Topics

1

Mach4 General Discussion / Modbus and VFD in Mach4

« on: July 12, 2015, 12:14:39 AM »

Hi all,

First time posting - sorry I am green.

I have a question about setting up communication between my VFD using Modbus in Mach 4, evaluation version.  I would like to get my VFD working before buying the lic.

FYI, I have no issues communication to my VFD using Mach3 or QModBus.  

Simply, I would like to understand what code needs to be placed into the "m3" LUA script to tell the spindle to run CW.  

This what I have tried:  mc.mcRegSetValue("modbus0/DIR0-0", 01)  

Let's assume that I configured the Modbus plug-in correctly.

Thanks for your help,  Rick

2

General Mach Discussion / Losing steps on the run. . .

« on: February 19, 2008, 12:26:27 AM »

Hi All,

I am two weeks new into this CNC stuff and I need a little help from my new friends.  My motors in all three axes are missing steps as I am moving along at 10 in/min.  I hear random chirps or step skips as I move along; sorry if I am not being clear with the proper vernacular.  And once in a while I get a burp and the motor stops turning as the counter on the Mach3 screen continues to go and then I’m off position by as much as ¼ inch. I discounted the motors so there is no load on them and I tuned and tuned and tuned with no avail.  I changed the pulse widths all the way up to +15. 

Here is some background information on my setup:
I am running MachX (2 on 3) on an IBM laptop with all the recommendations called out in the Art’s optimization file. When I run the driver test I see pure perfection at 25, 35, 45 . . . 100kHz.  BTW, I am plugged-in, not running off the battery; however I did try both setups.

I have a quality printer cable 3ft long running to my Gecko’s G201 with no BOB.  I have three AC/DC switcher power supplies made by GlobTec RT-3S150-24 each at 24V 6A. I am running little steppers made by Superior Electric Type MO62-CS-513 DCV 1.65, 4.7 amps. 200 steps/rev.  I built a Vicor AC 120V /DC 120V To DC/DC 5V with a 660 mF holdup capacitor to feed power to the Gecko’s opto’s and LPT ground.  Speaking of ground, I have tried many different configurations of grounding, the outputs of the power supplies, the Geckos, but not Gecko common to AC ground; I hear that could be costly.

Do you have any ideas guys and gals?  Gals as in girls not a unit of acceleration in the centimeter-gram-second system equal to 1 cm per second per second.  Sorry the geek in my just spilled out. 

Rick