Re: Gecko 320 not pulsing

Hi,
The "singing" is good, now the servos are dithering and the G320 are
working as they should. So more correctly, the PDMX is not pulsing.
This may also be due to the SW not pulsing, or the parallel port not
pulsing ( not trying to be a smart-alec, just pointing out the logical
progression needed to trace down a falure of the expected. )

Now you are at the other issues, Steps to do:
1) Manually pulse the G320 to verify. For example get a 9v battery
with clips. Hook a 1K resistor in series with the positive lead.
Connect the other side of the resistor to the common on the G320
step/dir/com block. Take the negative lead and carefully tap the step
input. ( note: Add temp wires to make this easier )
If nothing happens, try reversing the positive and negative leads of
the 9v batt and repeat. !!!Always include the series resistor or you
may damage the G320 step dir inputs. When its steps make note of which
polarity is hooked to the common. The G320 have a jumper to reverse
the common as indicated in the G320 datasheets. Its under the cover.
The G320, if I remember, comes default jumpered internally as common
== +5, with the Step/Dir being active low pulsed.

2) Making sure your software is configured correctly to drive the
expected parallel port pins. SW should be out of Estop conditions.

3) Parallel port: Use a voltmeter,scope, or leds with a 220 - 1K ohm
series resistor, to verify pins states and if a pulse train is
present on the step pins.

4) Setting up the PDMX board and associated wiring. Double check
and verify pulse trains are present in step1 but now on the step dir
blocks.

5) Is the polarity from the PDMX correct in driving the G320
optocoupler inputs. Theres also a jumper on the PDMX board to set
this.

6) At this point if you cant resolve it, you may need to get someone
over with a basic oscilloscope to see whats going on at the parallel
port pins.

-Lee




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "callcbm2000" <callcbm@d...>
wrote:

> The motors stop turning and are singing with no faults . The

wireing

> to the motors had to be reversed. Thanks for the info. But now the
> interfaced board is not pulsing or turning the motors. the board is

a

> PMDX -120 . All the contacts work with the software which is master

5

> Tne motors are minerta rm servo . I beleive the size are some what
> adequate when the motors where wire backwards they move the gantry
> fine.I have set the dim switches to demo mode and still nothing
> happens I wired as the paper work stated.