Re: [CAD_CAM_EDM_DRO] V.F.D. - 3 Phase motor problem --- need some advice

Abrupt stop or coasting stop?
A capacitor blew?
Disconnect power from machine
short any capacitor, just in case it is charged
Eyeball capacitor to see if it has physical trauma
disconnect one terminal from capacitor and
check with ohm meter or continuity tester
should be open or very very high resistance
bob







In a message dated 8/29/04 7:11:51 PM Eastern Daylight Time,
ja_erickson@... writes:

> While running my Bridgeport mill yesterday I heard a sound that
> resembled a cap gun going off, then the spindle motor came to a
> stop. I use an Automation Direct V.F.D. with all of its recommended
> fuses along with a conventional Bridgeport motor to drive the
> spindle, no other electronics are involved in my set-up. I would
> like to know if anybody else has experienced any problems like
> this.The fuses all check o.k. and there arent any loose or shorted
> wires. And is there any way to tell if the motor itself is o.k. by
> using a multimeter or some other device. any help is really
> appreciated.
>
> thanks
> jeff
>

You can at least check for shorts to ground, etc. with a multi-meter.
You will have to access the wiring at the motor and check from each
wire/terminal of the motor to ground. To get an accurate read though,
you should disconnect all of the wires that supply power to the motor
before you make the measurements. Although, if the motor did short it
would be likely that the VFD would have blown some fuses/breakers or
shown an over current condition on the display, if it has a display.

You can also check for voltage out of the VFD but it MUST be
connected
to a motor when you turn it on. Otherwise you can fry one of those if
nothing is connected to the output terminals.

Hope this is of some help.

Randy Abernathy
4626 Old Stilesboro Road NW
Acworth, GA 30101-4066
Phone / Fax: 770-974-5295
Cell: 678-772-4113
E-mail: cnc002@...


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