New Build - Tree VMC 1000

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21 Aug 2012 07:20 #23460 by robh
Replied by robh on topic Re:New Build - Tree VMC 1000
have to watch out when using inverters instead of real spindle drives...
they work, can talk to the induction spindle motors fine.. but they just cant drive the spindle motors as well as the spindle drives unless u are ready to pay some good money for a inverter.

ull find ramp times are not as fast on getting up to speed.
u will also need a bigger unit then what they think you do as the current draw is quite sharp to get motors upto speed.
also watch your spindle speeds you need, if you only have 6000rpm most inverters will be ok in Hz mode...
but if you can run in vector you will find you will have much better response but not many inverters can do vector over 4000rpm

if i was going inverter id go Yaskawa as they still fit inverters into CNC machines

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21 Aug 2012 14:46 #23481 by dangercraft
I think I am going to go ahead and keep the original spindle drive, but I'll take JR's advice and replace all the power caps. I'll then run the spindle drive open loop and let linuxcnc close the loop.

Here are some pictures I took:
Bubba Guarding the foundation area...
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21 Aug 2012 14:46 #23482 by dangercraft
Table after a little weazle piss...
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21 Aug 2012 14:47 #23484 by dangercraft
Servo Drives...
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21 Aug 2012 14:47 #23485 by dangercraft
Servo Drives ID plate...
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21 Aug 2012 14:48 #23486 by dangercraft
Servo motor height...
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21 Aug 2012 14:49 #23487 by dangercraft
Servo motor length...
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21 Aug 2012 14:51 - 21 Aug 2012 14:52 #23488 by dangercraft
Servo Motor ID Plate...
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Last edit: 21 Aug 2012 14:52 by dangercraft.

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21 Aug 2012 15:16 #23490 by dangercraft
My boy Jackie inspecting the old iron. :)
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21 Aug 2012 15:36 #23491 by andypugh
dangercraft wrote:

Servo Drives...


It looks like it might be fairly simple to work out what wires do what.
The three balck ones out of each drive probably go to the motors, the 6 or 7 in the other connector probably go to the Resolvers.
That leaves just the red/black and blue wires.
red/black might be logic power, or equally might be the +/-10V connections. A multimeter ought to sort that out.
Guesswork on where the wires go to is going to be the best start.

Those are big motors, and OK looking drives, and you know that they used to work well together. You can spend an awful lot of money replacing them, and stil not know for sure that the motors and drives are a good match.

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