Okay for nema 17's, Pibot drivers no good for nema 23's unfortuntely. Have had a set of these and lost steps randomly only with the 23's, fine for smaller stuff.
Hi,Jonny Norris,thank you for your feed back, what is the motor model you use? how about the current? you need to adjust the currect for the motor sorry for the trouble
No problem bud, 2.5nm which require 3a unipolar 4.6a parrallel. They might be ok with the 1.7nm version. Problem with the non mosfetdrv drivers is they are all rated on max current ie Pibot state 4.5a what they actually output is more like 1.6a per channel. Had mine wound right up.
You can find an article on it here, it's a bit product orientated but covers the issue. http://www.ruggedcircuits.com/the-motor-driver-myth I've since changed to mosfet drv bridge type drivers and the difrence is substantial.
Do you really have used the Driver Rev2.2 from PiBot Designed? What do you mean "Have had a set of these and lost steps randomly only with the 23's, fine for smaller stuff."? Do you mean you have set of "PiBot driver Rev2.2" or you just mean you have "some driver such as tb6560 tb6600 from ebay." I don't have the tb6600 or tb6560 from ebay, so I don't know what their performce. Since Rev1.6(opensource) we thanks for lots of people feedback, then improve our design again and again. For desgined a drvier board, the chips choose is importan, but the PCB designed important too. Every Each element and the layout parameters was carefully calculated by our engineer. We are Continuous improvement through user feedback. About the nema23, some user use this type of motors -- http://www.bzt-cnc.de/index.php?cat...104&option=com_virtuemart&vmcchk=1&Itemid=104 and use the PiBot Driver Rev2.2 http://www.pibot.com/pibot-stepper-driver-rev2-2.html. It work good, So if you have the problem plesase send your motor parameter to us and please send me your order number. And also thank you for your information about the design, we will check it. Thank you.
No I was using the Rev 1 version with your grbl bob. I believe you have added support for both 3 and 5v logic. Have you upgraded the current output on the Rev 2? I couldn't give you an order number as they came as part of a kit with my ox I'm afraid. I think Pibot need to back up thier claims that they are compatatible with nema 23's by proving that the stated max current (the correct current required to run the 2-3nm nema 23's) is repeatable without fade or thermal shut off. And also specify which nema 23's they may or may not be compatable with, as the largest nm versions are well beyond the capacity of these drivers.
It can not driver ALL the Nema23, there are lot of Nema23 in the world, difference parameter for each model of Nema23. But we help many peoples connect with their nema23 motor for example： http://www.bzt-cnc.de/index.php?cat...104&option=com_virtuemart&vmcchk=1&Itemid=104
