How to wire MPG on 7i77?

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19 Apr 2014 18:58 #46106 by greeder88
Replied by greeder88 on topic How to wire MPG on 7i77?
I'm using the Field IO Mpg configuration and pretty sure everything is configured right except I need to change from the default 100cpr scale.
Following the previous suggestion I need to change jumpers for single ended outputs.
Using encoder 05 pins 17,20,23.
There are three jumpers. Which jumper is the one I have to change?

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19 Apr 2014 20:59 #46108 by PCW
Replied by PCW on topic How to wire MPG on 7i77?
W9 and W7 should be moved to the left hand position for single ended A,B encoder signals on encoder 5
The index (TB4 pin 23 and jumper W3) need not be connected/changed since index is not used for jogging.

Note that this is not a field I/O MPG connection but rather using a
normal servo feedback encoder input for a MPG.

(the field I/O MPG encoder inputs are on TB7 pins 16,17,18, and 19)

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01 Jan 2017 23:55 - 01 Jan 2017 23:56 #85047 by OT-CNC
Replied by OT-CNC on topic How to wire MPG on 7i77?
Hi,
PCW, can you clarify if it's okay to wire a 5v MPG to the pins 16 and 17 (channel A and channel B ) in software mode 3? I'm using 24v for the field IOs and I'm powering the MPG via the external 5V on TB1, jumper W5 to the R. Should I connect my grounds from TB1(5v) to TB2 (24v)?

TIA and Happy New Year!
Last edit: 01 Jan 2017 23:56 by OT-CNC. Reason: B) created emoticons, changed to B )

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02 Jan 2017 02:25 #85054 by PCW
Replied by PCW on topic How to wire MPG on 7i77?
Yes that's fine

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02 Jan 2017 02:47 #85055 by OT-CNC
Replied by OT-CNC on topic How to wire MPG on 7i77?
Thanks PCW for the quick reply!

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02 Jan 2017 04:13 #85058 by OT-CNC
Replied by OT-CNC on topic How to wire MPG on 7i77?
Okay, that works. Out of curiosity, on TB2 field power connector on the 7i77, pin 8 being ground, are pin 6 and 7 by any chance also ground? Manual names them NC. What does the NC stand for? I assume not connected in this instance.

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02 Jan 2017 05:23 #85061 by tommylight
Replied by tommylight on topic How to wire MPG on 7i77?
Yes, that means not connected. I did not test them as i also tok it as is, not connected.

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02 Jan 2017 08:19 #85064 by rodw
Replied by rodw on topic How to wire MPG on 7i77?
This is as good a spot as any becasue I've been trying to connect a MPG to my 7i76e today. I was actually referring to this topic earlier today.


I have got the MPG wired up to the board (after jumpering the Field Power GND (TB1.8) to the ground on the 5V step/dir side (TB3.23). I'm grabbing 5V power from one of the stepper interfaces and the Encoder is wired to Field Inputs 16 & 17.

That works perfectly and I can see hm2_7i76e.0.0.encoder.00.count increment up and down in the HAL Configuration window in Axis. But I can't for the life of me get it to jog the axis. Here is what I put in HAL.
setp axis.x.jog-vel-mode 0
net x-jog-scale <= 1
net x-jog-scale => axis.x.jog-scale
net x-enable  <= hm2_7i76e.0.7i76.0.0.input-10
net x-jog-count <=  hm2_7i76e.0.0.encoder.00.count
net x-jog-count => axis.x.jog-counts
net x-enable => axis.x.jog-enable

I suspect that the problem I have is the MPG is not enabled at axis.x.jog-enable
hm2_7i76e.0.7i76.0.0.input-10 is wired to a temporary switch and I can see it operate on the PC side.

But the signal is not even getting to x-enable

I have not got a switch for scales so I've left out allof the mux4 stuff for now. So what have I missed?

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02 Jan 2017 16:38 #85086 by OT-CNC
Replied by OT-CNC on topic How to wire MPG on 7i77?
I checked with a multi meter and pins 6, 7 and 8 appear to share the same ground on the 7i77. I'd like PCW to confirm that that is indeed correct before I utilize those connections.

rodw,

That looks like the same MPG I got off Ebay :)
Sorry I can't help you with the HAL cofig. I'm just getting started on that as well.

Anyone know what value pot I should look into If I want to have a remote feed override on the pendant or control panel?
This would utilize mode 3 again and I assume the 4 analog inputs 0-3 on TB-8 ?
Should I run this off the 5v or use the field 24v?

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02 Jan 2017 16:50 #85088 by andypugh
Replied by andypugh on topic How to wire MPG on 7i77?

IAnyone know what value pot I should look into If I want to have a remote feed override on the pendant or control panel?


A small encoder is likely to work better, as it can more easily cooperate with other controls.
(I mean something like the 16-click ones that are in the same format as a potentiometer that can be had for $2 on eBay)

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