On Fri, 6 Mar 2020, Gene Heskett wrote:
Date: Fri, 6 Mar 2020 18:38:53 -0500
From: Gene Heskett <[email protected]>
Reply-To: EMC developers <[email protected]>
To: [email protected]
Subject: [Emc-developers] nother Q for Peter C.W.
I have now put 2 ATD667LSG's on this block and have failed to get a
working index pulse into linuxcnc thru the encoder index pin of a 7i76D.
I've mounted it branded face against a block of alu, with a green 3 pin
socket to allow unplugging it quickly, and I jbwelded a piece of a nail
to the side of the drawbar cap/bolt retainer at the top of the spindle,
but I can't get a false out of it at any orientation of the nail or a
tool waved past it.
I've tried 2 new ones now, and they appear to be stuck high/true when
the connector is made up, but goes false about 1 second after unplugging
it. Attempting to measure the current gets a worst case of about 1.2
u-amps to ground, and that is not enough to pull it down to false unless
the dvm is replaced by a short to ground and shows zilch current to the
5 volts.
Trying to measure input current by inserting the dvm between its output
and the encoder-index in looks like a small capacitor charging, but
drops to zero current in nominally 1 second and stays there.
W4-W5-W6 have been tried both ways, but to the left s/b ttl and
everything except the ATS667 is ttl. Its supposed to be able to sink 25
ma up to 70 ma with a 12 volt supply, but its only getting 4.92 volts.
3 of them have been working on 5 volts on the lathe for going on 3 years.
Worked fine till the goop went to hell because it dissolves in 0-W20
synthetic spindle oil.
I'm bumfuzzled. Obviously I'm doing something wrong but what?
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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You can test the 7I76D index input in TTL mode by simply shorting it to ground.
The encoder inputs have 2K pullups to 5V. You can read the index pin status in
hal, for a 5I25/6I25 and a 7I76 (encoder 0) that pin would be:
hm2_5i25.0.encoder.00.input-index
I would check the ATS667 5V and GND connections, sounds like something is open
Peter Wallace
Mesa Electronics
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