Gentlemen,
tin happens to stand near to the transition metals in the periodic
system and thus tends to slowly turn from metallic (conductive) to
crystaline (noc-conductive) as time goes on. At room temperature this
takes very long, say 10 years or more, at low temperature faster,
especially below -20 or -30 degrees Celsius. I had such a problem with
my refrigerator where the temperature sensor or its plug developed high
resistance, freezing all the contents to -10 degrees over night. A
temporary means to fix this is to waggle the connectors from time to
time. Napoleons soldiers in Russia in 1812 had tin buttons on their
uniform trousers and jackets which turned into crumbs in siberian
winter, a great problem for the great emperor.
Always chose galvanized golden pins and connectors!
Peter
Am 06.04.2020 um 18:43 schrieb Peter C. Wallace:
On Mon, 6 Apr 2020, Jon Elson wrote:
Date: Mon, 06 Apr 2020 11:27:23 -0500
From: Jon Elson <el...@pico-systems.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Gecko Failure
On 04/05/2020 11:24 PM, John Dammeyer wrote:
Anyone ever run into this sort of thing with a G213V driver?
http://www.autoartisans.com/mill/G213V-Failure.jpg
It was running the Knee with a 1200 oz-in motor and 60VDC power supply.
Typical result of a high-resistance connection getting hot. And,
almost everybody in the industrial connector business makes these
"Euro-style" connectors, so I'm sure for cost reasons Gecko does
NOT use Phoenix Contact parts, but a Chinese equivalent.
It may also be that transistors in the Gecko failed and it put full
DC supply voltage on the motor winding
until fuses or whatever blew.
Jon
Yeah, its unusual for the drive power connections to fail since they
typically have low average current. Its much more common for the motor
connections to fail
The general problem with Tin connectors is that they have a positive
feedback failure mechanism if used anywhere near their current
limits, their contact resistance rises over time and heat exposure
and the higher the resistance,
the high the temperature and the faster this degradation progresses...
Peter Wallace
Mesa Electronics
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
Am 06.04.2020 um 18:43 schrieb Peter C. Wallace:
On Mon, 6 Apr 2020, Jon Elson wrote:
Date: Mon, 06 Apr 2020 11:27:23 -0500
From: Jon Elson <el...@pico-systems.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Gecko Failure
On 04/05/2020 11:24 PM, John Dammeyer wrote:
Anyone ever run into this sort of thing with a G213V driver?
http://www.autoartisans.com/mill/G213V-Failure.jpg
It was running the Knee with a 1200 oz-in motor and 60VDC power supply.
Typical result of a high-resistance connection getting hot. And,
almost everybody in the industrial connector business makes these
"Euro-style" connectors, so I'm sure for cost reasons Gecko does
NOT use Phoenix Contact parts, but a Chinese equivalent.
It may also be that transistors in the Gecko failed and it put full
DC supply voltage on the motor winding
until fuses or whatever blew.
Jon
Yeah, its unusual for the drive power connections to fail since they
typically have low average current. Its much more common for the motor
connections to fail
The general problem with Tin connectors is that they have a positive
feedback failure mechanism if used anywhere near their current
limits, their contact resistance rises over time and heat exposure
and the higher the resistance,
the high the temperature and the faster this degradation progresses...
Peter Wallace
Mesa Electronics
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
