Thanks!
I bought it for a company called Omc stepper online
3 Axis TB6600 CNC Stepper Motor Driver Controller Board For CNC Router Milling|3-TB6600|Stepper Motor Drivers
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Thanks!
Double
Last edited by Rockfella; 12-23-2014 at 06:15 AM.
Hi everyone. Having some issues with my YOOCNC-NT65-3x card. The Y axis steppermotor all of the sudden started vibrating. I can´t make any sense of it as it has been running smooth for about 3 months. As I turn down the velocity and steps/min there is a quite weird characteristic, if I give it a steady jog it does 17 steps in one direction then changes back 17 steps and this just keeps on going. I checked the capacitors but no faulty there. Any idea on where to look? Thanks!
Hallo, I do all the mods with the resuld the system is generating and not working wel and the steppers wil very hot.
Guys,
Can you tell me whether the missing steps issue can also be extra steps.
I've been consistently getting around 0.5% too many steps.
I've tried adjusting the calibration in Mach3 from 400 steps per to 398 steps per, and I think this probably helps a bit, but ultimately if its a noise issue on supply or signal lines then this sort of hack is not going to work
So.
I suspect its best to solder on the added caps as detailed in the various postings in this thread, and see if that help ??
Hi Pedro34,
The DCDC is to separate voltages.
Chris
I bought other model of tb6560 controller, in theory is better that other models because it has hex converter in pin 3: https://www.amazon.com/SainSmart-TB6...ller+sainsmart
I put the 470nF caps between 15 and 20 pin of every chip, is this the same of your model board for mine? I noticed a reduction in noise (just like low decay config) instead of being set on fast decay, but the acurrancy is not good enought, almost the same before. Could you give me a clue of more settings please. PD: sorry for bad english.
Paul
I bought other tb6560 board of $100 for replacing a cheaper one , I will tell you if the problem is in all of them.
This is loosing 1 milimeter in every level I draw, even if the 470nFcaps are soldered:
https://www.amazon.com/SainSmart-TB6...ller+sainsmart
Now I´m trying to prove this:
https://www.amazon.com/RioRand-Alumi...cnc+controller
Let´s see the next week if this is better or maybe I´ll need a Gecko
Hey all, it's been a while since I last posted in this topic. My modified YOOCNC-NT65-3X is still working very well.
I have noticed that different manuals for this controller seem to contradict info regarding the polarity for the STEP inputs. My YOOCNC manual suggest they are active-high, but others that I've seen show active-low.
I think that the TB6560 datasheet appears to suggest that it will step on a rising-edge CLK (going by the rising edge symbol). Working back though the circuitry I get the following:
1. The TB6560 steps on a rising edge of the CLK.
2. The 6N137 inverts the signal, but since its input is fed into the cathode, the net result is non-inverted.
3. 74HC14 inverts the signal.
Result: I think the DB25 STEP signal would need to be active-low.
From my observations, active-low on the step signals seems to generate more heat on the steppers.
Any thoughts?
It could be the high logic level on the step input switches the driver from its idle state to full current mode
another chinese design error ?
I expect they should off used two of the 74HC14 inverters so a positive going input drives the TB6560 step input positive
John
PS
if your board is like this -
it could be easier adding the extra inverter to the base of the emitter follower in the idle current control circuit
Last edited by john-100; 12-25-2016 at 10:22 AM.
Hi John,
You might be right.
Orange = CLK
Green = TQ1 & TQ2
TQ1/TQ2 HIGH = 20% torque
TQ1/TQ2 LOW = 100% torque
Stepping occurs on the rising-edge of CLK, and each time that is 20% torque ...
Quite possibly a fault. Would like to know more before I go modding the board again though.
Does anyone have an oscilloscope to map the waveforms for CLK/TQ1/TQ2 ?
Cheers.
I used the DMM to perform some basic logic checks on the circuit board. The circuit logic appears to be correct, so either there's a bug in the schematic diagram, or it's slightly different to my board.
This is how I perceive the board to be working:
The torque is reduced while sitting idle (CLK=HIGH; TQ=HIGH. When a step command is issued, the CLK goes LOW, which brings TQ LOW (increasing torque), then step occurs on the rising edge of CLK. There is a RC with 8µS time constant that holds the torque pin LOW (100% torque) after the rising-edge clock. I'd say this ensures full torque throughout the step action. I'd need to borrow a logic analyser to watch whats going on during operation.
Orange = CLK
Green = TQ1 & TQ2
To answer the original question .. the step pins are active-high (at the DB25). You'll know when this is correct, as the steppers are a lot easier to freewheel (at idle).
Cheers.
Hi Helisat
the step & tq pulse diagram in post 133 is what I'd expected
although the RC time constant is a bit short -
I would of made it long enough to be still in high torque when the next step pulse arrives
John
I agree with you on the time constant. I'll check the circuit tomorrow, might just be a bug in the schematic (820nF instead of pF).
Salve a tutti ho lo stesso problema di perdita passi asse x
Ho letto tutti i vostri consigli ma sulla mia scheda dove dovrei saldare i condensatori ceramici da 475nf?
Grazie a tutti e aiutatemi
La mia scheda è una jp382c simile alla vostra