Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Pico on January 08, 2013, 11:16:49 AM
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I have installed a 4th axis motor to be used as an extruder, converting to a 3d printer. The controller is Hobbycnc , which works fine, but I cannot get the 4th axis motor to work. The DRO and hot keys move but the motor does not. The motor is getting hot, so it's getting current but is too hot to the touch, so I think it is wired incorrectly. The motor is a Sanyo 2 phase stepper 103H5208-10U41 nema 17. Any ideas about how I can solve this problem? Thanks, Pico
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if the motor is getting too hot, turn the vref down. Maybe your running too high of current for it. the dro moving and the motor not, kinda tells me you dont have the pins correctly defined for that axis, or the signal isnt getting to it.
John
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Thanks for the advice! I reduced the Vref to half of the other motors, which were twice as large and the temperature is about the same as them. I found a mistake in the ports and pins menu, I swapped the step pins and ports values. Now they are correct: A step =pin 9, A Dir= pin 8 and step and dir port both = 1. Still no movement in the motor. Back tto fiddling around with the wiring to the terminal. Pico
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To make sure its not still ports and pins issues set the X axis to the same ones as the 4th and vice versa and see if the X still works and 4th still doesnt.
Hood
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Good idea. I swapped the Z and A axis values out and was able to jog the Z axis with the A axis but not the other way. So must be something, possibly how I wired the 4th axis conversion. I look at that tomorrow. However, I changed the values back and now I can't jog at all, the resume and jog off/ on is green. Any ideas? Sometimes this thing drives me nutz. Thanks, Pico
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Can only think you have not set them back correctly.
Do the DROs still move?
Hood
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DROs work and now it jogs, after turning off and on. I am going to look to see it I made any solder bridges when building the kit, also looking at motor to terminal connections. Thanks, Pico
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I am attempting to make certain my motor to terminal connections are correct. I have tried many combinations and not gotten it right yet. One problem is that data on the stepper motor, a Sanyo Denki 103H5208-10U41 is lacking. What is the A,A com, a and B, B com, and b ? Here is an image of the colors of the leads from the motor. Thanks, Pico
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Maybe this will help, link to data sheet on that motor
http://www.interinar.com/public_docs/Sanyo_Denki_103H5208-10U41.pdf
That says its a 1.2 amp motor so adjust your vref accordingly.
The black and white wires are the commons. so they both go to the COM terminal, A and a , B and b are for the separate coils, only trying will get it right but you could use Orange and Blue as your A and a and Red and Yellow as your B and b.
John
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I've seen the spec sheet. I have connected the A motor leads to the Z axis terminal. Orange to A white to common,blue to a, red to B, black to common, yellow to b. Although Z works fine, it can't move the A motor. I have checked the amperage between leads, it is 5.7 between orange and blue ends, with 3.7 between blue end and white common, and 4.7 between orange end and white common. On the B side, it was 4.7 between yellow and red ends and 1.3 between yellow end and black common and 3.7 between red end and black common. The amperage on that motor is adjusted a bit below 1. Thanks, Pico
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weird resistances to read, if thats what you meant. Maybe thats a bad motor.
John
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Could it be that the driver and motor are not compatible? The motor spec sheet recommends drivers BSD-01P, BSD-13G, BSD-02,and BSD-02LH. My driver is SK Japan SLA 7078MR 1303 P. Thanks, Pico
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I have an A motor problem. I wired the Z motor to the A terminal and got some humming, turned up the Vref and got movement. Thanks for the advice. Pico
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I'm back with several other problems, as usual. I have replaced the motor with a Lin Engineering 5718M-02E-03. It's wires are: A blue/white, C red/white, A(with a line over it) blue, C(with a line over it)red, B green/white, D black/white, B(with a line over it) green, D(with a line over it) black. I'm assuming that the letters with the lines over them are the small letters; is that correct? The Cs are obviously the common and am I correct in assuming the Ds are also common? But here is the big problem: I wired this A axis into the controller, jogged the other 3 axis, which worked fine , tried the A axis, the dro functioned but the motor didn't turn. But then I tried the other 3 axis again and they didn't work, either, yet the dros function. Not certain where to go from here. In a thread called " mystery motor loss", Hood suggests that working dros and non working motors may be the result of a parallel port out. How do I diagnose that? Thanks, Pico
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I have found a reference for writing the terminal of my Hobbycnc 4th axis to my stepper motor. It is: A blue/white, a red, common blue and red/white, common black/white and green, b green/white, B black. Any comments? Thanks, Pico
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Frankly i never trust the motor color coding and always confirm it.
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So 1-2 and 2-3 should have equal resistance and 1-3 should be greater and equal to their sum.
Actualy one should measure inductance if they have an appropriate meter to do so.
if you do not have a meter:
You touch 1-2 and you will feel the resistance when trying to turn the motor shaft by hand. If you touch 1-3 the resistance to
to turning will be greater. When doing this the other wires should not be touching. If you find continuity between coils the motor
is bad.
Above done with no power to the motors from the drive. Don't go measuring amperage, voltage from the drive to the motors as you can blow a drive.
Now make note of the color coding.
Do the same for the other side. The amperage is set based on how the motor is wired. Go to the Gecko site and read the info
about current setttings for different motor wiring configurations.
Suggest you just set the amp for 0.5 amps. Didn't see the manual for your drive so read the manual on how to set the amp rating.
May want to set the microstepping to 10us.
RICH
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RICH< Thanks for the advice, I've checked the new motor, wired it to the Z axis, which I knew worked properly, to test it; it turned. Then wired it to the A axis and it turns, also. Problem solved, now onward to 3d printing. Pico