New error No control?? 5i25 7i77 Over Voltage!

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31 Aug 2020 19:11 #180212 by eighthaxis
Thanks for the input Tommy.
If you are thinking the power supply had a rectifier failure that is not the case.
I only have DC going to the 7i77.
I did measure it both in AC and DC mode and it only measures DC.
Or am I not following you?
The following user(s) said Thank You: tommylight

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31 Aug 2020 20:24 #180218 by tommylight

I did measure it both in AC and DC mode and it only measures DC.

That is what i needed and that is good.
Also do measure form the + terminal on the 7i77 to the machine ground and again from the - terminal to the ground, both AC and DC measurements.

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31 Aug 2020 21:49 #180238 by eighthaxis
Tommy:
There is no bleedthough and the power supply is fine I even check it with my oscilloscope but any other ideas are welcome.


Peter:
I blew off the boards and inspected everything thoroughly to no avail.
Then I disconnected every IO plug which changed nothing.
Any other ideas would be greatly appreciated as I just got a new spindle and some AC brushless servos and I am ancy to finally get cutting some parts.

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01 Sep 2020 10:37 #180297 by tommylight

Tommy:
There is no bleedthough and the power supply is fine I even check it with my oscilloscope but any other ideas are welcome.

Nice, but that leaves only wiring, namely the positive side going to switches is loose/nicked/not making good contact.

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01 Sep 2020 14:53 #180334 by eighthaxis
How could that be when I disconnected all of the I/O yet the problem still persists?

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01 Sep 2020 20:52 #180354 by tommylight

How could that be when I disconnected all of the I/O yet the problem still persists?

Hmmm , so just to be on the same page, you have removed all the plugs from 7i77 except the DB25, 5V power and 24V power, but still get that error, right ?

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01 Sep 2020 20:53 #180355 by tommylight
Can you take pictures of the 5i25 as it sits inside the PC and the 7i77 ?

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02 Sep 2020 00:03 #180374 by eighthaxis
Just to confirm Tommy yes no IO plugged in only db25 and two power connectors. I also measured the power supply on the PC and it was all within spec.

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02 Sep 2020 00:05 #180375 by eighthaxis
Peter do you think that one or both of the cards died?
If so do you have any in stock I could buy?
What is the cost to repair them?

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02 Sep 2020 00:47 #180379 by sprintertrd
It could be as simple as a voltage divider resistor on the board is faulty, but PCW would need to point out where the location is and what the resistor values are.

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