How to connect Sir88 to mesa board and linuxcnc
08 Sep 2020 20:14 #181314
by andypugh
No, it isn't safe to assume that. For example the HuangYang VFDs have their own not-quite-modbus protocol.
But LinuxNC has quite a variety of RS485 drivers, so there might be a dedicated one. And then, it might be true modbus in which case there are options.
I do think that a Mesa-Modbus component would be immensely useful. But for a router waiting for spindle-at speed is probably enough. (on my machine, when I fit the high-speed head and VFD the update rate drops to about 5 seconds because of noise in the link. But that is OK because it waits for spindle-at-speed before the next G1 move,
I am using: www.amazon.co.uk/gp/product/B075818Z6H which is good for trouble-shooting as it flashes. A lot. But I have also bought (but not tested) www.amazon.co.uk/gp/product/B082KKG55T to see if it is more noise tolerant. And also because it is a little shorter and less flashy.
I bought the first one as it had more wires, but the one that actually arrived only had 4 wires. (data and USB power)
Replied by andypugh on topic How to connect Sir88 to mesa board and linuxcnc
3) how did you control the VFD of the spindles? the machine I have to deal with, has VFD with RS-485 port. Is it safe to assume that it is Modbus?
No, it isn't safe to assume that. For example the HuangYang VFDs have their own not-quite-modbus protocol.
But LinuxNC has quite a variety of RS485 drivers, so there might be a dedicated one. And then, it might be true modbus in which case there are options.
I do think that a Mesa-Modbus component would be immensely useful. But for a router waiting for spindle-at speed is probably enough. (on my machine, when I fit the high-speed head and VFD the update rate drops to about 5 seconds because of noise in the link. But that is OK because it waits for spindle-at-speed before the next G1 move,
I am using: www.amazon.co.uk/gp/product/B075818Z6H which is good for trouble-shooting as it flashes. A lot. But I have also bought (but not tested) www.amazon.co.uk/gp/product/B082KKG55T to see if it is more noise tolerant. And also because it is a little shorter and less flashy.
I bought the first one as it had more wires, but the one that actually arrived only had 4 wires. (data and USB power)
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- Mike_Eitel
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09 Sep 2020 07:31 #181387
by Mike_Eitel
Replied by Mike_Eitel on topic How to connect Sir88 to mesa board and linuxcnc
@Andy
Just a question: Have you implemented a bus termination of 120 ohm?
Just a question: Have you implemented a bus termination of 120 ohm?
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09 Sep 2020 07:43 #181391
by andypugh
Replied by andypugh on topic How to connect Sir88 to mesa board and linuxcnc
I haven't. I suppose it's worth a try.
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09 Sep 2020 08:22 #181395
by Mike_Eitel
Replied by Mike_Eitel on topic How to connect Sir88 to mesa board and linuxcnc
I would bet some beer on that. 
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09 Sep 2020 09:00 #181402
by aleksamc
Replied by aleksamc on topic How to connect Sir88 to mesa board and linuxcnc
Currently i havn't run that project yet.
But if I will run it, I will use mesa cards to control servodrives, freaquency drive and I/O.
All sir88 I will remove to trash, because they use their fabrication closed protocol (possibly RS485 (ANSI x 3.28 - 2.5 A4)). If you are programmer and you know how to use it, you are welcome.
Servodrives are use analog control, that's why I prefere 7i77.
But if I will run it, I will use mesa cards to control servodrives, freaquency drive and I/O.
All sir88 I will remove to trash, because they use their fabrication closed protocol (possibly RS485 (ANSI x 3.28 - 2.5 A4)). If you are programmer and you know how to use it, you are welcome.
Servodrives are use analog control, that's why I prefere 7i77.
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11 Sep 2020 20:44 #181792
by viesturs.lacis
Replied by viesturs.lacis on topic How to connect Sir88 to mesa board and linuxcnc
Having lots of possibilities on that serial communication does not make it easy...
Anyway, I have 2 pictures:
One is the dataplate on top of the VFD (on the actual drive I need to control):
www.picpasteplus.com/v.php?i=5e1012dce1
The other one is front panel of a very similar VFD (manufacturer is the same, but I do not see RS-485 port in this picture, probably because this unit is older) from that other machine I did a retrofit few years ago:
www.picpasteplus.com/v.php?i=d028275684
Since it says it is made in UK, I was hoping that Andy might know something more about them. I was not agile enough to find a manual for them.
And then I have a question about recommended way to hook up servo drives. They are driven with analog signal. I have 7i48 for that purpose. I am not sure, how to set up HAL connections. Since servodrive are closing PID loop, I feel like I should skip PID modules in HAL, but am not sure if that is good idea. I would appreciate any suggestions.
Anyway, I have 2 pictures:
One is the dataplate on top of the VFD (on the actual drive I need to control):
www.picpasteplus.com/v.php?i=5e1012dce1
The other one is front panel of a very similar VFD (manufacturer is the same, but I do not see RS-485 port in this picture, probably because this unit is older) from that other machine I did a retrofit few years ago:
www.picpasteplus.com/v.php?i=d028275684
Since it says it is made in UK, I was hoping that Andy might know something more about them. I was not agile enough to find a manual for them.
And then I have a question about recommended way to hook up servo drives. They are driven with analog signal. I have 7i48 for that purpose. I am not sure, how to set up HAL connections. Since servodrive are closing PID loop, I feel like I should skip PID modules in HAL, but am not sure if that is good idea. I would appreciate any suggestions.
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11 Sep 2020 23:02 #181808
by PCW
Replied by PCW on topic How to connect Sir88 to mesa board and linuxcnc
The HAL PID modules are necessary because LinuxCNC is closing the
position loop (the drive is closing the torque and velocity loops)
position loop (the drive is closing the torque and velocity loops)
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