Encoder Wiring

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26 Feb 2022 19:08 #235860 by Kylizer
Encoder Wiring was created by Kylizer
If I should post this elsewhere please let me know and I will but on my encoder I have 5 wires coming from it that run into a bundle inside of another loom, ok. now at the other end though there are 6 wires coming out from it. I researched and am thinking it could be a drain wire. If it is a drain wire what purpose is it and where should I even run something like that too. I have attached a picture of my encoder wiring. See there are 5 wires going out but down the line on the other end there are 6 wires coming out. 
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26 Feb 2022 20:03 #235867 by PCW
Replied by PCW on topic Encoder
I would check if the drain wire connects to frame ground,
If so, I would leave it unconnected at the 7I97 end.

Note that these are single ended encoders so the 7I97 encoder jumpers
must be set for single ended (TTL) mode

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28 Feb 2022 03:17 #235981 by cngbrick
Replied by cngbrick on topic Encoder Wiring
Kylizer: Can you post a picture of the other end of the cable? The 6th wire may just be the shield drain for the encoder cable. In a typical installation, the shield drain only connects at one end. I would normally tie the shield drain to the encoder 0V or ground terminal on the board side but defer to PCW in this case as he designed these boards.

PCW: can you clarify your answer? I assume you are stating that if the 6th wire is connected to the motor frame then in that particular case it should not be connected to the 7I97 but that does not address the case where the 6th wire is the encoder cable shield drain and not connected to the motor frame.

RT

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28 Feb 2022 03:30 #235982 by PCW
Replied by PCW on topic Encoder Wiring
If the 6th wire is only connected to the encoder shield
(not motor/frame ground) I would connect it to encoder
ground at the 7I97, but I would verify what the 6th wire
_is_ connected to first.
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28 Feb 2022 19:10 #236028 by Kylizer
Replied by Kylizer on topic Encoder Wiring
Here is where it comes from encoder. Then to the bundle and then the other end of encoder harness 
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28 Feb 2022 19:22 #236029 by PCW
Replied by PCW on topic Encoder Wiring
Its not connected to the encoder so I would leave it unconnected
at the 7I97 end
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28 Feb 2022 19:50 #236031 by Kylizer
Replied by Kylizer on topic Encoder Wiring
Layout
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28 Feb 2022 22:58 #236061 by Kylizer
Replied by Kylizer on topic Encoder Wiring
Went and double checked and I indeed had it set to differential. Switched it over to and sure enough I got it to read out on the dro when I rotated the spindle. Thank you

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02 Mar 2022 12:23 #236165 by cngbrick
Replied by cngbrick on topic Encoder Wiring

Its not connected to the encoder so I would leave it unconnected
at the 7I97 end

PCW, I always understood that the shield ground should be connected at least at one end. That is the recommendation from most encoder manufacturers such as Dynapar: www.dynapar.com/knowledge/encoder_issues...ring_best_practices/

Kylizer's picture shows his encoder wiring follows that recommended practice. I have a similar situation (7i97, single ended encoder) and connected the shield to 0 V terminal. Is there a particular reason not to follow this practice with the 7i97?

RT

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02 Mar 2022 13:48 #236170 by tommylight
Replied by tommylight on topic Encoder Wiring
It is very true that shielding should be wired only on one side, most of the time, there are for sure cases where it is required to have both sides wired but usually for high power stuff, not for signaling.
It is also very wrong to wire the shield to 0V or common, it has to be grounded to a ground plane that actually goes to outside the shop in the ground.
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