TB6560 connected motors very noisy at rest.
Hi all...
I have a 4 axis TB6560 board from Ebay (Mega Supply) running two 1.5A 100oz-in motors and a 3A 425oz-in motor. I am using a PC PSU to supply 12V. to the card.
My issue is that the motors are EXTREMELY noisy when at idle (whine/hiss). The TA8435 drivers I have used with these 1.5A motors in the past were absolutely silent. I have tried 2 different PSUs and fiddled with the decay mode (tried Fast and 50%), however the noise remains.
Could this problem be related to my use of a 12V PC PSU? I was intending to go to 24V soon to increase rpm (max is about 120 right now) anyway. From other posts here I think 24V is the absolute maximum I will be trying with this card.
From my limited knowledge, the increase in voltage should allow the current limit to be reached sooner. If the 12V supply is not driving the motors hard enough I guess that the motors might not be reaching their current limit within the PWM period, thus causing the noise... But I could be COMPLETELY wrong - any feedback would be most gratefully received.
AFAIC The noise is more disconcerting than anything, however as I ran these motors (except the 425oz-in) silently with the TA8435 driver I would really like to quieten them down somehow.
Cheers,
Robo...
TB6560 Card not picking up estop/limit inputs
Well I guess I must be getting used to the hiss noise - after a couple of hours I am already desensitised... That and the massive mains fan I am using to cool the driver enclosure - I would rather not fry any more diodes...
I upgraded my power supply from a PC PSU to a 150W switchmode 24V one and am quite happy with the increase in speed. Had to play around with the acceleration though as everything was going fine in the Mach motor tuning screen, but when other motors were also running I was occasionally stalling the motor. Does this suggest my power supply is deficient? At least the overkill on airflow should mean the regulators do not get a chance to get too hot. Wish I had gone to 24V with my TA8435 based machine from the start.
I finally got round to hooking up my limit switches and have found the card does not pass any of these signals back to the parallel port. Damn... I have a big job to cut and cant afford to babysit the machine.
I have kludged up a short DB25 extension cable that allows me to connect the limit switches direct and that is keeping me out of trouble for the time being, however I would much rather use the opto isolation built into the card.
Does anyone know what I could look at to diagnose this issue? I don't really have the time or patience to send the card back right now, so any pointers would be appreciated.
Regards,
Robo.
TB6560 Card Spindle Control Circuit
Hi again.
I just thought I would post how I connected my spindle to the TB6560 card as there was nothing in the instructions detailing this, and I'm sure someone will find it handy, even though it is quite basic.
My card has a 4 pin connector for the spindle. This is labeled MIN GND GND MOU. I will refer to the two ground terminals as GND(1) and GND(2). When you enable the spindle motor MIN and MOU conduct - this is very different to my TA8435 cards where you got 12V out of this connector.
It might be possible to run the mains connection to your spindle through this connector, but I wouldn't - tried this with a TA8435 card (based on a schematic from CNCZONE forum) and BANG! Lesson learnt. I already had an outlet set up with a 12V relay in it, so I simply ran 12V from my PSU into the MIN/GND(1) spindle connector terminals, and connected my 12V relay to MOU/GND(2). Works perfectly...
So in text format here is what I have:
PSU +12V -> MIN
PSU 0V -> GND(1)
GND(2) -> Relay Coil -
MOU -> Relay Coil +
Relay NO contact -> mains plug (active)
Relay COM contact -> mains socket (active)
The Relay contacts are connected to a 240V mains socket into which I plug the router/drill etc. The relay switches the active line of the mains wiring.
My card is a MegaSupply 4 axis one, but there seems to be various revisions of these chinese driver boards around, and certainly with the TA8435 boards the spindle relay was wired differently from one release to another. You need to be CAREFUL with this stuff if using a mains spindle - and I would never put the mains through the card - relays are cheap and easy... Test everything thoroughly before plugging in the mains.
Regards,
Robo.