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View Full Version : How to connect my driver to my steppers


speedhound
15-01-2011, 09:53 PM
Im just about to connect my stppers to my drivers, but am not sure what is what as the connections are labled 1a 1b 2a 2b, how does this relate to a+ a- b+ b-. the instructions say "First phase connected between 1A and 1B
and the second phase connected between 2A and 2B".

Thanks
Jonathan
15-01-2011, 10:21 PM
You need to connect one par of coils (or phase) between 1a and 1b and the other to 2a/b. Whether or not you put the coils in series or parallel depends on your drivers/motor. If the a+ and a- are your motor wires(?) then they connect to 1a/b on the driver (doesn't matter which way round, that only reverses the motor rotation direction).


If you're not sure then post what motors and drivers you have so I can help you more precisely.
speedhound
15-01-2011, 10:34 PM
Hi, thanks for reply, im pretty sure i know what you mean but i have sigma 8 wire motors which i have wired in parallel, to give me a+-b+- and these boards http://www.routoutcnc.com/10asingle.html .
Jonathan
15-01-2011, 10:37 PM
Hi, thanks for reply, im pretty sure i know what you mean but i have sigma 8 wire motors which i have wired in parallel, to give me a+-b+- and these boards http://www.routoutcnc.com/10asingle.html .

Current isn't a problem with those drivers I see. Shame about the voltage being so low.

If you've allready wired the motors in parallel you can't really go wrong :)
speedhound
15-01-2011, 10:48 PM
yeh i went with the higher amps as the motors need about 8 or 9 i have been told and they are geared 1 to 1 so they need plenty of tourqe, but speed is not a great concern of mine so hopefully it should be ok.

Thanks
Jonathan
15-01-2011, 10:57 PM
I'm guessing they must be nema34 then? Do you have a link to the datasheet out of interest?
speedhound
15-01-2011, 11:17 PM
They are old nema 42s, sorry no data but 34s are more powerful as they have better magnets than the old 42s
Jonathan
15-01-2011, 11:20 PM
They are old nema 42s, sorry no data but 34s are more powerful as they have better magnets than the old 42s

Are they off a bridgeport interact series 1? I saw some of those cheap a while ago but wasn't sure...
speedhound
16-01-2011, 10:31 AM
Its an early Bridgeport BOSS they are fitted with steppers but the later ones had servos
stirling
16-01-2011, 02:52 PM
but speed is not a great concern of mine so hopefully it should be ok.
In this case it's worth trying serial rather than parallel