MDI spindle speed is not correct.

[Malachilee]

Hi tblough,
Sorry, I misunderstood what you were saying. When I searched "signal isolators" in the Centroid installation manual, I was directed to the page about snubbers. I'm not sure if a snubber and a capacitor are the same things, but I installed what I thought was a snubber; it says 0.1uF-120ohms, which is what the Centroid manual shows as a snubber.
Anyway, I don't think I said in this post, but I'm trying to use a Dyn4 servo driver and motor for this spindle setup. I'm not sure if that makes a difference because it's not a VFD.

Something like this? (amazon link)
https://a.co/d/74rwy9o

[cnckeith]

what make model VFD are you using?
link to manual?

[Malachilee]

This is a link to the manual for the driver I'm using.
Model number: DYN4-H01A2-00

https://www.dmm-tech.com/Files/DYN4MS-ZM7-A10A.pdf

[tblough]

That is most definitely not a VFD. You might try contacting DMM.

[suntravel]

There are some threads here with problems using DMM servos as spindle drive, but nobody posted a solution...

Uwe

[Malachilee]

Hi Uwe,

I have been searching through the forum to find someone who has successfully set up the DMM motor and driver as a spindle with the Acorn. I found two people, Pete Rondeau and Bhouin, who claim to have done it, but they haven't posted any diagrams or settings. Before purchasing from DMM, I emailed them to ask if their motor and driver would work as a spindle with the Acorn, and they said yes. They even sent me a diagram, which seemed to work, but I am now facing an issue where the Acorn doesn't turn on the spindle until about 4.2V. I can't afford to buy another driver and motor, so I have to figure this out. It also seems like I will need to add some code to the PLC that CNCSNW created to prevent the Dyn4 driver from getting an overvoltage alarm, but I need to fix this issue first.

;==============================================================================
StandardSpindleStage
;==============================================================================
IF (SpindleEnableOut_M || SpinStart_M ) && !SpinStop_M
THEN SET SpindleEnableOut_M
IF !((SpindleEnableOut_M || SpinStart_M ) && !SpinStop_M) THEN RST SpindleEnableOut_M
IF SpindleEnableOut_M THEN SET VFDEnable_O, RST VFDDisableTimer
IF SpindleEnableOut_M && !SpindleDirectionOut_M && SpindleBrakeTimer THEN SET SpinFWD
IF SpindleEnableOut_M && SpindleDirectionOut_M && SpindleBrakeTimer THEN SET SpinREV, SET VFDDirection_O
IF !SpindleEnableOut_M THEN (DoSpindleStop), VFDDisableTimer = 2000, SET VFDDisableTimer
IF VFDDisableTimer THEN RST VFDEnable_O, RST SpinFWD, RST SpinREV, RST VFDDirection_O

[Malachilee]

That is most definitely not a VFD. You might try contacting DMM.

I have been working with DMM. It looks like their driver is working correctly, at least with this issue. 0-10V from a power supply runs the spindle through all the RPM range, just not with the 0-10V from the Acorn analog output.

[tblough]

Then we're back to trying a signal isolator

[Malachilee]

Hi tblough,

I will give it a try, and I appreciate you taking the time to help me out. I searched for a video on Acorn and signal isolators, and I came across a video by a person named Franco, who demonstrated the KBS1-240D signal isolator. Unfortunately, this product is currently out of stock. Therefore, I attempted to find a comparable product on Amazon that I could test quickly and inexpensively. This is what I discovered. Although I am not very familiar with this type of equipment, it seems to be quite similar.
Thanks again


(Amazon Link)
https://a.co/d/dwdXrIB

[suntravel]

Here is one in the USA

https://www.ebay.de/itm/195612559122?ch ... IkQAvD_BwE

Uwe