Encoder Feedback
14 Jan 2021 18:05 - 14 Jan 2021 18:23 #195352
by Hamel2020
Replied by Hamel2020 on topic Encoder Feedback
No ... they do not have a common ground
Last edit: 14 Jan 2021 18:23 by Hamel2020.
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14 Jan 2021 18:20 #195354
by Hamel2020
Replied by Hamel2020 on topic Encoder Feedback
Well, the detla drive has a ground , but mesa cards are not ...
do they have to have a common ground ?
do they have to have a common ground ?
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14 Jan 2021 20:37 #195366
by PCW
Replied by PCW on topic Encoder Feedback
Yes, the common mode for the encoder and step/dir signals must be established
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15 Jan 2021 15:23 #195442
by Flyer007
Replied by Flyer007 on topic Encoder Feedback
I'm curious, PCW, your saying tie the gnd from mesa to the AC gnd? I'm in final planning for electronics now and have the meanwell 24v psu gnd to the AC star ground which combines, source, drivers, VFD, 120v power to computer and monitor. I have the 7i76e just connected to the 24v+, 24v-.
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15 Jan 2021 17:56 #195470
by PCW
Replied by PCW on topic Encoder Feedback
Where you have encoder connections or high speed step/dir inputs using
differential transmitters and receivers rather than optocouplers. the Mesa card
ground must return to the same ground that the drive inputs/outputs are
connected to. This establishes the common mode for the receivers on
the mesa card and on the drive.
differential transmitters and receivers rather than optocouplers. the Mesa card
ground must return to the same ground that the drive inputs/outputs are
connected to. This establishes the common mode for the receivers on
the mesa card and on the drive.
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16 Jan 2021 00:09 #195496
by Hamel2020
Replied by Hamel2020 on topic Encoder Feedback
Yes , Peter .. you are right ... cause i found two issues :
1. GND of servo drive and mesa as you said .
2. There was an issue with scale also ....
I will make full drawing for connection , in case someone need it ..
but i did something with scale ,( it works ) but I'm not sure if it is correct or no ..
( is use 3000 as STEP_SCALE , then i used 300 for Encoder_Scale )
1. GND of servo drive and mesa as you said .
2. There was an issue with scale also ....
I will make full drawing for connection , in case someone need it ..
but i did something with scale ,( it works ) but I'm not sure if it is correct or no ..
( is use 3000 as STEP_SCALE , then i used 300 for Encoder_Scale )
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16 Jan 2021 20:35 #195574
by andypugh
Replied by andypugh on topic Encoder Feedback
I think we need to be a bit more careful with the terminology here.
The 0V reference for GPIO signals needs to be common. This is often called GND but isn't necessarily the same as the machine frame safety ground.
But a 5V signal is only at 5V relative to something else, and both sides of the system using that 5V signal need to be comparing to the same other thing.
The 0V reference for GPIO signals needs to be common. This is often called GND but isn't necessarily the same as the machine frame safety ground.
But a 5V signal is only at 5V relative to something else, and both sides of the system using that 5V signal need to be comparing to the same other thing.
The following user(s) said Thank You: JackW327
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