Thread: Stepper motor help...STM5776
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03-12-2018 #11
How is the cable connected at the motor end? Is there a connector? Or are the wires soldered? Does the motor have 4 or 8 wires? If you disconnect it you can check the impedance of each winding with a multimeter on ohm reading and see if you get same values on each pair. Then connect with another cable or 2 cables with 2 wires, anything you may have around.
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03-12-2018 #12
By the looks of it at the rear of the motor there is a black block connected to it which has a single black sheathed cable going through the panelling and straight down to the controller unit.
The wire has 4 strands, black, blue, green/yellow and brown. Black and brown are linked together in the controller, green/yellow and blue are on their own. I've attached a picture of the controller unit so you can see how they enter.
Can I just take the connecter block off and check or does it need to be at the stepper end?
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03-12-2018 #13
Just as a heads up.
Took the Y axis belts off.
The Y axis free wheeled and had no resistance
The shafts did not free wheel however they moved smoothly
No movement in any of the bearings from what I could see
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03-12-2018 #14
Those are not the wires going to the motor but the signal wires going to the drives. The motor wires are connected to the black drives from your first post picture (A+; A-; B+; B-)
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03-12-2018 #15
So this is where I am at. Ive traced the wires back from the motor.....
1 - Wire direct from Y axis motor, Green, Black, Red, Blue which go into White, Brown, Yellow, Green respectively
2 - They then go into this relay RXM 24VDC which Im guessing switches between the Y and the 4th, plug in rotary axis.
3 - The wires then exit and come into the controller
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03-12-2018 #16
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03-12-2018 #17
Could you bypass the relay and connect the motor cable directly to the drive? Blue wire to A+; red wire to A-; green wire to B+and black wire to B-
edit: You can also check the resistance between blue and red and between green and black after you disconnect them.Last edited by paulus.v; 03-12-2018 at 05:31 PM.
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03-12-2018 #18
I guess so yeah, unscrew them from above and below the relay and connect them together. Then turn it on and see if we have the same issue?
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03-12-2018 #19
Insulated crocodile clips and extra wire is going on my Christmas list!
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03-12-2018 #20
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