New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

All things related to the Centroid Acorn CNC Controller

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brittfussel
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by brittfussel »

Marty

Can you post the model numbers for the ClearPath servo motors you are using? I'm particularly interested in the one you are using for the Z-axis.

I looked through the posts in this thread and did not see them. But then again, I did not read every post. If you already made them public just let me know and I'll look through this thread in more detail.

Thank you.


Britt
martyscncgarage
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by martyscncgarage »

brittfussel wrote: Thu Mar 18, 2021 12:12 pm Marty

Can you post the model numbers for the ClearPath servo motors you are using? I'm particularly interested in the one you are using for the Z-axis.

I looked through the posts in this thread and did not see them. But then again, I did not read every post. If you already made them public just let me know and I'll look through this thread in more detail.

Thank you.


Britt
Hi Britt, go back to my very first post in this thread. I just uploaded a copy of my receipt with the part numbers.
Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
brittfussel
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by brittfussel »

Marty

Sorry. I missed that when I first starting looking at this thread. I'm in the process of converting my mill over to Teknic ClearPath servo motors. I was motivated by struggling with missed steps on my Z-axis and your recent project on YouTube.

Thank you.

Britt
martyscncgarage
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by martyscncgarage »

brittfussel wrote: Thu Mar 18, 2021 12:34 pm Marty

Sorry. I missed that when I first starting looking at this thread. I'm in the process of converting my mill over to Teknic ClearPath servo motors. I was motivated by struggling with missed steps on my Z-axis and your recent project on YouTube.

Thank you.

Britt
If you are using Clearpath, you shouldn't be struggling with Missed Steps.
Start a new thread on the forum and explain your situation. Follow this post:
viewtopic.php?f=20&t=383

Moving forward, if I do anymore builds with Clearpath, I will use C86ACCP from CNC4PC. It has been reviewed by Teknic Engineers and approved for use with Clearpath without the need for resistors. CNC4PC.com should have the new C86ACCP with terminal blocks in stock in a few weeks.

Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
tkbot47
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by tkbot47 »

martyscncgarage wrote: Thu Mar 18, 2021 12:37 pm
brittfussel wrote: Thu Mar 18, 2021 12:34 pm Marty

Sorry. I missed that when I first starting looking at this thread. I'm in the process of converting my mill over to Teknic ClearPath servo motors. I was motivated by struggling with missed steps on my Z-axis and your recent project on YouTube.

Thank you.

Britt
If you are using Clearpath, you shouldn't be struggling with Missed Steps.
Start a new thread on the forum and explain your situation. Follow this post:
viewtopic.php?f=20&t=383

Moving forward, if I do anymore builds with Clearpath, I will use C86ACCP from CNC4PC. It has been reviewed by Teknic Engineers and approved for use with Clearpath without the need for resistors. CNC4PC.com should have the new C86ACCP with terminal blocks in stock in a few weeks.

Marty
Marty,

I'm curious....earlier in this post it was stated that the C86ACCP board had resistors already built in for the S/D pullup, so no external ones were needed. Centroid has stated that 100 ohm with 5v was preferred. Do you know if that's what CNC4PC is using on their latest gen 2 board?
martyscncgarage
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by martyscncgarage »

Teknic Engineers reviewed C86ACCP V2.0 and approved it saying it was adequate for use with their cables
Marty
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
carboncymbal
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by carboncymbal »

tkbot47 wrote: Mon Mar 22, 2021 3:07 pm
martyscncgarage wrote: Thu Mar 18, 2021 12:37 pm
brittfussel wrote: Thu Mar 18, 2021 12:34 pm Marty

Sorry. I missed that when I first starting looking at this thread. I'm in the process of converting my mill over to Teknic ClearPath servo motors. I was motivated by struggling with missed steps on my Z-axis and your recent project on YouTube.

Thank you.

Britt
If you are using Clearpath, you shouldn't be struggling with Missed Steps.
Start a new thread on the forum and explain your situation. Follow this post:
viewtopic.php?f=20&t=383

Moving forward, if I do anymore builds with Clearpath, I will use C86ACCP from CNC4PC. It has been reviewed by Teknic Engineers and approved for use with Clearpath without the need for resistors. CNC4PC.com should have the new C86ACCP with terminal blocks in stock in a few weeks.

Marty
Marty,

I'm curious....earlier in this post it was stated that the C86ACCP board had resistors already built in for the S/D pullup, so no external ones were needed. Centroid has stated that 100 ohm with 5v was preferred. Do you know if that's what CNC4PC is using on their latest gen 2 board?

I believe it is providing 5v with 100 ohm pull up resistors.
Akn99
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by Akn99 »

Was there any follow on to this suggestion to tie the e-stop contactor to the input of the IPC-5 - on the face of it this seems to make sense, and the 24V backup voltage would still allow the drive logic to keep the location?
martyscncgarage
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by martyscncgarage »

Akn99 wrote: Thu Mar 25, 2021 4:59 pm Was there any follow on to this suggestion to tie the e-stop contactor to the input of the IPC-5 - on the face of it this seems to make sense, and the 24V backup voltage would still allow the drive logic to keep the location?
I am unsure why you would want to power off the IPC-5 vs. just disconnect the DC voltage via the Estop contactor to the Power4-Hub?
The manual seems to indicate either is fine.
https://www.teknic.com/files/downloads/ ... manual.pdf
Reminder, for support please follow this post: viewtopic.php?f=20&t=383
We can't "SEE" what you see...
Mesa, AZ
carboncymbal
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Re: New Build: SYIL X4 CNC Mill, Clearpath SDSK, C86ACCP & Centroid Acorn

Post by carboncymbal »

martyscncgarage wrote: Thu Mar 25, 2021 5:05 pm
Akn99 wrote: Thu Mar 25, 2021 4:59 pm Was there any follow on to this suggestion to tie the e-stop contactor to the input of the IPC-5 - on the face of it this seems to make sense, and the 24V backup voltage would still allow the drive logic to keep the location?
I am unsure why you would want to power off the IPC-5 vs. just disconnect the DC voltage via the Estop contactor to the Power4-Hub?
The manual seems to indicate either is fine.
https://www.teknic.com/files/downloads/ ... manual.pdf
Marty,

I don't agree that having a E-stop contactor between the IPC5 and Power4-hub is appropriate. The IPC-5 provides circuitry to handle regenerative energy produced when a moving mass is driving the servos. Without this place to dump the energy in an E-stop situation I believe there is a risk of damaging the clear path drive electronics due to an overvoltage. the Power-4 hub has no means of handling this excess either (when not connected to the IPC-5).

Here is a scenario. You start a cut but the code is driving the machine in an unsafe way. You slam the E-stop button while the machine is still in motion. Your enable signal is removed so the motors are now free-wheeling, being driven by the mass of the machine as it decelerates. With the servos now functioning as generators, and you have disconnected the IPC-5, where does that energy go?

So, in this case its possible that an E-stop damages the servos. You might get away with a 100 e-stops without any issue, but sometime you may have a high velocity move during an E-stop and it could fry your servo.

Additionally, I'm not sure I see a real-world advantage to disconnecting the DC line vs AC. The only *potential* benefit I see is that you would have a slightly more rapid removal of power since removing the power from the AC side still leaves charged capacitors in the IPC-5. However in an E-stop scenario the motors should instantly stop commanding movement due to both ACORN halting step/dir signals and the loss of the enable signal. (in my case, a guided contact relay provides the enable signal, so even a malfunction on ACORN won't cause motors to continue to drive).

I'm just not sure I see any compelling reason to disconnect DC. I believe the practices of disconnecting DC power from a servo is commonly discouraged by other servo manufacturers due to regenerated energy. I don't see a compelling reason to take even a small risk to the hardware if it provides no advantages.

Finally, I don't see where in the IPC manual it suggests that switching the DC side is appropriate. There is a section in the manual about connecting and disconnecting loads, but I believe that is about the sequence of steps you need to take before changing wiring, not a bulleted list of suitable techniques. Those bullets should really be numbers, not bullets I think. If anything the manual says that the AC side must be turned off BEFORE disconnecting the DC side.

If one were to interpret that manual as a list of approved means of disconnection, rather than a sequence, one would also have to interpret that the step "Remove AC Power from supply" as a single action is an approved method of connecting the IPC-5 to a load, which wouldn't make any sense. This illustrates to me that this section of the manual is a SEQUENCE of actions to be taken, not a list of single steps to be selected from.
IPC-5 Disconnect.PNG
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