the VFD manual that you gave a link to is inconsistent in what it calls the analog input "common" terminal. This makes me think that perhaps the VFD is not configured correctly, or there is something in the wiring between.įor kicks, command the spindle to 4000 RPM again in mach and measure the voltage AT THE VFD between the "VC" and "AV0" terminals. That said, if the PMDX-110 is outputting 9.82 or 9.89 volts to the VFD, AND presuming that the VFD is programmed so that 10V in results in 4000 RPM of the spindle (a big *if*), then you should be getting (9.8/10)*4000 = 3920 RPM.įrom your graph it looks like you are getting somewhere around 3100 or 3200 RPM. I am about to exceed my knowledge of VFDs. Motor Information (difficult to see clearly) Wires and the switch settings at PMDX-110 can be seen in the attached photo of the board. We used LinuxCNC to run the mill for a couple of years and due to a litany little problems with LunuxCNC we decided to shift to Mach3 after a fresh installation of Windows XP.Ĭ300 VFD setting for Smithy 1240 (Smithy)Ĭonnections at the C300 from the PMCX-110Ĭable colors change due to loom make up leading from C 300 to PMDX-110. We gave Mach a quick try but did not get good results. A prior owner loaded Windows XP on the computer along with Mach3. The computer had a dual boot Windows XP and Ubuntu operating system with LinuxCNC running the mill. When we purchased the machine the original EZTROL system was abandoned in favor of a desktop computer using the printer port and a cable to the PMDX-110. We removed the linearity.dat file from about four places in the Mach3. The worksheet from the PMDX website and a note on a similar thread really helped. The maximum speed should be 4000 rpm and we are producing about 3500 or less. The actual and commanded speed (using an s command in a program or in the MDI tab) of the spindle is different. An m3 or m4 code both result in forward rotation of the spindle. The central problem is controlling the spindle. The limit switches and homing are working as expected.
The X,Y and Z axes seem to be working fine after using the auto setup found in Mach3. I think we are close but just do not have the technical knowledge to get the project finished. I am having a time trying to learn all the technical aspects of the electronics and what the parameters should be in the Mach3 software. Briefly, the spindle does not operate correctly and we seek advice from someone with more expertise. We would very much appreciate your assistance in getting our Smithy 1240 running with Mach3.
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