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Emcoturn 120 lathe retrofit

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07 Aug 2016 20:30 #78458 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
would you use rs-485 or rs-232? I see a couple adapters, looks like rs485 would be cheaper but disregarding cost would it be better or worse?






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08 Aug 2016 11:18 #78482 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
I bought this one from Automation Direct


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08 Aug 2016 12:00 #78486 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
someone asked for pics of the lube system but I accidentally deleted the email. here are some.




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08 Aug 2016 13:47 - 08 Aug 2016 13:48 #78490 by Todd Zuercher
Replied by Todd Zuercher on topic Emcoturn 120 lathe retrofit

would you use rs-485 or rs-232? I see a couple adapters, looks like rs485 would be cheaper but disregarding cost would it be better or worse?


I am currently using the Automation Direct one you linked to to control 8 VFDs on a gang router. It works OK but I'm getting a lot of com errors. I have tried 2 different RS232 (DB9 port) to RS485 adapters, and have not been able to get one that works for me. The first one I tried I did not notice when I bought it can only transmit, it can't receive, it worked as good as it was supposed to, but wasn't what I wanted. The second one I bought I couldn't get to work at all. It's been a frustrating subject for me.
Last edit: 08 Aug 2016 13:48 by Todd Zuercher.

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08 Aug 2016 18:30 #78499 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
OK thanx, I have the AD one coming, hooefully with only 1 VFD it will not have com errors. I likely wont be polling it for any info either but you never know.

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09 Aug 2016 12:01 #78521 by andypugh
Replied by andypugh on topic Emcoturn 120 lathe retrofit
I am using one of the $2 ones from eBay. Seems to work fine.

However, I think that there is an error in your understanding:

I don't see any other way than relays for the 7i76e outputs as they do not switch the common on the VFD, they supply external voltage

This is true for the general-purpose IO outputs, but there are two special outputs for VFD:

SPINDLE ISOLATED OUTPUTS
The 7I76E provides 2 isolated outputs for use for spindle direction control, and
spindle enable. These outputs are OPTO coupler Darlington transistors. They are all
isolated from one another so can be used for pull up or pull-down individually. They will
switch a maximum of 50 mA at 0 to 100 VDC. The SPINENA output is special as it uses
the same signal that enables the analog output. When the analog output is enabled, the
SPINENA OPTO output is on.


These two outputs are effectively simple (if polarised) switches.

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09 Aug 2016 12:43 - 09 Aug 2016 12:49 #78524 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
thanx Andy. I thought I had asked that question and understood the 7i76e provided voltage which is not allowed. Can you tell me which ports act as a switch instead of a signal? I assume its these? So It would be right to connect the spindle direction and enable using the DCM and the D11 and D12 pins directly through the 7i76e?





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09 Aug 2016 12:48 #78525 by andypugh
Replied by andypugh on topic Emcoturn 120 lathe retrofit

I assume its these?



Yes. It will depend on the VFD whether the on/off and fwd/rev terminals need to be connected to VFD V+ or GND, but those terminals can do either.

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09 Aug 2016 12:55 #78526 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
OK, that makes sense, here is the setting to make them run/stop fwd/rev


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09 Aug 2016 13:21 #78528 by andypugh
Replied by andypugh on topic Emcoturn 120 lathe retrofit
Looks like DCM is "Digital common" which will be 0V.

So, connect ENA+ to DI1 and ENA- to DCM and connect DIR+ to DI2 and DIR- to DCM.

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