Mesa7i96s and Postep60-250?
- melayate
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26 Oct 2025 21:39 #337253
by melayate
Replied by melayate on topic Mesa7i96s and Postep60-250?
Thank you guys so much for the heated debate about power supply. I have 2 power supplies each powering 3 of the drives. it worked like a charm with Pokeys57 board. I am not getting any juice out of the drives to the stepper motors, I tried the 1K pullup resistor, no luck. I to use a 10kΩ pull-up resistor from each PoStep Pin 1 to Pin 9 (+5V) to ensure drivers default to disabled state. and still nothing. I really don't want to go back to Mach4 & Pokeys board. I am just hitting a wall!
Thank you!
Thank you!
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- langdons
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26 Oct 2025 23:21 - 26 Oct 2025 23:27 #337255
by langdons
Replied by langdons on topic Mesa7i96s and Postep60-250?
You have 6 motors, but only 3 axes?
How's that possible.
Are all your axes tandem?
The drivers should default to enabled, not disabled!
When you are testing, you want stuff to work (safety concerns notwithstanding).
It won't work if it's disabled!
How's that possible.
Are all your axes tandem?
The drivers should default to enabled, not disabled!
When you are testing, you want stuff to work (safety concerns notwithstanding).
It won't work if it's disabled!
Last edit: 26 Oct 2025 23:27 by langdons. Reason: Added answer.
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- tommylight
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26 Oct 2025 23:36 #337257
by tommylight
Replied by tommylight on topic Mesa7i96s and Postep60-250?
Take some pictures of the wiring and upload them here on the forum so we can have a look.
Do you have a DVM or even better an oscilloscope? Or a simple small LED?
You can use those to check if the drives get any signal on the inputs, easy to check by changing direction of the axis being checked as that should swing from 0 to ~3.3 or 5V.
Do you have a DVM or even better an oscilloscope? Or a simple small LED?
You can use those to check if the drives get any signal on the inputs, easy to check by changing direction of the axis being checked as that should swing from 0 to ~3.3 or 5V.
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- melayate
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27 Oct 2025 03:13 #337263
by melayate
Replied by melayate on topic Mesa7i96s and Postep60-250?
sorry for the confusion, i have 6 drives powered by 2 power supplies. each power supply is powering 3 drives. my machine setup is 5 axis with the X (gantry) has a tandem, total of 6 axis.
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- PCW
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27 Oct 2025 14:51 #337281
by PCW
Replied by PCW on topic Mesa7i96s and Postep60-250?
Did you check that you have 0V at the enables when LinuxCNC is on the power-on and EStop released state?
How are you checking motion? With normal homing setup (with home switches),
you will not be able to jog until the machine is homed.
If the enables are at 0V, anther sanity check to do is to jog in either direction
and check that the DIR pin changes polarity.
How are you checking motion? With normal homing setup (with home switches),
you will not be able to jog until the machine is homed.
If the enables are at 0V, anther sanity check to do is to jog in either direction
and check that the DIR pin changes polarity.
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