Huanyang VFD speed display vs LinuxCNC speed display

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{HD}
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12 Apr 2017 05:08 - 12 Apr 2017 17:08 #91226 by {HD}

Huanyang VFD speed display vs LinuxCNC speed display was created by {HD}

I have my Huanyang VFD connected to LinuxCNC via a 232-485 adapter. I setup my configurations just like in this video:

(4:29 is the time in the video where both configuration files are on screen).

I can turn my spindle on and off and adjust the speed via LinuxCNC software but, the displayed speed in software is different than what is displayed on the VFD LCD.

I have tried "loadusr -Wn vfd hy_vfd -n vfd -d /dev/ttyUSB0 -p none -r 9600 -S 24000" but adding the "-S 24000" seems to change the P144 value of the VFD to 2400. However if I start the software then change the value of P144 back to 3000 it works both speed indicators match.

If I set -S 3000 then at software 1000rpm I get hardware 8000rpm.
If I set -S 24000 then at software 1000prm I get hardware 800rpm.
BUT again
If I set -S 24000 then change P144 back to 3000 then I get software 1000rpm hardware 1000rpm.

What do I need to change to get this to work by default I feel like something is just slightly off.

Last edit: 12 Apr 2017 17:08 by {HD}.

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{HD}
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12 Apr 2017 15:28 - 12 Apr 2017 15:29 #91251 by {HD}

Replied by {HD} on topic Huanyang VFD speed display vs LinuxCNC speed display

This is the source from hy_vfd.c that I found relevant to my situation.

hc_data->parameter = 144; // PD144 Rated Motor Rev (at 50 Hz)
        if (*haldata->rated_motor_rev != 0) {
            // user passed in motor max speed
            // we know motor max freq
            // write the VFD's P144 with "motor speed at 50 Hz"
            rpm_at_50hz = (*haldata->rated_motor_rev / *haldata->max_freq) * 50.0;
            hc_data->function = FUNCTION_WRITE;
            hc_data->data = (uint16_t)rpm_at_50hz;
            if ((retval = hy_comm(hc_param, hc_data)) != 0) {
                goto failed;
            }
            hc_data->function = FUNCTION_READ;
        }

	if ((retval = hy_comm(hc_param, hc_data)) != 0)
		goto failed;		
        rpm_at_50hz = hc_data->ret_data;
        *(haldata->rated_motor_rev) = (rpm_at_50hz / 50.0) * *haldata->max_freq;

	if (hc_param->debug) {
		printf("read_setup: read setup parameters - OK.\n");
	}

If you plug my #'s into the variables it seems like it should work. If I pass -S 24000 : 24000(rated motor rev) / 400(max freq) * 50 = 3000. But, 2400 is the value that gets pushed to my VFD.

Last edit: 12 Apr 2017 15:29 by {HD}.

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{HD}
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12 Apr 2017 17:06 #91260 by {HD}

Replied by {HD} on topic Huanyang VFD speed display vs LinuxCNC speed display

Well after screwing around for 2 days trying to get it to work. I decided to apply updates/upgrades. I was reluctant to do this because it meant I had to make a Ethernet cable to reach my CNC machine.

DON'T BE LAZY! APPLY THE UPDATES! THEY FIX THINGS!

I don't know what the issue was and the CODE I listed in the previous post was the 'updated' code but it now WORKS!

Problem solved.

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whoppa
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15 Dec 2019 23:47 #152701 by whoppa

Replied by whoppa on topic Huanyang VFD speed display vs LinuxCNC speed display

Wow I wish a few posts like this were put in a file somewhere for newbies,
Try this first!.. I spent about two weeks off and on trying to sort this issue before stumbling on to this post. Consulted several local experts, tried 3 different RS485 adaptors and many VFD settings, different wiring twisted pair, shielded cable, added grounds etc.Why is this sort post so hard to find.
I was not aware that a five minute update would fix the problem,
I was not even aware my linuxcnc was not the latest 2.7.14 version.
Great program but why is everything so secret squirrel?

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