Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: arboleda4 on April 06, 2010, 12:53:25 PM
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Hi
Problems with spindle control
Set at 500 rpm but when running it shows a true speed of -80 (minus) It is running at 500 on Tacho
Set at 1000 " " " " " " " " " " " -97 " " It is running at 733 on Tacho
The only speed which is stable is 500
Anyone know what I am doing wrong
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Update to the latest version and see if that helps.
Hood
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Hi Hood,
Did it last week but dont understand why there is a - sign either
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Some people have been reporting negative values for spindle speed if they have a fast computer and an older version of Mach. So if you have the latest then thats not your problem :(
What kind of setup do you have for the spindle, is it a VFD? Afraid I have never set up with a VFD but if you post details of what you have hopefully someone can help you out.
Hood
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Hi Hood
Excuse my ignorance but what is a vfd.
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Variable Frequency Drive, they are used to control 3 Phase AC Induction motors. I notice your title says D6000E so maybe that is some other kind of controller?
Hood
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The D6000E is A German Wabeco Model No and is single phase
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so how do you control the spindle?
Hood
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Motor is a 2kW varicon
Manual control by potentiometer, cnc control by Mach3
Been fiddling with the steps but dont quite understand what they do
When I started to set the spindle speed the step was at 20 giving the results in my first post
Changed step to 10000 outcome at1000 rpm on control 1414 rpm on tacho at 2000rpm 2400 rpm on tacho
Changed to 8000 outcome at 1000 rpm 1080 rpm at 2000 rpm 1850 rpm
Dont now exactly what I am doing obviously
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Do you have any links to documentation for it?
Hood
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Motor is a 2kW varicon
Manual control by potentiometer, cnc control by Mach3
Dont now exactly what I am doing obviously
I take it you mean you set the speed on the potentiometer manually
If that is the case you don't need to set the spindle motor up in motor tuning as Mach3 isn't controlling the spindle.
Do you have a sensor to read the speed ?
Have you set up a spindle pulley in Mach3 with the MIn & Max the same as your motor ? under CONFIG, SPINDLE PULLEYS
Phil
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I set the pot in manual only
When I switch over to cnc I need Mach to control spindle speed
There is a sensor on the head
Have set the spindle pulley as per manufacturer to 4
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Hi Hood
Only thing I can seein the book about the motor.
Motor with rotary frequency converter infinitely variable with continuous rpm surveillance and clockwise/anticlockwise rotation
230V 50 Hz 8.6A 2 kW 0-5000 U/min.
Was on to Pro Machine tools but not much info only that the motor tuning and set up on Mach is what is used.
As I said confused with the step entry and velocity. I really need to know what the step should be to get started as step and velocity entries make a huge difference.
I can get it set to run at say 1000 rpm but when you go to 500 rpm depending on the entry it is up or down.
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To control the spindle via Mach3 you need to feed it a voltage, this in the main is 10volts
When the VFD has 10 Volts the motor runs full speed when it has 5 volts it runs half speed & so on
Mach3 generates that 0-10 volts by using a phantom motor in motor tuning SPINDLE
These pulses then go to a speed control device that generates the 10 volts
Something like this http://www.cnc4pc.com/Store/osc/product_info.php?cPath=25&products_id=58 (http://www.cnc4pc.com/Store/osc/product_info.php?cPath=25&products_id=58)
Phil
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Phil
I have sound logic boards and Gecko drives
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Ok I got it fixed
Deleted all Mach3 software and downloaded new software.
Works but will open a new post
Cheers
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Just updated from 3.042-036 to 040 on the lathe, true spindle reads 36 for any speeds set on the MDI using M3S*********. Using a tach0 the spindle speeds checked appear correct
Denisian
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Just placed a 1nf capacitor across the spindle speed index input on the breakout board . The true speed now shows the correct speed? and the tacho reads the same speed.
Set index debounce to zero also.
Index debounce not working ? will have to get a smooth stepper.
Denisian