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Configuring LinuxCNC
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Getting started with Linux, LinuxCNC and CNC
Getting started with Linux, LinuxCNC and CNC
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20 Jul 2016 08:30 #77682
by sharpshooterser
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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20 Jul 2016 09:36 #77690
by andypugh
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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20 Jul 2016 13:16 - 20 Jul 2016 13:17 #77707
by sharpshooterser
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?
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20 Jul 2016 13:21 #77708
by andypugh
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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20 Jul 2016 13:26 #77711
by sharpshooterser
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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20 Jul 2016 13:40 #77715
by andypugh
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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20 Jul 2016 13:58 - 20 Jul 2016 14:04 #77718
by sharpshooterser
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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Configuring LinuxCNC
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Getting started with Linux, LinuxCNC and CNC
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