Thread: Irregular Spindle Speed
no data sheet so it could be available in both
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They show 2 different PDF. One for the 220v another for 380V which suggests it's not dual voltage which is changable via usual methods. Also there is no Star Delta connection on the connector which also backs this up.
I'm keeping out of this one on the grounds that I have had a drink..Clive
Hello guys and thanks for the input.
We have taken some more images attached below.
Also we have removed the new spindle and re installed the original colombo the CNC came with just to see if we still have this irregular speed issue.
The colombo spindle seems to be spinning fine with just about 3-4 hertz up and down movement on the VFD. But we seem to have a new problem .... when starting a G-code the spindle will spin up to the specified S value in the code, but as soon as the axes start moving the spindle will go to maximum speed. We have reloaded the original XML data into mach3 to have the same settings as when we got the machine but all the same. Any input on this would be greatly appreciated.
Since the colombo isn't usable until they fix the threads on the chuck will have to try and set up the new Chinese spindle.
Please see the wiring pictures attached. If you need any more specific ones please let me know.
Also this current issue with the colombo highlighted some serious dangers that minor software issues can cause. We had incidents before when an apprentice spun the spindle with a tool not intended for that code and well.... the tool was flying across room in pieces as instead of 5000 RPM it was spinning at 18000 RPM. So if someone could explain us how to control the spindle straight from the VFD instead of going through Mach3 that would be great as a backup option for the future. We have a smaller machine on which we control the spindle from the VFD and although it takes a bit more time it might be safer.
We still don't know if we have a star or delta connection but hopefully the attached pictures shed some light on that.
Again thanks for all the help and have a great weekend.
The Plug that supply's the whole system:
The Colombo wiring:
The new Chinese spindle wiring:
Photos of the inside wiring:
Ok well the chinese spindle is wired Star(380v) so you need to change it to delta. This will cure your speed problem.
Remove the screws and those gold jumpers can be changed around. Set them like the pic.
Regards the Speed changing when code runs then are you 100% sure the code isn't changing the speed.? Other than that then would need to see the XML to make sure spindle is set correctly.
Regards the VFD Speed then unfortunatly it's one or the other. Yes can make speed adjustable from VFD with quick parameter change but you will lose external control via Mach3.
Thanks Jazz it makes a lot more sense now. Will wire the spindle to delta on Monday and give it a try.
Regarding the speed change I am 100% sure that the speed does not change during the code as we have used an old code also we dont have a tool changer so we keep spindle speeds constant for each individual code.
Regarding the XML File would be glad to share it with you to take a look as we are unsure about its correctness specially when considering the fact that the support doesn't know mach3 and claim that the guy who set up our machine has left the company :) That makes me wonder if there was a lot of thought put into motor tuning.
Will only be able to share the XML data on Monday but thanks for the help.
Just a thought check to see if the motor is running in the correct rotation when done. If it does not you will have to swap over any of the 3 phases...Clive
Just to make sure although it might be a dummy question, but do we remove the back cover on the chinese spindle to do the re wiring as that does not have an electrical box on the outside. So my guess is that is somewhere under the cooling fan assembly.
Will be uploading the XML data later today.
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