Denford Mirac 8 position tool changer wiring

[martyscncgarage]

Thank you for your patience in trying to help me with this.

Windows but i usually air lock my CNC computers and transfer files over USB to the office computer (Windows also), maybe this is causing the file issue. I connected the PC running the machine directly to the internet and have uploaded the report, hopefully it works now.

That one is good. I'm going to update the others in your posts.
Marty

[martyscncgarage]

Tomb
I looked at your report
Parameter 830=3 not 8
It also looks like you do not have parameters 831-846 set correctly. (REQUIRED)

When you rotate your turret, say rotate it to tool manually with the CTRL ALT F function and reverse it against EACH tool position.
Notate your ToolTurretSynBit 1, 2, 3, 4 states in the diagnostic screen. You have to build a truth table for your turret. Please re-read pages 3-4 of the Acorn Gray-Code with 2 Motor Output Tool Turret Instructions.

Let us know if you have questions about this.
Right now you have some arbitrary numbers like 14 through 7 for parameters 831-838

[tomb]

Tomb
I looked at your report
Parameter 830=3 not 8
It also looks like you do not have parameters 831-846 set correctly. (REQUIRED)

When you rotate your turret, say rotate it to tool manually with the CTRL ALT F function and reverse it against EACH tool position.
Notate your ToolTurretSynBit 1, 2, 3, 4 states in the diagnostic screen. You have to build a truth table for your turret. Please re-read pages 3-4 of the Acorn Gray-Code with 2 Motor Output Tool Turret Instructions.

Let us know if you have questions about this.
Right now you have some arbitrary numbers like 14 through 7 for parameters 831-838

Hi Marty

Thank you for looking at that, classic case of trying to run before you can walk i think.

Been off ill for a couple of days so haven't had a chance to put all my time into it, progress has been made but another issue has arisen (The final hurdle i hope!)

Done my truth table

And the turret is working "as such", if i call a tool, the turret does rotate and finds it but this leads on to my final problem, it doesn't reverse.

It just sits on "waiting for dwell time".

I'm hoping it is not the VFD, not being able to switch fast enough into reverse as that will be a problem (I have the acceleration and de-acceleration times set on the VFD to 0.1 seconds to reduce any delays). I will double check the optical relay is trying to trigger at least tomorrow by looking it (need an extra pair if hands), i know it works if i force the relay on manually so it is wired correctly for reverse.

Any ideas? i'll be working on it tomorrow as it's a running machine once i iron this last problem out.

[tomb]

So i think i've found the problem but no idea how to fix it.

The Forward optical relay turns on, turret meets the truth table and triggers the reverse relay but the forward relay is not turning off meaning the turret just sits there until the relays time out. (Please see attached video)

Optical relay 2 is Forward turret
Optical relay 3 is Reverse turret

Most recent report attached.

Thoughts?

[Upnorth]

Fastest and easiest way to fix it is to get Centroid to edit your PLC. I had my PLC close to done and they tweaked it to make it work.

If you are wanting to do the fix yourself I completely understand. Editing a PLC is a good skill to pick up. You can look through the PLC and probably figure out the exact problem and change a couple of lines.

[cncsnw]

Code: Select all

RotateToolTurret     IS OUT2
ReverseToolTurret    IS OUT3

These are not "forward" and "reverse" outputs. These are "run" and "direction" outputs.

To use them as intended, you need to connect the N.O. output of the OUT2 relay to the common of the OUT3 relay; then connect the N.C. output of the OUT3 relay to the VFD run-forward input, and the N.O. output of the OUT3 relay to the VFD run-reverse input.

[tomb]

Code: Select all

RotateToolTurret     IS OUT2
ReverseToolTurret    IS OUT3

These are not "forward" and "reverse" outputs. These are "run" and "direction" outputs.

To use them as intended, you need to connect the N.O. output of the OUT2 relay to the common of the OUT3 relay; then connect the N.C. output of the OUT3 relay to the VFD run-forward input, and the N.O. output of the OUT3 relay to the VFD run-reverse input.

Thank you for explaining that, very helpful! Just to double check i've got it correct i've done a quick drawing (If you could even call it that). Would you say that is correct?

[tomb]

It does help when you wire it in correctly...

[martyscncgarage]

Great! You might want to cut the reverse time to just a smidge after locking against the pawl.
Congratulations.
Please, once your system is working, post a report and how you used a VFD, which VFD, what parameters, and post the Centroid schematic used with any changes.

You'll be helping the next Denfird orac user
Marty

[tomb]

Thank you Marty, your help has been appreciated.

I took 1.5 seconds out the reverse, works better.

Hopefully this thread has every stupid question asked by me already so the next guy has it to hand but i will also do a write up with my photos to finish it off.

Considering I've never even wired a relay in before this its been a good project to expand my electronics knowledge all in all.