8i20 with 7i77/7i74 combo
22 Nov 2017 14:29 #102186
by andypugh
Replied by andypugh on topic 8i20 with 7i77/7i74 combo
STMBL would be another very good option, except that availability is patchy and the documentation is fragmented and incomplete.
If you can get one and figure it out it is great (I do have one) as it plugs straight into Mesa smart-serial and takes position commands from motion. HAL is as simple as:
net x-pos axis.0.motor-pos-cmd => hm2_5i25.0.stbl.0.0.pos-cmd
net x-fb axis.0.motor-pos-fb <= hm2_5i25.0.stbl.0.0.pos-fb.
Does your budget run to Granite Devices drives?
If you can get one and figure it out it is great (I do have one) as it plugs straight into Mesa smart-serial and takes position commands from motion. HAL is as simple as:
net x-pos axis.0.motor-pos-cmd => hm2_5i25.0.stbl.0.0.pos-cmd
net x-fb axis.0.motor-pos-fb <= hm2_5i25.0.stbl.0.0.pos-fb.
Does your budget run to Granite Devices drives?
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22 Nov 2017 14:46 - 22 Nov 2017 14:49 #102188
by bevins
Replied by bevins on topic 8i20 with 7i77/7i74 combo
I'll look into STMBL, looks cool if they are available. If not, couold possibly do a run of pc boards.
Granite devices only go up to 1.5kw, and at the same price as original drives or close..... 1,000.00 US.
/EDIT not actually 1000, more close to 600.00, still not in line with the project.
Granite devices only go up to 1.5kw, and at the same price as original drives or close..... 1,000.00 US.
/EDIT not actually 1000, more close to 600.00, still not in line with the project.
Last edit: 22 Nov 2017 14:49 by bevins.
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22 Nov 2017 15:59 - 22 Nov 2017 16:04 #102191
by PCW
Replied by PCW on topic 8i20 with 7i77/7i74 combo
Mesa should have more 8I20s available in about 2 weeks
We have had a part kit waiting for the 3 phase bridge chips for months
(Onsemi took over Fairchild and some Fairchild parts had almost year lead times)
We have had a part kit waiting for the 3 phase bridge chips for months
(Onsemi took over Fairchild and some Fairchild parts had almost year lead times)
Last edit: 22 Nov 2017 16:04 by PCW.
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22 Nov 2017 16:02 #102192
by bevins
That's good news.
Is there any documentation on the 8C20?
Replied by bevins on topic 8i20 with 7i77/7i74 combo
Mesa should have more 8I20s available in about 2 weeks
We have had a part kit waiting for the 3 phase bridge chips for months
(Onsemi took over Fairchild and some Fairchild part had almost year lead times)
That's good news.
Is there any documentation on the 8C20?
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22 Nov 2017 22:08 #102225
by tommylight
Replied by tommylight on topic 8i20 with 7i77/7i74 combo
I had a look at granite devices, i think they started in the cnczone forum a long time ago with an open source DSP servo drive. They do look promising for sure, and at 500 euro a piece i can live with that. Anyone here had any experience with them? I just need to know how reliable they are.
I have to decide on something that i can use on other projects also, not just this one.
Regards,
Tom
I have to decide on something that i can use on other projects also, not just this one.
Regards,
Tom
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23 Nov 2017 00:25 #102230
by bevins
They only go up to 170v i think. The motors are 400 volts.
Replied by bevins on topic 8i20 with 7i77/7i74 combo
I had a look at granite devices, i think they started in the cnczone forum a long time ago with an open source DSP servo drive. They do look promising for sure, and at 500 euro a piece i can live with that. Anyone here had any experience with them? I just need to know how reliable they are.
I have to decide on something that i can use on other projects also, not just this one.
Regards,
Tom
They only go up to 170v i think. The motors are 400 volts.
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23 Nov 2017 02:27 #102243
by tommylight
Replied by tommylight on topic 8i20 with 7i77/7i74 combo
My drives are 220V AC three phase, Argon drive is a single phase 80 to 264V AC so 220V is all good.
The motors should be around 300V, as that is roughly the DC voltage after rectifying in the drive.
The motors should be around 300V, as that is roughly the DC voltage after rectifying in the drive.
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23 Nov 2017 09:10 #102252
by bevins
I have 1.8KW motors. The Granite devices are 1.5, so I guess I would not be able to use them. I'll go with the 8i20's.
Replied by bevins on topic 8i20 with 7i77/7i74 combo
My drives are 220V AC three phase, Argon drive is a single phase 80 to 264V AC so 220V is all good.
The motors should be around 300V, as that is roughly the DC voltage after rectifying in the drive.
I have 1.8KW motors. The Granite devices are 1.5, so I guess I would not be able to use them. I'll go with the 8i20's.
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23 Nov 2017 14:19 #102259
by tommylight
Replied by tommylight on topic 8i20 with 7i77/7i74 combo
Bevins,
You might make them work and quite usable, but not to levels it was. I have 0.85KW motors so they should do just fine. Am placing an order for 3 or 4 of them tomorrow and wait a lot till they get here, as they have to go to Austria first and then here from Austria. Also coolers and a programing dongle. All that still under the price of a single used Yaskawa drive.
Now to find a decent spindle drive! Found an old Toshiba plain VFD ( no sensors, spindle orient, etc that the original has ) but for 750 euro for a 22KW spindle drive i think it is worth it. The only problem, original Yaskawa 200V 3phase, Toshiba 380V 3phase. Need to find out if the output voltage can be limited, otherwise i can not use it.
You might make them work and quite usable, but not to levels it was. I have 0.85KW motors so they should do just fine. Am placing an order for 3 or 4 of them tomorrow and wait a lot till they get here, as they have to go to Austria first and then here from Austria. Also coolers and a programing dongle. All that still under the price of a single used Yaskawa drive.
Now to find a decent spindle drive! Found an old Toshiba plain VFD ( no sensors, spindle orient, etc that the original has ) but for 750 euro for a 22KW spindle drive i think it is worth it. The only problem, original Yaskawa 200V 3phase, Toshiba 380V 3phase. Need to find out if the output voltage can be limited, otherwise i can not use it.
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23 Nov 2017 14:27 #102260
by andypugh
Replied by andypugh on topic 8i20 with 7i77/7i74 combo
The motor probably doesn't particularly care about the voltage as long as the current is in-range.
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