1200mmX900mmX170mm 4axis cnc

[cropwell]

Does it feel good to move forwards? :D

In my case it would be good to get back to where I started - spent the afternoon reassembling my lathe and getting the safety switches operating reliably. Then reinstalled the VFD (when I took it out months ago to fix the broken mounting lugs, I photographed the connections and labelled them as I disconnected each one). Now I am getting a code that says low DC bus. I sense a new thread coming if I can't sort it easily.

[Nickhofen]

In my case it would be good to get back to where I started - spent the afternoon reassembling my lathe and getting the safety switches operating reliably. Then reinstalled the VFD (when I took it out months ago to fix the broken mounting lugs, I photographed the connections and labelled them as I disconnected each one). Now I am getting a code that says low DC bus. I sense a new thread coming if I can't sort it easily.

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

[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.

[cropwell]

In my case it would be good to get back to where I started - spent the afternoon reassembling my lathe and getting the safety switches operating reliably. Then reinstalled the VFD (when I took it out months ago to fix the broken mounting lugs, I photographed the connections and labelled them as I disconnected each one). Now I am getting a code that says low DC bus. I sense a new thread coming if I can't sort it easily.

You find things out which are peripheral to the problem - code Lv on the VFD display only means Low DC bus and this is OK when the power is running down.

But I have diagnosed the problem - I reassembled with the microswitch that is for the headstock gear train safety cover swapped with the chuck guard switch (one is NC and the other NO). So my next session in the workshop will fix that and the covers will go back on. Job done ! No need for a new thread

[Nickhofen]

Those are good news cropwell, an easy fix is always preferable than something that will cause headache or need money to be fixed,right? ;-)

[Nickhofen]

UC300 with UB1 will cost 320$ with out shipping and taxes,this is far away from badget right now.....