Lo ejes dejaron de moverse

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1 year 4 months ago #330525 by Johnnysacalu
Hola a todos soy muy novato en esto pero lo intento.
Monte un  plasma cnc con mesa 7i97s que consequi hacer que funcione bien hasta que le puse el thcad2, le hice solo 3 pruebas de antorcha y los motores ya no se mueven, save alguien si puede ser que se haya quemado la tarjeta 7i96. Se conecta a linux puedo encender antorcha pero no se como verificar cual puede ser el problema, gracias.

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1 year 4 months ago #330526 by PCW
Replied by PCW on topic Lo ejes dejaron de moverse
7I97 or 7I96?
 

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1 year 4 months ago #330548 by Johnnysacalu
Perdon 7i96s

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1 year 4 months ago #330549 by Johnnysacalu
7i96s
 

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1 year 4 months ago #330571 by Johnnysacalu
Todas las fuentes de alimentación dan el voltaje correcto los motores se quedan frenados como si funcionaran pero no se mueven la verdad es que no se si se pudo aver quemado la placa.
Tengo cables blindados puestos a tierra aun que no si es una medida para que no se queme.
Que mas puedo comprobar?

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1 year 4 months ago #330575 by PCW
Replied by PCW on topic Lo ejes dejaron de moverse
The fact that it quit working after firing the torch suggest a grounding or EMI issue.

If communication work but you don't get motion, it may be they the step/dir 
output drivers have been damaged. One way to check this is to disconnect the
motor drive step/dir signals and measure the 7I96S step/dir output voltages

The step and direction output voltages should be in one state when the 7I96S card is 
first powered up, and in the opposite state when LinuxCNC is started. 

That is the output voltage should be very close to 5V in one state and very close to
0V in the other state.

If the voltage does not change or you get any voltage that not close to 0V or 5V, this
indicates damaged to the 7I96S step/dir outputs.
 

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1 year 4 months ago #330599 by Johnnysacalu
Menos de 1v antes de encender linuxcnc y 0v cuando lo enciendo en step/dir
pero tengo tierra, cables blindados y filtro emi que pudo fallar? 
 

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1 year 4 months ago #330603 by PCW
Replied by PCW on topic Lo ejes dejaron de moverse
Short in the wiring, missing ground or something similar is possible.
Plasma systems are pretty unforgiving due to the massive EMI they
generate at arc start.

The card is likely repairable by replacing U5 and/or U7

Even shielded cables can be a liability if there is a ground error
as they can couple ground noise into the signals.

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1 year 4 months ago #330870 by Johnnysacalu
He medido los voltios otra vez ahora me da 4,8v antes de encender linuxcnc y lo mismo cuando lo enciendo pero cuando le doy a mover cambia a zero voltios para un lado y y para el otro cambia muy poco

O si crees que es lo mismo u5 y u7 saves quien me la puede arreglar? O donde pedir los componentes 

Gracias 

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1 year 4 months ago #330871 by PCW
Replied by PCW on topic Lo ejes dejaron de moverse
U5 = MC74ACT540DTR2G

U7 = MC74ACT541DTR2G

Digikey has these
 
You could also do a test to verify that the card is generally OK
by moving one axis to stepgen.04 (on TB2) because this STEP/DIR
channel uses a different driver chip (Stepgens 00..03 use U5,U7)

to test this you would have to edit the stepgen numbers in the hal file
or make a new configuration using stepgen.04 for say the x axis

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