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Author Topic: Twin Steppers on slave axis  (Read 9867 times)

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Offline ger21

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Re: Twin Steppers on slave axis
« Reply #20 on: September 20, 2008, 07:36:15 AM »
Geckos will never draw more than 2/3 of the motors rated current, and usually will draw much less. So, first of all, 7x4=28, not 32 ;) 2/3 of 28 is 18.66amps is the max the Gecko's will draw, if all 4 motors are running at full power at the same time.
Gerry

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Offline Katoh

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Re: Twin Steppers on slave axis
« Reply #21 on: September 20, 2008, 08:18:08 AM »
sorry about my math for some reason I still was thinking each motor wanted to draw 8amps, Ill try that first before I start hacking into drive shafts and making major changes, its easier swapping a few wires then altering machinical parts. On the G201 just to make sure I'm doing it right you connect a straight wire between terminals 11 and 12 for max amps? Would I also be advised to use Standby enable setting on the jumper block to save a few amps or just use the default setting that I'm running now?
Cheers
Katoh

Offline Hood

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Re: Twin Steppers on slave axis
« Reply #22 on: September 20, 2008, 10:20:16 AM »
For Max amps you dont connect anything to the resistor terminals, leave them open.
Hood

Offline Katoh

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Re: Twin Steppers on slave axis
« Reply #23 on: September 20, 2008, 08:24:50 PM »
Thanks Hood
Ill keep everone posted on what happens when I try a few different things, wont be for another day or so now.
Cheers
Katoh

Offline Katoh

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Re: Twin Steppers on slave axis
« Reply #24 on: September 21, 2008, 12:30:00 AM »
Ive just a chance to change the motors from a serial to parallel connection, i changed both x motors and both y and had a little play with it. Well heres one for my books. the X axis in my Original Config one shaft twin motors x motor from BOB 1 X slave from BOB 2 top speed 5000mm/min without loosing steps or lock ups. The y axis with the twin motors running y motor from BOB 1 y slave from BOB 2 top speed of 5000mm/min without loosing steps or lock ups. Actually Mach wont let me drive the Y any faster its hit the mach limit. The whole machine is very comfortable running at 3000mm/min. Put through a basic not to complex programme, run the programme 10 times in a repeat and was happy to see that it returned back to zero.
Thanks to all how helped!
Cheers
Katoh

Offline Katoh

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Re: Twin Steppers on slave axis
« Reply #25 on: September 22, 2008, 03:24:19 AM »
Hi All Again
A problem has arisen were I can run a test program through Mach Eg x400 y400 then x0 y0 and have the machine return to zero time after time using speeds anywere from 2 to 7000mm/min, but as soon as I run a programme through mach (some previous project) the machine will not return to x0. I have tried motor tuning changing the pulse lengths, using exact stop using constant velocity nothing seems to fix this error. Doesn't matter wich programme I load its always out by a constant 3mm over the initial x0.
Cheers
Katoh