7i76 Spindle Output Not working

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02 Feb 2023 20:46 #263547 by mloser
I first run linuxcnc and then from the Hal Command window run 
"unlinkp hm2_5i25.0.7i76.0.3.spinout"  which is successful.
Then I run
"setp hm2_5i25.0.7i76.0.3.spinout 10"  which is successful,
but when I read the voltage between pins 1 and 2 on TB4 I always see 0 volts.
I have +12 volts between pins 1 & 3 (supplied by the spindle drive).
No matter what I set spinout to, I read 0 volts with the volt meter.
Does this mean the 7i76 board is damaged?
Or am I missing something in software?

Thank you,
Mike


 

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02 Feb 2023 21:19 #263549 by tommylight
Is the spindle enabled?
Spiena or spinena, i forgot, must be enabled for outputs to work, that also closes the enable outputs for spindle.

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03 Feb 2023 13:50 #263598 by mloser
7i76 spinena is on.
My spindle drive provides +12,  -12 and common for the input signal.  I may have damaged the digital pot chip by applying -12 to pin1 and +12 to pin 3 on 7i76 TB4 until I realized that the 7i76 book says 15 vdc max.  At this point, I will have to replace the chip because I can't afford a new 7i76.  Does that seem like the right thing to do?  Does Mesa provide any more information on how this circuit works?

Thank You,
Mike

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03 Feb 2023 20:35 #263621 by PCW
Replied by PCW on topic 7i76 Spindle Output Not working
Yes, its likely you damaged both the OP-Amp (NE5230 or TLV2371) and CD4001 parts on the 7I76 by applying 24V

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03 Feb 2023 22:03 #263633 by mloser
Thanks for your help! 

I ordered the TI op amp since it's good for 16v instead of 15v.

 

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13 Feb 2023 16:42 #264436 by mloser
I replaced the rail to rail op amp and the quad nor gate (CD4001) chip but it still doesn't work,
so I ordered a new 7i76. What units does the 7i76 spinout value use?  Volts?
I can set it to anything I want using the halcmd setp but it always reads
the same as the positive supply voltage provided by the spindle controller to TB4 pin 3
at TB4 pin 2 (spinout).  

Thanks,
Mike

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13 Feb 2023 18:39 - 13 Feb 2023 18:40 #264446 by PCW
Replied by PCW on topic 7i76 Spindle Output Not working
The output scaling is usually set with the ini parameter OUTPUT_SCALE
in the SPINDLE_0 section of the ini file (current LinuxCNC versions
and pncconf created hal /ini files)

When spinout = the output scale value, you get 100 % output (spinout = SPIN+ voltage)
Normally OUTPUT_SCALE would be set for max RPM
Last edit: 13 Feb 2023 18:40 by PCW.

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17 Feb 2023 02:47 #264680 by mloser
Thanks, I set OUTPUT_SCALE to 1800.
I installed a new 7i76 board and the output is the same as the 1st board I repaired.  No matter what I set "spinout" to, the output at TB4 pin2 is100%.   Could I have wrong firmware in the 7i76? 
TB4 pin1== 0 volts
TB4 pin2== 12 volts

spinout== 1800     12volts on pin2
spinout== 0            12 volts on pin2
spinout== -1800  12 volts on pin2

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17 Feb 2023 02:57 #264682 by PCW
Replied by PCW on topic 7i76 Spindle Output Not working
What is TB4 pin2 relative to TB4 pin1 when LinuxCNC is not running?

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17 Feb 2023 14:28 #264693 by mloser
With LinuxCNC not running:

TB4 Pin1 == 0 volts
TB4 Pin2 == 0 volts
TB4 Pin3 == 12 volts


Thanks,
Mike

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