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Motor pulsing
#1
Hello!

Just finished with my miniEngine 2! It was a long road, 2 DOA arduinos, bad display but finally it's working kind of.
At this point it boots normal. But in my stupidness i didn't read the instructions correctly...

I forgot to solder the 3.3volt jumpers on the big steppers. Is this a big problem? As now the stepper motor is just pulsing and doesn't rotate, turning the pot on the big stepper doesn't help it only increases the noise. Maybe i killed the big stepper  Confused

I'll post pictures of the boards tomorrow .
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#2
(10-16-2015, 12:27 AM)Torquednb Wrote: Hello!

Just finished with my miniEngine 2! It was a long road, 2 DOA arduinos, bad display but finally it's working kind of.
At this point it boots normal. But in my stupidness i didn't read the instructions correctly...

I forgot to solder the 3.3volt jumpers on the big steppers. Is this a big problem? As now the stepper motor is just pulsing and doesn't rotate, turning the pot on the big stepper doesn't help it only increases the noise. Maybe i killed the big stepper  Confused

I'll post pictures of the boards tomorrow .

Are you sure that you connected the motors correctly?
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#3
I think i did, but at this point i'm doubting everything... 
Here are the pictures of the boards, i've checked the solderjoints multiple times. 


[Image: DSCF8427.jpg]

[Image: DSCF8426.jpg]
[Image: 2la7nl0.jpg]
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#4
Do you have some documentation for your motor?
I also think you know that you need to connect the data cables (S, D, E) to the main PCB, right?


Cheers 
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#5
(10-19-2015, 03:10 PM)Airic Lenz Wrote: Do you have some documentation for your motor?
I also think you know that you need to connect the data cables (S, D, E) to the main PCB, right?


Cheers 

Hi,

(Yes, i was trying some things everything is connected now)

The steppers i use are nema 17 type, both with 1,8 degree steps. 
[Image: DSCF8430.jpg]

So calibration should be the same for both motors i think. I changed the stepper drivers with new ones, nothing changed. 

I made a small video so you can see whats happening. Power everything up, at this stage the motor shaft is free. When i go in ti the jog menu and change the value the shaft is fixt(as in power is applied to the motor) when i rotate the pot on the big stepper the motor only pulses but there's no rotation. You can hear the sound of the stepper

Stepper problem
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#6
What are the calibration values you use for the motor?
Can you please also try to rewire the motor (42HS40-1704A) to connect to the the board this way: black, green, red, blue.


Cheers,
Airic
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#7
(10-26-2015, 01:04 PM)Airic Lenz Wrote: What are the calibration values you use for the motor?
Can you please also try to rewire the motor (42HS40-1704A) to connect to the the board this way: black, green, red, blue.


Cheers,
Airic

At first i tried the value used in the manual (914.29) because the motors should be the same. My pinion has a circumference of 6 cm so that would give 533.33 this also doesn't work. I connected the wiring in different ways but still the same behavior. 
When i measure at (mot1) i get 3v on E depending on if the motor is enabled, 3v on D depending on the motor direction. That seems to be oke, but when i measure on S i get nothing. At home i don't have a scope so i will try tomorrow at work. It seems the there is no or a wrong output from the arduino. 
Could this be a problem in the software?
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#8
No, it is no problem in the software as it works for me and a lot of other users without any issues. I'd have recognised a non-working motor on a system that is supposed to just control motors Wink

The S pin is supposed to just pulse for 5 to 10 miroseconds per stepper motor pulse. Your multimeter will not be able to measure that. 
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#9
Hello!
I had just assembled the miniEngine ,.. and it's great!
But a have the similar problem. Motor wont turn, it's just locked when I press stat button and it gets hot. If I turn the Pot on easy driver it's start to buzzing louder and gets even hotter. I had change the power supply from adapter to battery, if there were some problems with switching power adapter, and it's all the same. Motors I have are from some epson printer, they should be 7V / 1.8° / 8ohm coil / stepper,.. or is the easy driver which I bought on eBay.

Motor: http://www.motors.wrobots.com/EM-257_17PM-K212-PIT.php
easy driver: http://www.ebay.com/itm/141197792016?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

If anyone have any ideas?
Thanks
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#10
Sounds like the motor phases (the motor cables) are not connected in the correct order. Please connect the motor as described in the attached picture which I created.

   
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