General CNC Chat > Show"N"Tell ( Your Machines)
9x20 Chinese Lathe Conversion
Dan13:
Yes, ESS and quadrature output. Spindle doesn't have the quad output yet, but Greg is working on this.
That's right. This was what I was meaning regarding cutting the AC to the drive - you are relying on the bus voltage that's left in the drive just for a few seconds to brake the motor and this was what I was not comfortable with.
You can find the Emergency Stop description and diagram in this manual for instance: 2098-in001_-en-p on page 132.
Dan
Hood:
Might give that a try when its done as it may work better than Step/Dir spindle in the SS/ESS
The axis motor would stop instantly with an ovetravel so even less than a second to dissipate the power wouldnt be an issue. However the big drives I use have shunt circuitry and the wee drives I use active shunts, what it would be like without the shunts I dont know.
I just downloaded that manual and see the circuit you are talking about, strange thing is I cant seem to find anything similar in the 3000's manual I have. Have done a search and neither "Emergency Stop" or "Contactor Wiring" or" Emergency Stop Contactor Wiring" gives a hit, wonder why they would have it in the 5000 manual but not the 3000 ones?
Hood
Dan13:
Strange. Don't know. It's also in the Ultra 100 manual - same diagram.
Why do you think quadrature will work better than differential step and direction (you have line drivers I am sure)?
Dan
Hood:
Its not the step/dir being the problem as such but rather the implementation of Step/Dir spindle in the SS and ESS not being perfect. If you try and use Spindle Override it will seem fine then all of a sudden the pulse stream will stop for a fraction of a second then it will be ok again and thus I have SRO disabled on my machines. The same thing actually also happens during normal spindle operation but it is a lot less common. I likely notice it more because I have a heavy spindle ( Large spindle with gears, 250mm dia chuck etc) with a lot of momentum and it gives a right clunk when it happens.
Hopefully Greg will have a look at things when he is doing the quad spindle for you, I gave up hoping he would sort it.
Hood
Dan13:
Ah... that. I thought I was the only one reporting this to Greg. I don't tend to use SRO, but I see what you describe when I have CSS enabled - it would operate fine for minutes and then would miss some pulses and the drive would fault. Hope to be able to report how it goes with the quad signals.
Dan
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