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UM2 Stepper wiring pinout

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Hi all,

 

I'm trying to wire up a replacement nema 17 motor, where voltage amps etc are fine.  its just the wire config is different.

 

I have checked the control board schematics, but can't figure out which is -a -b see below

 

1=1b

2=1a

3=2a

4=2b

 

Can anyone tell me which is which please?  im trying to rewire an e3d with the following motor config

 

1=A

3=B

4=-A

6=-B

 

Luke

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