Newbie converting a PM-728VT

All things related to the Centroid Acorn CNC Controller

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DesertRider
Posts: 17
Joined: Mon Nov 30, 2020 6:49 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 1116203993
Location: Phoenix, Az

Re: Newbie converting a PM-728VT

Post by DesertRider »

It was one of the NEMA23 motors (I have two NEMA 23s and one 34). While the x-axis motor was working well, the y axis would not respond to commands from Acorn. I could spin it with the Teknic MSP software, and it had the flashing green light; it wasn't a cable issue or Acorn issue becasue switching those around localized the pb to the motor. I downloaded the configuration of the other (working) motor, and uploaded it to the motor in question, and the engineer from Teknic walked me through the steps in the MSP software and after rebooting the system it worked. I frankly am not sure what made it worked but am glad it is fine now. Must point out the tech support person was genuinely very helpful.
DesertRider
Posts: 17
Joined: Mon Nov 30, 2020 6:49 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 1116203993
Location: Phoenix, Az

Re: Newbie converting a PM-728VT

Post by DesertRider »

martyscncgarage
Posts: 7134
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Newbie converting a PM-728VT

Post by martyscncgarage »

Something must have been misconfigured. But glad you got it going.
Hope you can share exactly how you have them wired. Seems as though some stumble in getting SDSK's going

Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
DesertRider
Posts: 17
Joined: Mon Nov 30, 2020 6:49 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No
CNC Control System Serial Number: 1116203993
Location: Phoenix, Az

Re: Newbie converting a PM-728VT

Post by DesertRider »

Great idea Marty, I will share here what I did thus far. I assume the Acorn board and its computer connection have successfully been bench tested. Before wiring Clearpath motors to the Acorn, one should set them up using Teknic's MSP setup software. You should download the Teknic user manual and read it, then follow along.

For power supply I used the factory IPC5 and power hub (the IPC5 only allows 2 motors, the power hub increases that to 4), and the factory cables. The Acorn power supply is limited in output, and the hub (as well as sundry bits and parts like contactor, proximity sensors etc) need a 24V input, so I replaced the acorn PS with a MeanWell DIN-rail mounted PS that has sufficient amps.
IMG_6834.JPG
The main setup is straightforward. First, decline "auto-tune" -- that will be done once the motors are running and are connected to the hardware of the mill. Just run it with "no load" to make sure it plays well with Acorn. Then configure the steps to 6400 and RAS to 16 ms.
MSP configure_small.png
Once the motors can be spun in MSP you can connect them to the Acorn. It is not necessary to disconnect the USB connection while the motors are connected to the Acorn. This point was helpfully clarified for me by a Teknic engineer (thank you Jon!) with whom I talked on the phone last Friday. The MSP scope and other diagnostics are designed to be used in real-time while the motor is working.

For the Acorn connection, I cut off the board-side (not the overmolded end) Molex pin. This way I connected the wires directly as in this photo:
Acorn wiring.png
For each motor the order is: 1=yellow, 2=brown, 3=orange, 4=red. The green wires from each motor get connected together to Acorn's Motor OK input. Each motor still has a white, a blue, and a black wire -- these get connected together to + 24V. For the real setup on the mill, I will use aviation style connectors; one needs only 6 pins (the 3 wires I just mentioned can be collapsed onto one pin), but using an 8-pin connector may be cleaner.

In the end it should look like this:

martyscncgarage
Posts: 7134
Joined: Tue Mar 28, 2017 12:01 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: Yes
Oak CNC controller: No
MPU11 & GPIO4D -w/ 3rd Party Drives: No
DC3IOB: No
CNC12: Yes
CNC11: Yes
CPU10 or CPU7: Yes
CNC Control System Serial Number: none
Location: Mesa, AZ

Re: Newbie converting a PM-728VT

Post by martyscncgarage »

Desert Rider,
Thanks so much for sharing your recipe! Did you use the Centroid Clearpath schematci?
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
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