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Emcoturn 120 lathe retrofit

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15 Jul 2016 01:23 - 15 Jul 2016 01:26 #77474 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
I am currently set with these options. what I need is to recode the pin designations to work with the fwd, rev and stop shown in the last picture in light blue




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Last edit: 15 Jul 2016 01:26 by LutzTD.

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15 Jul 2016 16:21 - 15 Jul 2016 16:31 #77507 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
looks like I need a relay for the spindle, yippie :unsure:

ENA- ---> GND
ENA+ ---> RELAY COM
RELAY NO ---> FWD
RELAY NC ---> REV

RELAY COIL+ ---> +24V
RELAY COIL- ---> DIR+
DIR- ---> GND
Last edit: 15 Jul 2016 16:31 by LutzTD.

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15 Jul 2016 16:41 - 15 Jul 2016 17:16 #77509 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
revised spindle connections, I will likely put the 5v pot back as it looks like the problem was the direction and enable. I will see if I can start from the panel and control speed with the pot until I get the relay


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Last edit: 15 Jul 2016 17:16 by LutzTD.

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18 Jul 2016 16:13 #77599 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
revised again. as far as my ME background circuit reading tells me, the VFD wants its logic ground as the signal for direction so I have this thought to use two relays. Can the 7i76e be used to act as a relay for an external signal ground? If not I will have to use relays. This assumes it picks the direction (fires direction relay) before it enables the spindle.


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18 Jul 2016 17:04 - 18 Jul 2016 17:05 #77601 by PCW
Replied by PCW on topic Emcoturn 120 lathe retrofit
The 7I76E spindle enable and direction outputs are uncommitted OPTO outputs
so can replace a relay up to their current and voltage limits so normally no
relays are needed unless the drive cannot be programmed for ENA+DIR
vs FWD+REV mode
Last edit: 18 Jul 2016 17:05 by PCW.

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18 Jul 2016 19:54 #77612 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
the drive has no enable. it only has fwd and rev that use the VFD logic ground. Can I use the 7i76e to switch the ground signal? Then I guess I dont need the enable signal at all?

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20 Jul 2016 08:58 #77685 by andypugh
Replied by andypugh on topic Emcoturn 120 lathe retrofit

the drive has no enable. it only has fwd and rev that use the VFD logic ground. Can I use the 7i76e to switch the ground signal? Then I guess I dont need the enable signal at all?


Yes, I think you can probably just ignore the 7i76 enable output.
Do you need to be able to run the spindle backwards?

What does the VFD do if you activate (using wires) both FWD and REV inputs?

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20 Jul 2016 13:38 #77713 by PCW
Replied by PCW on topic Emcoturn 120 lathe retrofit
Since FOR and REV need to be grounded, one way to do this is to switch a SPDT relay with the DIR output,
connect the relay common to ENA+ ground ENA- and connect the relay NO and NC pins to FWD and REV

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20 Jul 2016 13:44 #77716 by andypugh
Replied by andypugh on topic Emcoturn 120 lathe retrofit
I think I might be tempted to wire ENA+ to FWD, ENA- to GND, DIR+ to REV and DIR- to GND, then see what happens.

It should work normally for Forwards spindle, and will either error in reverse, or just work. It depends on the internal VFD logic when both FWD and REV are true

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20 Jul 2016 18:37 #77731 by LutzTD
Replied by LutzTD on topic Emcoturn 120 lathe retrofit
pretty sure I saw in the manual if both a grounded it does not turn. I would need reverse for boring ops to keep the cutter on the same side of the tool holder and for tapping, so I would like to keep that option open. I dont mind having 1 or 2 relays, no issue either way, I have some on order so it will just effect my spare count.

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