5i25 7i77 7i74/7i84, 7i71. Power up issues
06 Nov 2017 22:39 #101469
by bevins
5i25 7i77 7i74/7i84, 7i71. Power up issues was created by bevins
Hi,
I think i may have a dead 7i71.
Tthe 7i71and 7i84 both are connect to a 7i74.the 7i84 powers up no problems and i can see it in linuxcnc however the 7i71 has no yellow power lite and I cannot see it in linuxcnc. I changed ports on 7i74 no dice, changed cable with the 7i84 and still no lites on 7i71 but the 7i84 comes up fine.
So this looks like a dead 7i71???
Thanks,
Bob
I think i may have a dead 7i71.
Tthe 7i71and 7i84 both are connect to a 7i74.the 7i84 powers up no problems and i can see it in linuxcnc however the 7i71 has no yellow power lite and I cannot see it in linuxcnc. I changed ports on 7i74 no dice, changed cable with the 7i84 and still no lites on 7i71 but the 7i84 comes up fine.
So this looks like a dead 7i71???
Thanks,
Bob
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07 Nov 2017 00:37 #101479
by PCW
Replied by PCW on topic 5i25 7i77 7i74/7i84, 7i71. Power up issues
Looks like no VIN
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07 Nov 2017 05:25 #101482
by bevins
Theres power on vin. Ill chck again tomorrow though.
With no vin on the 7i84,you still get the yellow 5v light.
Replied by bevins on topic 5i25 7i77 7i74/7i84, 7i71. Power up issues
Looks like no VIN
Theres power on vin. Ill chck again tomorrow though.
With no vin on the 7i84,you still get the yellow 5v light.
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07 Nov 2017 14:28 #101493
by PCW
Replied by PCW on topic 5i25 7i77 7i74/7i84, 7i71. Power up issues
Yes, the 7I84 has the cable power light, the 7I71 doesn't
The top yellow light on the 7I71 is run by 3.3V power
3.3V power comes from a regulator supplied by VIN
The top yellow light on the 7I71 is run by 3.3V power
3.3V power comes from a regulator supplied by VIN
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07 Nov 2017 18:35 - 07 Nov 2017 18:36 #101502
by bevins
Yes I got it figured out. Seems the 7i77 doesn't like 5v vin power...lol.
I hate always being wrong......
Anyway, thanks, got everything up and running. Now on to tuning servo's....
Replied by bevins on topic 5i25 7i77 7i74/7i84, 7i71. Power up issues
Yes, the 7I84 has the cable power light, the 7I71 doesn't
The top yellow light on the 7I71 is run by 3.3V power
3.3V power comes from a regulator supplied by VIN
Yes I got it figured out. Seems the 7i77 doesn't like 5v vin power...lol.
I hate always being wrong......
Anyway, thanks, got everything up and running. Now on to tuning servo's....
Last edit: 07 Nov 2017 18:36 by bevins.
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07 Nov 2017 19:09 #101506
by PCW
Replied by PCW on topic 5i25 7i77 7i74/7i84, 7i71. Power up issues
Yeah the switching regulator for VIN has a high maximum input voltage (50V)
but that unfortunately also means it has a high minimum input
(it wont run below about 7V)
but that unfortunately also means it has a high minimum input
(it wont run below about 7V)
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