Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Len-Tikular on March 31, 2015, 04:16:13 AM
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Which is best ?
My Break out board supplies PWM output 0-5v
If I use this to control my Inverter drive hence my spindle speed I will need to put the PWM through a PWM to 0-10v circuit to the input of my Inverter drive.
Alternatively, I could use one of my axis drives via an off the shelf Step/Dir to 0-10v to the input of my inverter.
Any advice on which is the better method?
Additionally, my BOB has two outputs for Fwd and Rev. I'm assuming if I use the second method I would not need these ?
George
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I have never used either to control a VFD so can not really say which would be best, however either one will almost certainly require the relays (Fwd/Rev) as the VFD will require these signals to let it know when to rotate and also when to change direction.
If you go with a seperate spindle controller then likely it will have the relays.
Hood
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Thanks for the reply,
I'm trashing the Chinese break out board and today I spent my Pocket Money on a Ethernet Smoothstepper with a Motion Control breakout board. ;D
I like the Break out board because the Smoothstepper sits nicely atop it.
So thanks for the advice. I'll have to wait a few days for the delivery but in the meantime I can look at my encoder disc and get that sorted.
I do believe that you mentioned in another post that only one slot is all that was needed.
Reading the Mach Lathe manual Art says 3 narrow slots and one slot 50% larger than the other 3.
If I only need one slot then the encoder disc on my spindle shaft should do as it is. It even has the original mount for the slotted opto! (picture attached)
George
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You used to be able to use multi slot discs but the reality was there was very little benefit if any at all. I think Art removed that functionality a while back when he was working on the driver, not sure if it was put back or even if I am remembering correctly.
If you had been still using the PP then I would say the slot would likely have needed to be wider, the ESS however will not have an issue with that so it should work great.
Hood