Getting started with Linux, LinuxCNC and CNC

sharpshooterser
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20 Jul 2016 08:30 #77682 by sharpshooterser

Replied by sharpshooterser on topic Getting started with Linux, LinuxCNC and CNC

Just another thought, on the interrupter itself (a+z) there are no resistors. They must be inside somewhere on the board so maybe just hooking the wires up directly to the board itself isnt a way to go?

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andypugh
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20 Jul 2016 08:42 #77683 by andypugh

Replied by andypugh on topic Getting started with Linux, LinuxCNC and CNC

Can you see a part-number on the sensors?

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sharpshooterser
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20 Jul 2016 08:58 #77684 by sharpshooterser

Replied by sharpshooterser on topic Getting started with Linux, LinuxCNC and CNC

Unfortenatley, I cant see them anywhere. But here are the shematics.

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andypugh
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20 Jul 2016 09:36 #77690 by andypugh

Replied by andypugh on topic Getting started with Linux, LinuxCNC and CNC

Can you see any current-limiting resistors on the little PCB in the sensor-box?

Are the LEDs wired in series or parallel?

If the measured voltage at the sensor-box end of the 5V wire is less than 5V then that would tend to suggest that there is current limiting in the supply. If it is a full 5V then is sounds like the current limiting is in the sensor-box or in the devices themselves.

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sharpshooterser
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20 Jul 2016 09:46 #77691 by sharpshooterser

Replied by sharpshooterser on topic Getting started with Linux, LinuxCNC and CNC

I ll measure it, and post the results here so we can see whats going on

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sharpshooterser
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20 Jul 2016 13:16 - 20 Jul 2016 13:17 #77707 by sharpshooterser

Replied by sharpshooterser on topic Getting started with Linux, LinuxCNC and CNC

Stupido me, I brought it home, and I forgot that I dont have power source here to take any kind of measurements.
Better photos are included, but its not likely that they will be too much help?

Last edit: 20 Jul 2016 13:17 by sharpshooterser.

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andypugh
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20 Jul 2016 13:21 #77708 by andypugh

Replied by andypugh on topic Getting started with Linux, LinuxCNC and CNC

You should be able to figure out if the LEDs are wired series or parallel.
If you had a bench PSU you could see what voltage the LEDs take to reach 20mA. That would hint whether the Optos were 5V devices or not.

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sharpshooterser
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20 Jul 2016 13:26 #77711 by sharpshooterser

Replied by sharpshooterser on topic Getting started with Linux, LinuxCNC and CNC

I ll have to hook it up to the machine to take measurements.
From few days ago, if I recall correctly, a friend tried to do the measuring, and he was getting 5V, and 1.2V. But that doesnt help much...

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andypugh
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20 Jul 2016 13:40 #77715 by andypugh

Replied by andypugh on topic Getting started with Linux, LinuxCNC and CNC

sharpshooterser wrote:
From few days ago, if I recall correctly, a friend tried to do the measuring, and he was getting 5V, and 1.2V. But that doesnt help much...

Actually, it probably does help. What does your multimeter read in diode-check mode on the LEDs (test both ways round).

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sharpshooterser
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20 Jul 2016 13:58 - 20 Jul 2016 14:04 #77718 by sharpshooterser

Replied by sharpshooterser on topic Getting started with Linux, LinuxCNC and CNC

OK, its fiddly to touch and measure right now. When I put multimeter to 200 ohms, and somehow touch all 4 pins of the forward (higher LED) I get a 1.5 reading. When in diode check, I get 001 on display (when not touching anything it reads 1 but in the opposite corner). I ll dismantle it again to check the other

Last edit: 20 Jul 2016 14:04 by sharpshooterser. Reason: wrong readout, instead of 0.9 its 1.5

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