Need Help! New Chinese AC Servo Drive SDA-No movement with+-10VDC Dif Analog In

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28 Nov 2020 02:47 - 28 Nov 2020 02:49 #190481 by eighthaxis
Hello Fellow LinuxCNC users.
I am trying to get a couple of these new SDA Chinese AC Servo systems running and am pulling my hair out.
If anyone would be willing to review the manual and help point out where I am going wrong I would be greatly appreciative.
My setup is a Mesa 5i25/7i77 and I am trying to run the AC Drive with differential analog +-10VDC input.
I am using the 3.8Kw units on my 5 axis machining center. So far I have just been able to get them to power up and the encoders to work with LinuxCNC.
When the 7i77 sends the analog signal to the drive I get no movement.
There is no support for these units from the manufacture but they may be a good value to many builders as the build quality looks very good and the price is right. The manual isn't the best English translation.
I believe the problem to be strictly some programming parameters being the wrong values.
The file is too big to attach here so here is a download link:
SDA AC Servo Drive Manual
Thank you in advance to anyone even open to look at it. I will post again soon with the values I am running or should I say not running.
Last edit: 28 Nov 2020 02:49 by eighthaxis.

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28 Nov 2020 08:41 - 28 Nov 2020 08:51 #190494 by Aciera
I trust you have the basics setup:
DI1:Servo enabled SON;
attention : SON signal is controlled by
parameter
P0-06;
Default
low
level
SON_ON, high level SON_OFF;

[edit]
Before you go down the rabbit hole make sure all the electrical input signals you think are there are actually confirmed to be there by measurement.
Last edit: 28 Nov 2020 08:51 by Aciera.

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28 Nov 2020 15:11 #190520 by bevins
Can the motor shaft turn freely? If they are connected to axis can you move the axis by hand? If yes then you need to enable the drives.

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29 Nov 2020 00:40 - 29 Nov 2020 00:44 #190573 by eighthaxis
Here are the settings I am using right now.
Also I am attaching a pic of the Fn-26 Status state. If you look at the last digit the bar is low instead of high indicating the drive is disabled. I was only able to get it to enable once fooling with the P0-06 settings but it soon reverted for some reason.
I have tried DI1 in a a high and low state with no difference in effect.
The wiring is setup with a loop between AGND and AS-. I have also tried with and withou this loop with no difference.
It may be some Alarm setting I am missing but I am not sure.
Thanks for the help.
Attachments:
Last edit: 29 Nov 2020 00:44 by eighthaxis.

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29 Nov 2020 16:46 - 29 Nov 2020 16:52 #190613 by Aciera
So, you have an external 24V power supply with the +24V connected to terminal 18 and the 0V to terminal 10?

[edit]

first digit on the display is "-" so there seems to be no active alarm.

[edit2]

forget about the analog voltage input for now. First step is getting the drive enabled.
Last edit: 29 Nov 2020 16:52 by Aciera.

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29 Nov 2020 18:18 #190618 by eighthaxis
I agree it needs to be enabled first.
On a second note the one time I was able to get it to enable its still had no response from the analog input.
I have tried it with or without DI1 being high or low. I am connecting DI1(terminal number 10) to COM+(terminal number 18) to accomplish this.See pic
Attachments:

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29 Nov 2020 19:54 - 29 Nov 2020 19:54 #190625 by 0x2102
Hello eightaxis,

from your picture it looks like the servo is in torque mode. I haven't configured/tuned torque mode yet but maybe try changing it to speed mode first and see if it takes the analog input.

As always with analog servos, run them on a bench before installed on your machine. Maybe that seems obvious, but I wanted to point again.
Last edit: 29 Nov 2020 19:54 by 0x2102.

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29 Nov 2020 22:31 #190637 by eighthaxis
Thanks for the input I did think the same thing and tried speed mode to no avail.

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30 Nov 2020 06:35 #190652 by Aciera

I am connecting DI1(terminal number 10) to COM+(terminal number 18) to accomplish this


That is not correct. There needs to be a power supply (12-24V) between DI1 and COM1 with the positive connection to COM+ and the negative to DI1 as indicated on the schematic.

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30 Nov 2020 20:21 #190705 by eighthaxis
Thanks for the input Aciera you were right on that one!
I supplied 24VDC from an external power supply to terminals 10 and 18 and changed P0-06 to H000 and walla the drive is enabled.
The problem now is that it still is not physically responding to the external analog input. Fn-04 status indicator (Differential analog sample value) is at about 2060 but increases to 2360 when I apply 1.6VDC to the differential analog input(term. 19&20) so the drive is seeing the signal.
I also tried changing P0-04 to all 6 different control mode types so it not that value.
Getting closer any extra input is greatly appreciated.

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