Re: [Emc-users] A question on relays.

[Gregg Eshelman]

Standard "automotive" relay, also used for various other things. I'd expect 
there to be some number-letter designation stuck on it by one of the many 
electrical standards agencies and committees.
If you want relay hell, get a 1990 Chrysler Lebaron coupe or convertible. It 
has a relay panel way up under the dash on the driver's side with a dozen or 
more of them all packed tight together with as close to zero gaps as they 
could. The only way to get one out of the middle is to wiggle one loose at the 
edge then the next, and then the one you need to replace.
I snagged what's supposedly a 40 amp one for free at a junkyard yesterday. Will 
see how long that one lasts.



 
  From: Dave Cole 
 To: emc-users@lists.sourceforge.net 
 Sent: Saturday, August 20, 2016 12:33 PM
 Subject: Re: [Emc-users] A question on relays.
   
That looks like a standard Ford pin out relay.

I think I have 6-12 of those in my Ford truck fuse/relay box less the 
molded on tab.  They are used for all kinds of things.
The numbering/diagram on the side of the relay shows the pin out and 
function.  All very standard.

Scroll down on the Amazon page and you will see a socket for that relay.

There are likely millions of those relays operating everyday in cars and 
trucks.

Every auto parts store in the US likely has dozens of those in stock.

FWIW, Bosch makes good parts, but they are not the cheapest. Look on 
Ebay and you can oftentimes find new Ford OEM parts like that in 
quantity for cheap.
I had to buy some Ford 4 pin relays recently and I think I paid $8.50 
for 3 relays with free shipping off Ebay.
The relay was bad after I crushed it trying to remove it with pliers to 
debug the electrical system.  :-(
They sometimes get stuck in the fuse/relay boxes sockets.

   
 
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Re: [Emc-users] More news & ? from WV.

[Gene Heskett]

On Friday 19 August 2016 23:16:47 Gene Heskett wrote:

Had to quit for much of the rest of the weekend, need some steel, and TSC 
doesn't satisfy my hunger with their crappy hot roll.

But I've a question, based on what I know about steppers.

That 1600 oz/in I took off the mill that was falling over at 30 ipm going 
up is being a puzzle.  The 9x0 oz/in I put on in its place has no 
problem with 90 ipm.

But I wanted to see what might be its limits just laying on the table, 
with the same 60 volt psu, and the same DM860 driver. I hooked it all up 
and drove it with my function generator.  At 100 revs, it could run the 
rotisary spinning this house.  So I cranked up the kilohertz, after 
setting the DM860 for its nameplate rated 3.5 amps. and a /16 divisor.  
That label on the DM860 tries to fool you, its minimum divisor is 2.

It finally stalled at 150 kilohertz!  By my calculator, that is at least 
20x what it could do as the z drive on the mill.  I did have to sneak up 
on the frequency above 20 kilohertz, but that was way faster than it 
could run on the Z axis of my mill. I suspect a properly configured 
lowpass placed in front of the PID could make quite a difference in its 
ultimately attainable speed. Spinning that yard and a half long 2505 
screw at 1/1 should be a piece of cake.  Just don't expect that the 
saddle and screw are zero inertia.  This is obviously bigger iron. But 
this new apron will weigh, even with the X motor on its rear face, 
likely 10% of what the OEM apron weighed, and that cannot help but help 
overall..

That I expect will seriously cause excess over shoot getting turned 
around when rigid tapping.  A lag in the turn around at spindle reversal 
would I hope, throw a following error.  One might use a rising following 
error to reduce the spindle accel allowing Z to catch up.  That would be 
the ideal I'd think. Just shutting it all down will stop Z ok, but the 
chuck etc will still coast enough to bust the tap, and that is not a 
desirable result.

Question: How will the following error be handled in a G33 or varient 
thereof?  Or is that a never mind given the mass of an 8" chuck to be 
turned around gently enough it won't unscrew itself from the spindle 
nose?  Following error should not uncouple that electronic gear lock

In due time such questions can be answered, but I'd like to head off such 
problems before I get to the "pass" if I can.

Comments?

I should have that induction heater module Monday, its someplace in PA 
when I looked this morning. Which end of PA, I don't know.

Thanks.

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)
Genes Web page 

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Re: [Emc-users] A question on relays.

[Dave Cole]

That looks like a standard Ford pin out relay.

I think I have 6-12 of those in my Ford truck fuse/relay box less the 
molded on tab.  They are used for all kinds of things.
The numbering/diagram on the side of the relay shows the pin out and 
function.   All very standard.

Scroll down on the Amazon page and you will see a socket for that relay.

There are likely millions of those relays operating everyday in cars and 
trucks.

Every auto parts store in the US likely has dozens of those in stock.

FWIW, Bosch makes good parts, but they are not the cheapest. Look on 
Ebay and you can oftentimes find new Ford OEM parts like that in 
quantity for cheap.
I had to buy some Ford 4 pin relays recently and I think I paid $8.50 
for 3 relays with free shipping off Ebay.
The relay was bad after I crushed it trying to remove it with pliers to 
debug the electrical system.  :-(
They sometimes get stuck in the fuse/relay boxes sockets.

Dave


On 8/18/2016 9:36 PM, Gene Heskett wrote:
> On Thursday 18 August 2016 20:53:21 Gregg Eshelman wrote:
>
>> Is there an industry standard designation for the contact arrangement
>> on the common 12 volt DC relay that has five spade lugs like this one?
>> https://www.amazon.com/dp/B0010ADJIE/
>>
>> I want to find a 12 volt relay for that style socket with the highest
>> amp and heat rating available, but without knowing exactly what that
>> base type is called, I keep getting results for huge numbers of relays
>> that are incompatible. What would be ideal is a solid state "ice cube"
>> relay of that same external dimensions, without a mounting tab, and
>> able to handle 15~20 amps at elevated temperature. That's quite likely
>> a unicorn...
> >From the looks of it, and the fact that no one puts an uncommitted pin in
> anything, my best guess is that is a single pole, double throw, an SPDT
> iow.  If you can find two terminals with only an ohm or so, that would
> be one set of contacts that are closed when its not energized, and two
> terminals that show 50 to 200 ohms, then that should be the coil. When
> 12 volts is applied to the coil, the original 1 or 2 ohm connection
> isn't there any more, but you now have a connection from one of those 2,
> to the terminal left.  Single pole, double throw.
>
> Cheers, Gene Heskett

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Re: [Emc-users] Profibus, parametrization frame

[Michael Büsch]

On Thu, 18 Aug 2016 20:31:13 +0200
Nicklas Karlsson  wrote:

> Does anybody here have any experince of the data in the parametrization frame 
> for profibus?


All information needed for the SetPrm usually is stored in the GSD file.
So you just need to know your configuration and select the right data
from the GSD.
But there is one important exception: The three DPV1 parameter bytes.
These bytes are only there for DPV1 (and later) devices and they often
are not specified (=zero) in the GSD. So you need to set them manually.

The GsdInterp GSD file parser/interpreter from pyprofibus [1] will
probably help and do the right thing to create a SetPrm telegram.
See the example files included that use the parser (and the pyprofibus
configuration mechanism) to create the SetPrm and ChkCfg telegrams.


[1] https://bues.ch/a/profibus

-- 
Michael


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