Re: temperamental G's

Hi,
Its an optocoupler input so basically an led, and Mariss has an
integral series resistor. As long as the current is limited to less
than 16mA or so, the opto will be fine. Thats why I mentioned the
ubiquitous 9v battery for a quick check with a 1K to be extra safe
(<9mA limit). Sure there will be some bounce, but at least you can
quickly rule out the step/dir source as an issue.

From the symptoms, I'm leaning toward a power supply issue as a guess,
or something common to all 3 as Mariss mentioned.
Good luck on it.

-Lee

--- In CAD_CAM_EDM_DRO@y..., "cadcamcenter" <cadcamcenter@y...> wrote:
> studleylee wrote:
>
> << 1)do you have the 'disable' pin grounded in any way? >>
>
> The disable pin is not connected to anything.
>
> << 2)or maybe it is a simple as the port driving the step and dir
> inputs isn't producing enough current to drive more led's(opto
> inputs). >>
>
> Then this should apply also to the "good" driver box which is
working
> fine with the same D&D inputs. Anyway if someone has good
> information/link it will be nice to learn more about the pulse
and/or
> the optoisolator requirements - pulse width, high/low, rising edge
> etc.
>
> << 3)Try a 9v battery through a 1k resistor to drive the step
inputs
> to statically test the G210's by themselves. >>
>
> What you are suggesting is a "finger motor controller"? where by
> connecting a voltage source to a switch? and using the finger to
flip
> the switch on/off thereby creating a pulse train for input to the
> geckos? Sounds like a good simple diagnostic proceedure the pulse
> train thus created has the rising edge, pulse width, etc which I
> would like to try if no one raise any alarm bells. What does the
guru
> says? And shouldn't the battery be 5V?
>
> Bob Campbell: << Can you turn your lead screws by hand as if there
> was no power to the stepper motors? >>
>
> Went to check this out to report, but now faced with a new problem.
I
> connected up the working driver box and verified that the S&D
source
> is OK a short while ago. On reconnecting to the "temperamental"
box,
> there was no reaction to signals sent to the x- and y-axis, while
the
> z-axis motor started to make low level noise. The x-axis and z-axis
> motor cables were interchanged. This time, the x-axis motor start
to
> make noise. To continue the tests, the fuse to the offending axis
was
> removed. When the juice was turned back on, this time the other
axis
> which was silent now started to make noise similar (but not the
same)
> to sparking.
>
> mariss92705 asked:
>
> (1) Are the LEDs lit?
>
> Yes
>
> (2) If lit, check to see if the motors have holding torque.
>
> New problem (see above) now prevent me from checking this out.
>
> (4) Check if the PC +5VDC goes to terminal 10.
>
> By now I can recite the G201's terminal like I can recite the
> multiplication table.
>
> (5) Check to see if the PC is outputing step pulses (change PCs).
>
> I am using the infamous "black-box" so I'll have to change the
> controller. I will continue the tests with other controllers/PC
> later. If only there is such a thing as a CCED standard pinouts.
Hope
> Mariss new wonder will adopt a CCED standard pinout if using the
DB25
> so one doesn't have to go through the hassel of rewiring when faced
> with need to change controller, etc.
>
> Anyway, the other driver box is working with the PC/black-box, so
> this is not likely the cause.
>
>
> (6) If there is no torque, remove wire from DISABLE input and test
it.
>
> Terminal 10 Disable input not connected. Ditto for the good driver
> box so I suppose not connecting terminal 10 should not lead to
> problem like this?
>
> Thanks to all
>
> Peter