1200mmX900mmX170mm 4axis cnc

[cropwell]

What your multi meter says, did you take any measurements?

No Sir, It was working fine as a VFD before I took it out. My next step is to double check the connections, but not today, I have had enough. I will start fresh tomorrow, but tonight is beer, roast chicken and relax.
This will be a new thread I'll bet. I don't want to hijack yours !!!

[Nickhofen]

No Sir, It was working fine as a VFD before I took it out. My next step is to double check the connections, but not today, I have had enough. I will start fresh tomorrow, but tonight is beer, roast chicken and relax.
This will be a new thread I'll bet. I don't want to hijack yours !!!

Do not worry about hijacking this thread,just bring the chicken and beers, I will buy some souvlakia with tzatziki also,lol!

[cropwell]

Do not worry about hijacking this thread,just bring the chicken and beers, I will buy some souvlakia with tzatziki also,lol!

Trad English Roast Chicken, Stuffing, Roast potatoes, parsnips and braised carrots, None of this forrin stuff

If you use a 5k bleed resistor, you will not have enough current going through it to significantly affect the PSU in operation and a 2W resistor should handle the current. I don't know what capacitor value you have but 5K will bleed down fast enough.

[Neale]

A bleed resistor might be useful while you are testing, but once you have a driver or two wired to the power supply, they look like a waste of time. When I checked my machine, the stepper driver power supply was down to a few volts within seconds of cutting power. Any resistor that drains down faster than that is going to need to be a fairly high wattage item, and is going to produce more heat than you probably want in the control box.

[Doddy]

A bleed resistor might be useful while you are testing, but once you have a driver or two wired to the power supply, they look like a waste of time. When I checked my machine, the stepper driver power supply was down to a few volts within seconds of cutting power. Any resistor that drains down faster than that is going to need to be a fairly high wattage item, and is going to produce more heat than you probably want in the control box.

Provided that the drivers are energising the stepper coils, and are connected, and that there are no failures in the system, and that there is no e-stop isolation.

I'll spend the £1 extra on any >50VDC PSU. Pays your money, takes your choice.

[Desertboy]

I know on the AM882 when you kill power the LED's flash for ~3-4 seconds extra then when you test the capacitors they drop to a few volts. Same with the VFD so I assume that has a load of capacitors as well, also if you notice PC's do the same thing.

I think it was joe's build where he used a resistor to drain the capacitors which I was going to do but given the AM882's drain them anyway I figured it wasn't a major issue.

I've been shocked with 240v a few times over the years lol but the worst shock I ever got was from a Playstation 2 PSU for several days afterwards I felt in physical shock, last shock was direct from the board lol we have old school fuse holders at work for each phase and one of the fuse holders was missing the screw caps so when I pushed the fuse into the board I was touching the screws than was fun ;)

Oddly enough I went through every fuse holder and chucked the ones missing the caps after that.

[Nickhofen]

I am starting to flirt with the idea of UC300eth and UB1 any opinions and ideas from where to buy are welcome.