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eBay TB6560 Stepper Motor Driver Boards
Good Day All.
Has anyone here got or do you know anything about the TB6560 stepper motor driver boards that are being sold on eBay.
From the bad english in the ebay listings it looks like thease boards can run upto 36volts and upto 3amp stepper motors.
But detailed info is very limited.
I am just after your toughts on this item.
Thanks for your time.
Best Regards.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Good Day All.
Has anyone here got or do you know anything about the
TB6560 stepper motor driver boards that are being sold on eBay.
From the bad english in the ebay listings it looks like thease boards can run upto 36volts and upto 3amp stepper motors.
But detailed info is very limited.
I am just after your toughts on this item.
Thanks for your time.
Best Regards.
First thing to understanmd is never believe what suppliers say the capabilities of their boards are... read the datasheet for the chips and look at the construction.
Here we have 4 TB6560 devices sharing a single force cooled heatsink approx 30mm x 80mm x 10mm. That heatsink has a thermal resistance of about 6decC/watt and with the fan thats maybe improved to 4degC/watt (the airflow is pretty restricted). So each device is effectively fixed to a heatsink of 16degC/Watt (under worst case conditions - all axis functioning) or 12degC/W for 3-axis use.
Now look at the datasheet for the TB6560. Its allowed to run the junction at 150degC max before the thermal shutdown cuts in and the thermal resistance junction to case is 1.5degC/W. So adding that to the heatsink you have (3-axis) 12.5degC/W thermal resistance. So maximum dissipation at 25degC ambient is (150 - 25)/10.5 = 10W.
The power dissipation of the chip is approx 2 x On resistance x output current^2 = 2 x 0.4 x I^2 and this is maximum 10W so rearranging
I = sqrt(10/(2 x 0.4)) = sqrt(10/0.8) = 3.5A
So on the face of this this board can run 3A/phase steppers at full output on 3-Axis, and will probably be ok on 4-axis, but its pushing close to the thermal cutoff of the chip...
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Re: eBay TB6560 Stepper Motor Driver Boards
I like this bit.
Suppliers Warranty:
We offer one month warranty on all products purchased from us. If your item has any warranty issue please contact us for a satisfying solution.
Is that from delivery or dispatch?
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Re: eBay TB6560 Stepper Motor Driver Boards
I have ordered one of thease TB6560 boards back on the 27/10/2009, before I asked about them here.
I have no idea how long it is going to take to get from china to me with all the dam royal mail strikes on going.
The eBay ad says that it should only take upto 6-10 business days, but I will have to wait and see.
I went for the TB6560 over the TA8435H as it is ment to support upto 36volts, and the TA8435H can only support upto 24volts.
I am going to be using this board with my Astrosyn MY103H702 stepper motors.
I am looking at running 34volts to try and get as much speed out of the stepper motors as possible.
I will report back once I have got the board.
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Re: eBay TB6560 Stepper Motor Driver Boards
Hi
I'm interseted to see how you get on, I've been looking at them myself but put off by the fact its all on one board and max 36v.
But £50 ish for 4 axis with opto sounds like my budget :beer:
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Re: eBay TB6560 Stepper Motor Driver Boards
Well the post and been and gone today, but no sign of my parcel yet.
Oh well it looks like I will not get unto next week now.
I have been reading the so called bad english manual for the driver board to work out what DIP Switch settings I am going to need.
I am only intrested in switches 1-4.
Switches 1-2 are for the current setting, 100%, 75%, 50%, 25%.
Is this a case of 3.00amps, 2.25amps, 1.50amps, 0.70amps, or does the board self sence the current and when at idle or hold, hold the current at said % of the stepper motors max current.
Next is Switchts 3-4 for the Buffer, the manual just has, Fast, 25%, 50%, Slow, so at a guess I need to set it to Fast.
Then the last two switches 5-6 are for the step modes, this I understand.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Well the post and been and gone today, but no sign of my parcel yet.
Oh well it looks like I will not get unto next week now.
I have been reading the so called bad english manual for the driver board to work out what DIP Switch settings I am going to need.
I am only intrested in switches 1-4.
Switches 1-2 are for the current setting, 100%, 75%, 50%, 25%.
Is this a case of 3.00amps, 2.25amps, 1.50amps, 0.70amps, or does the board self sence the current and when at idle or hold, hold the current at said % of the stepper motors max current.
Next is Switchts 3-4 for the Buffer, the manual just has, Fast, 25%, 50%, Slow, so at a guess I need to set it to Fast.
Then the last two switches 5-6 are for the step modes, this I understand.
If you look at the datasheet here , pages 9 and 10 you will see that switches 1-2 are the torque current settings relative to maximum current(default 100%) and switches 3-4 are the Decay Modes (default I suspect should be fast). The max current is actually set by the big resistors on the board, but its hard to tell what colour the stripes are, should be Brown, green, silver, silver which is 0.15ohm for 3.3A.
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Re: eBay TB6560 Stepper Motor Driver Boards
irving2008: Thanks for your reply, I have just been hunting around the net to see if I can find better pictures.
So far all I have been about to find are thease two pictures.
http://www.savebase.com/InfoBase/MEG...5/001455_1.jpg
http://www.savebase.com/InfoBase/MEG...5/001455_7.jpg
To me it looks like the current sence resistors are, Brown, Brown, Silver, Gold, 0.11ohm 5%.
If that is right we are looking at 4.5A.
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Re: eBay TB6560 Stepper Motor Driver Boards
Well the board has just this sec turned up.
I was worng about the current sence resistors, they are infact, Orange, Orange, Silver, Gold, 0.33ohm 5%, so thats a current limit of 1.51amps.
I have not done any testing yet, so I will report back with how I get on.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Well the board has just this sec turned up.
I was worng about the current sence resistors, they are infact, Orange, Orange, Silver, Gold, 0.33ohm 5%, so thats a current limit of 1.51amps.
I have not done any testing yet, so I will report back with how I get on.
That makes little sense... probably worth measuring them. Look forward to hearing your verdict....
How long did they take to arrive in the end?
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Re: eBay TB6560 Stepper Motor Driver Boards
It was ordered on the 27/10/2009, and posted on the 28/10/2009, and got here today 10/11/2009, so two weeks to the day from ordering.
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Re: eBay TB6560 Stepper Motor Driver Boards
Well with not quite knowing what is going on with regards to the current sensing resistors I tought it would be best to test how much current the board is pulling.
I am using a bench PSU with a clean adjustable voltage output, the PSU shows me the set voltage and current load.
I have preset the PSU to 13.8volts.
The board by it's self with no stepper motors connected is pulling 0.20a.
Here are the reading with just one stepper motor connected, with the board set to enable and motors at idle.
DIP Switches 3-6 are set to ON.
Bipolar Parallel
DIP Switches 1-2
ON/ON: 1.23a - 0.20a = 1.03a total /2 = 0.51a per phase.
OFF/ON: 0.76a - 0.20a = 0.56a total /2 = 0.28a per phase.
ON/OFF: 0.46a - 0.20a = 0.26a total /2 = 0.13a per phase.
OFF/OFF: 0.25a - 0.20a = 0.05a total /2 = 0.02a per phase.
Bipolar Series
DIP Switches 1-2
ON/ON: 2.10a - 0.20a = 1.90a total /2 = 0.95a per phase.
OFF/ON: 2.10a - 0.20a = 1.90a total /2 = 0.95a per phase.
ON/OFF: 1.05a - 0.20a = 0.85a total /2 = 0.42a per phase.
OFF/OFF: 0.40a - 0.20a = 0.20a total /2 = 0.10a per phase.
All the readings are aprox.
Now I am even more confused then when I started. :confused:
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Well with not quite knowing what is going on with regards to the current sensing resistors I tought it would be best to test how much current the board is pulling.
I am using a bench PSU with a clean adjustable voltage output, the PSU shows me the set voltage and current load.
I have preset the PSU to 13.8volts.
The board by it's self with no stepper motors connected is pulling 0.20a.
Here are the reading with just one stepper motor connected, with the board set to enable and motors at idle.
DIP Switches 3-6 are set to ON.
Bipolar Parallel
DIP Switches 1-2
ON/ON: 1.23a - 0.20a = 1.03a total /2 = 0.51a per phase.
OFF/ON: 0.76a - 0.20a = 0.56a total /2 = 0.28a per phase.
ON/OFF: 0.46a - 0.20a = 0.26a total /2 = 0.13a per phase.
OFF/OFF: 0.25a - 0.20a = 0.05a total /2 = 0.02a per phase.
Bipolar Series
DIP Switches 1-2
ON/ON: 2.10a - 0.20a = 1.90a total /2 = 0.95a per phase.
OFF/ON: 2.10a - 0.20a = 1.90a total /2 = 0.95a per phase.
ON/OFF: 1.05a - 0.20a = 0.85a total /2 = 0.42a per phase.
OFF/OFF: 0.40a - 0.20a = 0.20a total /2 = 0.10a per phase.
All the readings are aprox.
Now I am even more confused then when I started. :confused:
Measure the voltage across each phase... I suspect only one phase is energised when the motor is idling so your "/2" is wrong... what motors are these and what DC resistance?
At a guess I'd say your parallel and series figures are swapped. Again whats the DC resistance across A+ & A- in each mode?
Also remember that the chopper current limiting will regulate peak currents. A 1.5A nominal peak will show up as a 1.5/sqrt(2) RMS current on an analogue meter, i.e. about 1A. It doesnt make a lot of sense unless the resistance of the motors is such that the figure should have been higher on the 100% setting but would need more volts (anything higher than 5ohms would not get to the expected 3A peak - 2.2A rms - current limit on 13.8v, would need 24v)
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Re: eBay TB6560 Stepper Motor Driver Boards
I am using Astrosyn MY103H702 stepper motors <click link for datasheet.
I will do the other tests shortly.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Same motors I have.
I was wondering if the switches are actually adjusting the idle current when the motor is stationary and not the operating current, the data sheet isnt clear. If that was the case then the 100% setting corresponds to the RMS phase current set by the resistors which would be the RMS current shown by the ammeter
The maximum peak current this could be for these motors on 13.3v (allowing .5v for Vref) is:
Unipolar: 13.3/6.2 = 2A (which appears to be your bipolar series setting)
Bipolar Parallel 13.3/3.1 = 4A
Bipolar Series 13.3/12.4 = 1A (which appears to be your bipolar parallel setting)
Do you have a stand-alone ammeter or a 'scope?
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Re: eBay TB6560 Stepper Motor Driver Boards
I have tested the voltage outputs from both phases, and they are both powered wile at idle.
Bipolar Parallel: 4.00 to 4.15volts.
Bipolar Series: 12.95 to 13.00volts.
I do have a DVM with ammeter but it is quite old so don't know how good it will be.
I also do have a PicoScope 2202 USB Oscilloscope.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
I have tested the voltage outputs from both phases, and they are both powered wile at idle.
Bipolar Parallel: 4.00 to 4.15volts.
Bipolar Series: 12.95 to 13.00volts.
I do have a DVM with ammeter but it is quite old so don't know how good it will be.
I also do have a
PicoScope 2202 USB Oscilloscope.
Easiest way to verify the current is to plot the voltage across the sense resistors. If you have the latest PicoSoft 6 software it will, if I recall right, calculate the RMS and peak currents for you (I have a Pico3205 scope), or you can easily work it out...
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Re: eBay TB6560 Stepper Motor Driver Boards
I am running PicoScope v6.3.4.0.
I have not had this scope long so I am still finding my way around the settings, so I am not 100% sure what you are after.
Bipolar Parallel:
True RMS Avg 120mv.
Peak to Peak Avg 1.15v
Bipolar Series:
True RMS Avg 80mv.
Peak to Peak Avg 30mv.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
I am running PicoScope v6.3.4.0.
I have not had this scope long so I am still finding my way around the settings, so I am not 100% sure what you are after.
Bipolar Parallel:
True RMS Avg 120mv.
Peak to Peak Avg 1.15v
Bipolar Series:
True RMS Avg 80mv.
Peak to Peak Avg 30mv.
1.15v peak over .33 ohm = 3.5A peak, RMS = .36A
80mV over .33ohm = 0.24A, but the peak looks low, sure it wasnt 300mV?
Can you post the waveforms?
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Re: eBay TB6560 Stepper Motor Driver Boards
Sure I can save the waveforms, do you want them as screenshots or save the waveforms to an output file?
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3 Attachment(s)
Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Sure I can save the waveforms, do you want them as screenshots or save the waveforms to an output file?
I usually do screen capture or print as PDF.
Attached are 3 captures from my L297/L298 board using the same motor at 500, 750 and 900 steps/sec on a 36v supply, wired bipolar parallel (coil resistance = 3.2ohm).
This shows the A-enable signal (blue) and the sense voltage (red). The sense voltage is directly proportional to the current in the coil (x 2), so .5v = 1A. At 500stesp/sec the RMS voltage is 0.64v, a current of 1.3A RMS, the peak voltage being 0.9v equivalent to 1.8A. You can see that the current doesn't start to flow (indeed its negative slightly at the start of the cycle which is due to the back emf/collapsing field of the previous cycle) until 0.7mS into the cycle, it then ramps up due to the inductance of the coils (these being high inductance motors i.e. not very fast) until it finally gets to the current limit and the driver goes into chopping.
At 750stesp/sec the RMS current has dropped to about 1A, the peak still being 1.8A. This is because the initial start-up and ramp is a greater proportion of the cycle time.
At 900steps/sec the current never gets to the set limit before the cycle ends... this is the fastest the motor will go at this voltage and the power output wil be low, the RMS current here is about 0.5A.
To go faster with these motors needs about 70v...
Setting Vref using the scope like this is much more accurate than adjusting it statically or relying on the overall current consumption.
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Re: eBay TB6560 Stepper Motor Driver Boards
This board is ment to be rated upto 36vdc, So I tried using my 36vdc 10A PSU.
I set the board to it's lowest current setting on the DIP switches to make sure I did not burn out or over heat my stepper motor, I am only testing X-Axis atm.
Powered up the board, and all the lights and the fan came on, Turned it all off and, when I next turned it back on, I was greated with a nice pop / bang, with sparks, and blue / white smoke.
Part of the Z-Axis TB6560AHQ had exploded, Oh Joy.
I have since looked at some of the datasheet for the Absolute Maximum Rating.
L7812CV - 35 Volts Absolute Maximum Rating.
L7805CV - 35 Volts Absolute Maximum Rating.
TB6560AHQ - 40 Volts Absolute Maximum Rating.
I will post a pic of the poor TB6560AHQ chip once I have uploaded it to my site.
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1 Attachment(s)
Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
This board is ment to be rated upto 36vdc, So I tried using my 36vdc 10A PSU.
I set the board to it's lowest current setting on the DIP switches to make sure I did not burn out or over heat my stepper motor, I am only testing X-Axis atm.
Powered up the board, and all the lights and the fan came on, Turned it all off and, when I next turned it back on, I was greated with a nice pop / bang, with sparks, and blue / white smoke.
Part of the Z-Axis TB6560AHQ had exploded, Oh Joy.
I have since looked at some of the datasheet for the Absolute Maximum Rating.
L7812CV - 35 Volts Absolute Maximum Rating.
L7805CV - 35 Volts Absolute Maximum Rating.
TB6560AHQ - 40 Volts Absolute Maximum Rating.
I will post a pic of the poor TB6560AHQ chip once I have uploaded it to my site.
Can you turn down the power supply? Mine goes down to 32 and up to 40v. it could be that back-emf from the motor had damaged the chip by spiking the supply - I'd limit that board to a 30v supply if it has regulators on-board unless they have an additional dropping zener diode in series. On my board you can see spikes of 65v on deceleration, so I have a snubber (basically a 36v zener and a low ohm resistor) across the supply. Another solution, shown in the attached schematic uses a transistor to the same effect...
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Re: eBay TB6560 Stepper Motor Driver Boards
Here is a pic of what is left of the chip.
http://www.mad-professor.co.uk/Misc/...AHQ%20Chip.jpg
My 36vdc PSU is not adjustable.
I now need to start looking at ways to limited the voltage and spikes.
I was looking at using a zener diode and Metal Oxide Varistor to deal with the spikes.
But I still have to look into it more.
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Re: eBay TB6560 Stepper Motor Driver Boards
Thats pretty impressive... any collateral damage as far as you can tell? I'd strip the chip off the board and then retest on the 13v supply and confirm other voltages are as expected...output of regs, logic levels, etc. and compare the voltages on equivalent pins of the remaining drivers - without motors attached.
No point in replacing it if there is more damage...
Alternatively you could send it back...
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Re: eBay TB6560 Stepper Motor Driver Boards
I have removed the damaged chip, and have powered it using my adjustable bench PSU, all the lights came on, no more smoke.
So it looks like only the one chip got damaged.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
irving2008
Can you turn down the power supply? Mine goes down to 32 and up to 40v. it could be that back-emf from the motor had damaged the chip by spiking the supply - I'd limit that board to a 30v supply if it has regulators on-board unless they have an additional dropping zener diode in series. On my board you can see spikes of 65v on deceleration, so I have a snubber (basically a 36v zener and a low ohm resistor) across the supply. Another solution, shown in the attached schematic uses a transistor to the same effect...
Hi Irving,
That snubber circuit is very interesting... It's just what I need. I'm running one of those 50V power supplies that Kip found in "unregulated" mode at 43V. My drivers will smoke at 50V, so I'm nervous.
Can you point me towards any online material that would help size the components to dissipate the sort of spikes I'm likely to see?
Sorry to hijack! (maybe Irving's tip will save a few more driver boards... :)
Tom
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Tom
Hi Irving,
That snubber circuit is very interesting... It's just what I need. I'm running one of those 50V power supplies that Kip found in "unregulated" mode at 43V. My drivers will smoke at 50V, so I'm nervous.
Can you point me towards any online material that would help size the components to dissipate the sort of spikes I'm likely to see?
Sorry to hijack! (maybe Irving's tip will save a few more driver boards... :)
Tom
Tom,
Yes, sadly I wasnt able to find an easy way to turn the volts on those down as they do some strange things with the internal reference line that doesn't follow the application note for the chip they use. I managed to blow one up quite spectacularly!
When I said zener diode I really meant a transient suppressor diode (transorb), such as these from Vishay. But i think clamping to 50v from a 43v supply might be tricky. A zener will clamp, but wont catch transients. you could use a 47v zener as a clamp with a 48v transorb in parallel to catch spikes, with a series low ohm resistor as a current limit between the supply rails. Farnell sell the transorbs, about 30p a go.
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Re: eBay TB6560 Stepper Motor Driver Boards
Hows it going with that board then Mad professor? any joy with it yet?
I've now got exactly the same board and motors sitting on my table, i'm just waiting for my pci parallel port extension to turn up so i'm dying to find out how much money wasted/saved
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Re: eBay TB6560 Stepper Motor Driver Boards
Dan Brown: I have not done any more testing since after removing the damaged chip.
I have tested that all the other axis are still working using my adjustable bench power supply, but I can only run the board / motors upto 15volts on this power supply.
But at this lower voltage my current rig is very slow, max of 200mm/min, for the very short time that the board was running at 36vdc I was closer to 450mm/min rapid move, not cutting.
I will be back to testing the current sence resistor and dip switches.
When using my scope with my bench PSU I always have to use my laptop on battery, as if the laptop on mains or a PC is used I get very strange readings on the scope software, so thats something else I have to look into.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Dan Brown: I have not done any more testing since after removing the damaged chip.
I have tested that all the other axis are still working using my adjustable bench power supply, but I can only run the board / motors upto 15volts on this power supply.
But at this lower voltage my current rig is very slow, max of 200mm/min, for the very short time that the board was running at 36vdc I was closer to 450mm/min rapid move, not cutting.
I will be back to testing the current sence resistor and dip switches.
When using my scope with my bench PSU I always have to use my laptop on battery, as if the laptop on mains or a PC is used I get very strange readings on the scope software, so thats something else I have to look into.
As per my thread above, on 36v the max step rate for these motors is 900steps/sec, thats 270rpm or about 500mm/min on a 2mm pitch screw.
Sounds like you have some ground loop problems. Make sure stepper PSU and scope/PC are on same power socket so they are earth referenced together. I cant use the same PC as the scope and the driver for the stepper, for the same reason...
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
irving2008
When I said zener diode I really meant a transient suppressor diode (transorb), such as
these from Vishay. But i think clamping to 50v from a 43v supply might be tricky. A zener will clamp, but wont catch transients. you could use a 47v zener as a clamp with a 48v transorb in parallel to catch spikes, with a series low ohm resistor as a current limit between the supply rails. Farnell sell the transorbs, about 30p a go.
Thanks Irving!
That's just the right amount of info... I REALLY don't want to smoke these drivers, so I feel some internet research, followed by electrickery, coming on....
There's time because I'm not cutting in anger yet - just aligning, and debugging....
Cheers,
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Re: eBay TB6560 Stepper Motor Driver Boards
Today I have been able to find some free time to do some basic current testing using my bench power supply, and USB Oscilloscope.
Using the oscilloscope across the current sence resistor I get the following results.
Bipolar Parallel
DIP Switches 1-2
ON/ON: 0.469v avg / 0.33ohm = 1.421a.
ON/OFF: 0.313v avg / 0.33ohm = 0.948a.
OFF/ON: 0.234v avg / 0.33ohm = 0.709a.
OFF/OFF: 0.078v avg / 0.33ohm = 0.236a.
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
Mad Professor
Today I have been able to find some free time to do some basic current testing using my bench power supply, and USB Oscilloscope.
Using the oscilloscope across the current sence resistor I get the following results.
Bipolar Parallel
DIP Switches 1-2
ON/ON: 0.469v avg / 0.33ohm = 1.421a.
ON/OFF: 0.313v avg / 0.33ohm = 0.948a.
OFF/ON: 0.234v avg / 0.33ohm = 0.709a.
OFF/OFF: 0.078v avg / 0.33ohm = 0.236a.
That looks about right... i assume by average you mean RMS, so the peak current will be around 2A. Can you post waveforms as discussed?
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Re: eBay TB6560 Stepper Motor Driver Boards
Hi everybody, I'm just another new (and perplexed) user of the TB6560 board. (I'm from Italy, so forgive me for my bad english)
Due to lack and inaccuracy of the documentation available for the board, I've searched around and come by chance to this forum, where I've luckily found answers to some of my doubts and saved some chip-smoking (up to now...) thanks to many intrepid experts that shared their experiences. Kudos to you all.
Now, I've started to test the basic functions of the board (a blue 3-axis HYU68 from Ebay) with 3 NEMA-23 2A motors, 24V supply, just testing the basic signals on the 15-pin port (no parallel connection at this time)
The first problem I've encountered is that the pinout table shown on the manual seems to be wrong, with pins 9 to 15 reversed left to right, like if someone has correctly counted pins 1 to 8 of top row and then continued to count the numbers of second row backwards instead of going back to "new paragraph" as is customary on Cannon-type connectors. I say this because I've found the expected 5V and GND on pin 9 and 10 respectively, instead of 15 and 14 as stated in the manual. (the order of the top row 1-8 appears to be correct)
Did someone else notice this? (and also eventual other mismatches on the 25-pin parallel port?)
Thank you for any suggestion
Roberto
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1 Attachment(s)
Re: eBay TB6560 Stepper Motor Driver Boards
Yes and do not not even once go over 24V with nema23 steppers or
you can put out the frying tonight sign just like my bit of electronics did.
Attachment 2091
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Re: eBay TB6560 Stepper Motor Driver Boards
Yes there is an error in the manual for the pin outs to the motors but the board silk screen is correct on my board as supplied.
My board came with a parallel cable for the PC and it seemed to all work after configuring the I/O on Mach3 to the settings that came in the chinglase manual! The problem I found was that the DIP settings for the microsteps was not correct. The 1/8 step was reversed with 1/16, a fairly minor problem but still irritating as I had a scaling error on movement until I figured it out.
I managed to buy the correct 2 mm spacing headers and crimps for the limit and eStop input on these boards if anyone is interested. I have a few spare that I can post at mininal cost.
John
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
Originally Posted by
CAD_Rickosz
do not not even once go over 24V with nema23 steppers or
you can put out the frying tonight sign just like my bit of electronics did.
Hi. Great thread! v interesting to read. Thank you guys for sharing.
My Question: Is it possible to establish the cause of the exploding chip? and how to prevent any future damage?
........1. Back EMF caused it?
..................could it be the board has insufficient protection
..................maybe additional protection should be added - as described by irving2008 in this thread
........2. Something fries when a PSU of >24v is used?
or some other reason?
Surely too higher voltage from the PSU would have damaged the chip there and then?
Does the delay in chip exploding (ie when next turned on) hint at back emf damaging it during motor rundown or at the end of last run and that damage only apparent when you next turned the device on and it exploded?
PS. Anyone in the M25 with a CNC set up that I can come around and admire / ask a few questions about their implementation of driver board vs software and motors? Im a newbie starting out. I'll happily pay you for your time in beer!
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Re: eBay TB6560 Stepper Motor Driver Boards
I don't really understand this as the actual Toshiba TB6560 chips have an absolute max VmA and VmB voltage rating of 40 volts and the operating rage is up to 34 V. Since it was the chip that blew and not something else on the board then I can see it was a pure over voltage problem providing your PSU was putting out less than 40V but preferrably less than 34 V. The Chinese data sheet for the whole circuit board states a voltage range of 16 to 24V for NEMA 23 spec steppers and 24 to 36V for NEMA 34 steppers. I don't really understand why there is a difference in voltage stated for NEMA 23 and 34 providing the current limit DIP switches are set so as not to exceed the particular Stepper motor current per phase for your wiring configuration (series or parallel). The power supply voltage selected just defines how quick the current limit value is reached for each pulse as it is driving an inductive load.
The when the current pulse is turned off the inductance of the winding tries to maintain current flow so generates a large reverse voltage. The protection diodes are there to clip this reverse voltage and absorb the current from the motor in discharging the winding inductance.
The larger your winding inductance the slower it will be before the current limit is reached when applying a pulse causing reduced speed and torque and also causes a bigger turn off reverse current as the inductance stores energy.
A good fast stepper will have low inductance and series resistance.
What is you stepper motor specifications Resistance, Current rating and Inductance in the wiring configuration you are using?
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Re: eBay TB6560 Stepper Motor Driver Boards
Quote:
The when the current pulse is turned off the inductance of the winding tries to maintain current flow so generates a large reverse voltage. The protection diodes are there to clip this reverse voltage and absorb the current from the motor in discharging the winding inductance.
So is it that Mr ChinaMan's circuit doesn't provide enough protection be it through poor design or poor component choice