Just Getting Started Have Servos Need Direction

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04 Dec 2019 03:40 #151942 by PCW
A resistive divider made with 2x 22 ohm resistors has an impedance of 11 Ohms so unless the differential input resistance of the drive is very low, one divider for STEP- and DIR- is likely OK

+5V --> R1 -->2.5V tap --> R2 --> GND

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04 Dec 2019 04:12 #151946 by JuniorC
I did a quick add in of the resistors to the BOB diagram. PCW, is what you were describing.

Sorry about the draftsmanship. I by no means a electrical engineer. I didn't draw in the leaders to PUL- and DIR- on the Y and Z axis. It's sloppy enough. Hope you can make heads or tails of what I've added. And most of all I hope this is was you're talking about. I do appreciate your all's time.

Thanks again,
JuniorC
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04 Dec 2019 04:34 #151949 by JuniorC
Sorry PCW, I believe my diagram is a little off from what you're trying to explain to me. Bear with me I'm weak on the electrical side. I'm a industrial maintenance machinist by trade.

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04 Dec 2019 05:51 #151951 by JuniorC
PCW, I made another diagram. With only one drive so it wasn't such a mess. Is this a little closer to what you're talking about?

Thanks again,
JuniorC
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04 Dec 2019 10:46 - 04 Dec 2019 10:49 #151968 by PCW
No, the resistor connections are:

+5V --> R1 --> R2 --> GND

With the junction of R1 and R2 being your 2.5V tap
This2.5V tap goes to STEP- and DIR- and the BOBs
STEP and DIR outputs go to STEP+ and DIR+
directly. That is, the resistors do not connect to any
BOB signals at all (other than 5V power and GND)
Last edit: 04 Dec 2019 10:49 by PCW.

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04 Dec 2019 12:57 #151985 by JuniorC
I understand resistors configuration and the tap voltage. I want to make sure that I'm understand you correctly on the inputs to outputs. The BOB pulse- and direction- to the DRIVES step+ and direction+ ?

Thanks for your time and help
JuniorC

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