Acorn Analog out to Precision Matthews PM-30MV Spindle

[WVDualsport]

I have searched this topic and found conflicting information, incomplete information, and been left with the same questions.

Has anyone connected the 0-10v Analog out and Analog GRN from the Acorn board to the PM Spindle POT? Does it work? I'm in the process of doing a complete conversion on a new machine and want to run all the necessary circuits now.

If it's as simple as that great. If it's not as simple as that what else is necessary?

Brand new PM-30.
Clearpath SDSK's
Arizona Video 99 CNC conversion kit for the Nema 34's

Thanks.

[carbuthn]

You may want to check out one of Franco's video for setting up a PM-25 mill, it also includes a schematic also.

https://youtu.be/-h4k-9qlTHo video.

Below the video is the link for the schematic using a KBSI-240D.

I think the PM-30 uses a 0 to 5 volt signal also.

Hope it helps,
Chuck

[cnckeith]

don't hook it up to the pot.
is this a single phase AC spindle motor? or a DC motor PWM control? or?


other Precision Matthews posts

viewtopic.php?f=60&t=933&p=4229&hilit=727#p4229


viewtopic.php?f=57&t=3376

[WVDualsport]

Here is the previous post from this forum that lead to the above question. ?? Which lead me to wonder what was happening to the power already being supplied to the POT from the Milling Machine AND How the Acorn board was going to override the physical Forward/Reverse switch on the panel. I admit that most of this is a bit over my head, so I ask for advise.

"Re: PM-25MV Spindle control with acorn
Post by Centroid_Tech » Wed Jun 20, 2018 9:27 am

The COM terminal for the analog speed request is the same COM as your inputs which is 24V GND. I am assuming that there are 3 connections to your pot, +V, GND, and wiper. If so, you should be able to connect the GND to COM and the wiper to AOUT. Unfortunately, I do not know what the common is for the other inputs. The ON/OFF switch will be an issue because we only have a SpinFWD and SpinREV terminals. That just means that it will always have to be on, which shouldn’t be an issue because until the controller sees either the SpinFWD or the SpinREV signals, the spindle motor shouldn’t spin. Unfortunately, without a manual from that controller, I have no idea whether or not you will have an isolation issue like with the DC spindle motor controller.

The ACORN will supply a 0-10VDC analog speed voltage based on the speed that is requested. For example, let's say that you have the Maximum Spindle Speed set to 3000 rpm. When you command a speed of 1500rpm in your program, the ACORN will put out 5VDC and turn the SpinFWD output on. If you command a speed of -750rpm, the ACORN will put out 2.5VDC and turn the SpinREV output on. The spindle isn't a requirement unless you are trying to rigid tap or thread. If you install a spindle encoder, it will be setup so that the spindle speed that is displayed on the main page of the CNC12 software is the actual spindle speed from that spindle encoder."

[cnckeith]

is this a single phase AC spindle motor? or a DC motor PWM control? or?

[Dave_C]

"Extremely Reliable, Brushless DC Variable Speed Motor Included Standard"

Taken from their web page!

Dave C.

[WVDualsport]

From their page:

2 HP (1.5 kW) brushless dc motor, 220 Vac single phase power
Quiet belt drive, no gears
Variable spindle speed from 50 to 3000 rpm

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[swissi]

This is how I wired my PM-25MV to the Acorn, I assume the PM-30MV is similar. Works great for me.

You will need the KBSI-240D board which allows to adjust the 0-10V from the Acorn to 0-5V the PM controller needs. I got mine very cheap used on eBay.

The wire colors in the schematic match the wire colors from the Speed and Direction connectors on my PM controller.

BTW the schematic that Franco showed in his video was this one attached here.

PM25-Schematics2.pdf

(1.29 MiB) Downloaded 135 times

-swissi

[WVDualsport]

Thank you Swissi for the information and the schematic. I'll order the isolator.

The information and instruction provided in the previous thread that I referenced appears to be incorrect and could cause issue with the PM benchtop mills if followed.