaz most soldering irons are earthed so if you touch any live point you are basically shorting it to earth.. also those PS seem very expensive for a 24V 5A supply even a RS one like this http://uk.rs-online.com/web/p/din-ra...plies/1238020/ is cheaper.

Thanks. Ive got similar on my other machines. I always believed that the iron is 'floating'.

[Clive S]

Thanks. Ive got similar on my other machines. I always believed that the iron is 'floating'.

Well I shouldn't really admit it but in the good old days of valves tv's the first thing we did was cut the earth off the iron one of the reasons was that one side of the mains was connected directly to the chassis and you generally worked on them switched on. I am in no way telling anybody to cut the earth off anything.

[Chaz]

Well I shouldn't really admit it but in the good old days of valves tv's the first thing we did was cut the earth off the iron one of the reasons was that one side of the mains was connected directly to the chassis and you generally worked on them switched on. I am in no way telling anybody to cut the earth off anything.

Ye, we did that too when I was an apprentice.

[Chaz]

So I emailed the local company for these PSUs. Keep in mind I didnt buy the units from them so I was not sure if Id even get a response.

Received this:-

The solder tip of your iron will be earthed and this is a different potential to the Ov rail which is not really “0v” but simply a DC return for the +DC rail and is therefore floating with respect to Earth. I am not sure of the effect on the PSU by doing what you have done – usually a thermal trip / breaker will have activated but if it isn’t anything obvious then all you can do is speak to the manufacturer which is not us, we simply distribute. The manufacturer is a company called EPLAX in Germany and you need to call them

So I have a few options. Let's assume they are faulty. I need roughly 10A if I do a like for like replacement although I am sure that the smaller driver and board take less than 2A. I could also increase the Voltage on the two main axis steppers. Would higher voltage be better or just remain with 24V all round?

Thanks

[m_c]

Without reading back through the thread to see what you have or have not changed, can the stepper drivers handle the extra voltage?

I'd suspect they've just used a generic power supply, rather than have two different ones, so you will most likely get away with a smaller one if one only powers a single motor.