Re: testing with multi-meter

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "andrewyslee"
<andrewlee@s...> wrote:

> Hi,
>
> When an axis (x-axis) suddenly fall silent, how does one goes about
> trying to locate the fault?
>
> This is what I have done:
> 1. interchange motors (x-axis driver side still silent)
> 2. change another driver (all axes OK)
> 3. Peep at Gecko's power LED (all LED on)
>
> This seem to show that the problem is either within the x-axis

Gecko

> (unlikely) or in the connection from the Gecko to the connector on
> the panel. Physically everything seem OK.

Electrically/electronically

> how does one test without a scope, with just a digital meter?
>
> Thanks

With power on, first, make sure you have the correct DC volts on the
Power Gnd (-) and + to VDC pins of the Gecko using your meter. If the
motor is "locked" with the power on and no signals it is a good sign
you have voltage and the Gecko power section is working. The last guy
with this problem turned out to have a blown fuse on the bad axis and
was not getting DC volts to the Gecko/motor.

If you have done the following you can pretty much rule out bad
wiring: With the PC and Controller OFF, take the X (bad Axis) STEP
and DIR signals and move them to the working axis (Y). Turn on your
power. Jog X. If Y moves, the signals are good. If not, suspect
your wiring or parallel port. If it jogs then It pretty much has to
be the Gecko or wiring between the Gecko and motors. If it fails to
move then the X signals are missing and the problem in in the
controller hardware or software.

Let us know when you find the problem.

> Andrew