Brother TC-211
13 Jul 2014 05:42 #48698
by andypugh
My first guess would be that there is a drive-enable signal (and possibly a charge-pump safety signal) that wasn't present during the battery test.
Is it possible to leave everything "normal" except for the command signal from the battery?
Can you measure the signals on all the other pins when the drive is working properly? Try the AC range on your multimeter too (or a scope) to look for charge-pump style signals.
Replied by andypugh on topic Brother TC-211
I tried a 1.5v battery test on the z axis. I connected up the leas to the servo driver and nothing happene. Re connected the lines and got movement. If anyone has any ideas please chime in.
My first guess would be that there is a drive-enable signal (and possibly a charge-pump safety signal) that wasn't present during the battery test.
Is it possible to leave everything "normal" except for the command signal from the battery?
Can you measure the signals on all the other pins when the drive is working properly? Try the AC range on your multimeter too (or a scope) to look for charge-pump style signals.
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13 Jul 2014 06:08 #48699
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
I posted the wiring out diagram. As for a charge pump, I have no idea what that is. Sorry.
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13 Jul 2014 06:12 #48700
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Also anyone willing to take a trip up to CT to do the conversion. I will help. Send me an email or just call. My number is (860) 770-3476. I really need the machine converted. I have a few jobs waiting for the machine to get running. And I am serious about the $1000.00 to someone who knows what they are doing.
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13 Jul 2014 06:29 #48703
by andypugh
That's fine. I was hoping to prompt an internet search which would lead to much more (and better) info that I could type in an evening.
A charge-pump is an an attempt to address the problem of what happens if the PC freezes and leaves all the outputs at the state they were.
If an axis is running at full speed, and you hold that command, while all the feedback control, limit switches, everything else, is dead, then bad things happen. Quickly.
Interestingly step-dir drives have an implicit charge-pump in their operation.
The worry for an +/-10V system driven by PWM is that the PC might freeze with the PWM pin high.
So, a charge-pump circuit is something that turns off power if the input holds a constant value, rather than oscillating as expected. A Watchdog is a digital version of the same idea. if the watchdog code doesn't see the input change for longer than the specified time, it triggers a shutdown.
The various hardware interface cards supported by LinuxCNC typically have a watchdog. If they don'e see a read/write cycle from HAL for more than a few mS they shut down . An actual charge-pump circuit can be used to control a relay in the e-stop chain.
www.cnczone.com/forums/gecko-drives/4093...ge-pump-circuit.html has some info and links.
Replied by andypugh on topic Brother TC-211
I posted the wiring out diagram. As for a charge pump, I have no idea what that is. Sorry.
That's fine. I was hoping to prompt an internet search which would lead to much more (and better) info that I could type in an evening.
A charge-pump is an an attempt to address the problem of what happens if the PC freezes and leaves all the outputs at the state they were.
If an axis is running at full speed, and you hold that command, while all the feedback control, limit switches, everything else, is dead, then bad things happen. Quickly.
Interestingly step-dir drives have an implicit charge-pump in their operation.
The worry for an +/-10V system driven by PWM is that the PC might freeze with the PWM pin high.
So, a charge-pump circuit is something that turns off power if the input holds a constant value, rather than oscillating as expected. A Watchdog is a digital version of the same idea. if the watchdog code doesn't see the input change for longer than the specified time, it triggers a shutdown.
The various hardware interface cards supported by LinuxCNC typically have a watchdog. If they don'e see a read/write cycle from HAL for more than a few mS they shut down . An actual charge-pump circuit can be used to control a relay in the e-stop chain.
www.cnczone.com/forums/gecko-drives/4093...ge-pump-circuit.html has some info and links.
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13 Jul 2014 06:38 #48704
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Andy Any chance you might want to take a road trip up here 
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13 Jul 2014 06:59 #48706
by andypugh
$1000 wouldn't even cover my air-fare. I am in the UK.
I reckon we will get there on the forum, it will just be slower.
Replied by andypugh on topic Brother TC-211
Andy Any chance you might want to take a road trip up here
$1000 wouldn't even cover my air-fare. I am in the UK.
I reckon we will get there on the forum, it will just be slower.
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13 Jul 2014 07:09 #48707
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
It was worth a shot
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15 Jul 2014 09:16 #48791
by mblaszkiewicz
OK seems like it will not work with just a battery hooked up to the servo motor. wondering if you have any ideas about the drive enable or current limit mode and how to bypass of provide signal to it and where.
Replied by mblaszkiewicz on topic Brother TC-211
Here are representative connection guesses for X (channel 0)
DRIVE 7I77 ENCODER CN8-10 A TB3-1 CN8-9 /A TB3-2 CN8-12 B TB3-4 CN8-11 /B TB3-5 CN8-17 Z TB3-7 CN8-13 /Z TB3-8 ANALOG VELOCITY COMMAND CN8-1 AOUT TB5-4 CN8-2 GND TB5-3 DRIVE ENABLE CN8-15 ENA+ TB5-2 CN8-16 ENA- TB5-1
I am making some assumptions here,
first assumption is that the start pin of the drive is not latched (its a drive enable)
The second assumption is that the current limit mode is not needed
OK seems like it will not work with just a battery hooked up to the servo motor. wondering if you have any ideas about the drive enable or current limit mode and how to bypass of provide signal to it and where.
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15 Jul 2014 09:25 #48792
by PCW
Replied by PCW on topic Brother TC-211
I would not expect a battery on the drive analog inputs to
drive the motor unless the drive was enabled.
AFAICT from the manual, the drive is enabled by shorting CN8-15 to CN8-16
drive the motor unless the drive was enabled.
AFAICT from the manual, the drive is enabled by shorting CN8-15 to CN8-16
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16 Jul 2014 07:30 #48824
by mblaszkiewicz
Replied by mblaszkiewicz on topic Brother TC-211
Went back and jumped pin 15 and 16, applied power nothing still. Any more ideas.
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