On Sunday 17 February 2008, Dave Engvall wrote:
>On Feb 17, 2008, at 8:05 AM, Gene Heskett wrote:
>> <big snip>
>>
>> Which means we either use the disable points in the amps, or a
>> power relay to
>> kill the AC power to the ps feeding the amps as its not safe to
>> disconnect
>> the motors or the driver power with a hard connection. Even the AC
>> power
>> thingy could be fun as there is about 1/4 farad in its filters, so
>> that stop
>> isn't going to be instant. A second perhaps & way too slow IMO.
>> The amp
>> disable is the fastest of the bunch I suspect. And it is what I'll
>> use when
>> I re-build the setup for the 4th axis.
>>
>> The point about safety is well taken though Ray, thanks. I wish it
>> was safe
>> to hard switch the amps supply line, but I don't believe it is in
>> terms of
>> amplifier life expectancy.
>
>I like and use the amp inhibit. I've also tried killing the AC power
>( slow if your axis is moving at max velocity). I suppose one could
>disconnect the AC then crowbar the DC supply with a small (ohms)
>resistor in series with the SCR to limit dv/dt.
>If you look at Les Watts' big router he also installed small
>mechanical shock absorbers to soak up the kinetic
>energy of the axis.
>
>Dave
>
I hadn't noted that detail, or didn't understand what I was seeing. I'll go
look again, thanks Dave.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
It's all right letting yourself go as long as you can let yourself back.
-- Mick Jagger
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