Brother TC-211
- mblaszkiewicz
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03 Aug 2014 05:47 #49453
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Ouch voltage is 32 on the board. When I checked it by itself it was only 22 volts. Monday I will go get a 24 volt dc power supply
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03 Aug 2014 05:49 - 03 Aug 2014 05:58 #49454
by PCW
Replied by PCW on topic Brother TC-211
The 7I77 reports an overvoltage error at 34V +-5% Once this condition is detected it is latched
so even a short peak > 32 V will cause this
So even if you have an average voltage of 22 V you must have peaks >~32V
so you have a problem with your power supply (and it may kill your 7I77 if not fixed)
so even a short peak > 32 V will cause this
So even if you have an average voltage of 22 V you must have peaks >~32V
so you have a problem with your power supply (and it may kill your 7I77 if not fixed)
Last edit: 03 Aug 2014 05:58 by PCW.
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03 Aug 2014 05:49 #49455
by andypugh
How are you measuring it? If your PSU is a rectifier only then without a fllter capacitor on the output the voltage measured with a voltmeter will be lower than the peak voltage.
Replied by andypugh on topic Brother TC-211
My field voltage is 22 volts
How are you measuring it? If your PSU is a rectifier only then without a fllter capacitor on the output the voltage measured with a voltmeter will be lower than the peak voltage.
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03 Aug 2014 07:02 #49456
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
opps needed to delete that. I mesured the voltage on the 7i77 card at 32 volts. It is now disconected until I get a new power supply.
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04 Aug 2014 00:09 #49464
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Ok borrowed apower supply. Got linux running. I tried to manually move the machine and got a joint 1 error. Any ideas would be helpful
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04 Aug 2014 00:36 - 04 Aug 2014 00:43 #49465
by PCW
Replied by PCW on topic Brother TC-211
Joint following errors are expected at this point
In a lazy copy/paste from another post, here are the basic
stages to getting a velocity mode servo system running:
1. Get encoders working, scaled right and in the right directions
2. Get drive enables controlled by linuxcnc
3. Set per axis following error limits wide enough to allow tuning (say 1 inch or 20 mm)
4. Verify feedback direction (expect runaways) you may have to change the sign of the analog outputs
5. Tune PID
This is a short guide to velocity mode servo system tuning:
gnipsel.com/linuxcnc/tuning/servo.html
In a lazy copy/paste from another post, here are the basic
stages to getting a velocity mode servo system running:
1. Get encoders working, scaled right and in the right directions
2. Get drive enables controlled by linuxcnc
3. Set per axis following error limits wide enough to allow tuning (say 1 inch or 20 mm)
4. Verify feedback direction (expect runaways) you may have to change the sign of the analog outputs
5. Tune PID
This is a short guide to velocity mode servo system tuning:
gnipsel.com/linuxcnc/tuning/servo.html
Last edit: 04 Aug 2014 00:43 by PCW.
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04 Aug 2014 20:21 #49492
by BigJohnT
Replied by BigJohnT on topic Brother TC-211
Peter,
I added steps 1 - 4 to the tutorial to save typing time.
JT
I added steps 1 - 4 to the tutorial to save typing time.
JT
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06 Aug 2014 05:58 - 06 Aug 2014 06:01 #49545
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Ok got servos running in open loop test of pnccon. How do I check the encoders to see if they are working correctly.
Also if anyone has any idea on how to keep the z axis from falling on start up I would appericiate the hints
Also if anyone has any idea on how to keep the z axis from falling on start up I would appericiate the hints
Last edit: 06 Aug 2014 06:01 by mblaszkiewicz.
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06 Aug 2014 06:53 #49546
by andypugh
Can you rotate the screws with the servos off?
You need to make sure that a positive voltage to the drives moves the axes in the positive direction. Then make sure that a postive move makes the encoders count up.
You can do this in the GUI. Don't power up the drives, set the GUI to show actual rather than commanded position, and move the axes by hand.
[/quote]Also if anyone has any idea on how to keep the z axis from falling on start up I would appericiate the hints[/quote]
i guess there is some delay between the brake releasing and the drive enabling. What is break-release connected to? Ideally it would connect to drive-enable. Possibly with a delay component set to a small fraction of a second.
Replied by andypugh on topic Brother TC-211
Ok got servos running in open loop test of pnccon. How do I check the encoders to see if they are working correctly.
Can you rotate the screws with the servos off?
You need to make sure that a positive voltage to the drives moves the axes in the positive direction. Then make sure that a postive move makes the encoders count up.
You can do this in the GUI. Don't power up the drives, set the GUI to show actual rather than commanded position, and move the axes by hand.
[/quote]Also if anyone has any idea on how to keep the z axis from falling on start up I would appericiate the hints[/quote]
i guess there is some delay between the brake releasing and the drive enabling. What is break-release connected to? Ideally it would connect to drive-enable. Possibly with a delay component set to a small fraction of a second.
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09 Aug 2014 06:18 - 09 Aug 2014 06:18 #49611
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Ok found a few little hick ups on my part. 1st wired the limits wrong. Need some one a little bettwer then my on it. I'm a little lost
what I did was took the two leads from the limit switch (nc switch)
wired 1 end to tb8 pin 1
wired the other to a terminal block
wired 24v pos to tb2 pin 1
wired 24v neg to tb2 pin 8
wired terminal block to tb2 pin 2.
Also no position info from resolver/encoder.
I disconected the power to my z axis , removed it from the machine (easiest to remove) turned the motor by hand, no position read out change.
I was able to have linus move it also in a countinous movement. No change in the position readout.
what I did was took the two leads from the limit switch (nc switch)
wired 1 end to tb8 pin 1
wired the other to a terminal block
wired 24v pos to tb2 pin 1
wired 24v neg to tb2 pin 8
wired terminal block to tb2 pin 2.
Also no position info from resolver/encoder.
I disconected the power to my z axis , removed it from the machine (easiest to remove) turned the motor by hand, no position read out change.
I was able to have linus move it also in a countinous movement. No change in the position readout.
Last edit: 09 Aug 2014 06:18 by mblaszkiewicz.
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