G540 w/ 8wire stepper running bipolar parallel

[dxhale]

So I have been racking my brain and have spent an endless amount of time searching trying to find an answer to my question which is... How do I run my 8 wire steppers bipolar+parallel?

My steppers are purchased from hobbycnc (#23-305-DS8A) which I have 4 of.

Also I am looking at getting a new power supply... So if I have interpreted the information correctly running these steppers @ bipolar+parallel will require 4.2amps each which means 4.2*4*.67 = 11.256. So a 10amp power supply should suffice right? I have also read that if a motors inductance is greater than 5 (which running these steppers bipolar they would be) I should only go with a 36V max power supply.

Any help to clear up my confusion would be greatly appreciated.

Thanks,
Jason

[H500]

Do you have datasheets for the motors?

[dxhale]

Here is the only info that I could find on it.

Thanks

[ger21]

Yes, a datasheet would help with the bipolar parallel wiring.

So if I have interpreted the information correctly running these steppers @ bipolar+parallel will require 4.2amps each which means 4.2*4*.67 = 11.256. So a 10amp power supply should suffice right?

Well, no, but yes. You did the math which said you need 11.2amps, so 10 is not really enough. But in most cases it probably would be.
However, the G540 can only supply 3.5 amps, so 3.5*4*.67 = 9.38amps, so 10 is fine.
Also, I've heard that the G540 has a 7 amp fuse, so it never uses over 7 amps.

Power supply max should be 32*sq rt of inductance. Which is 71 volts for an inductance of 5mH.
However, the bipolar parallel inductance should be the same as the unipolar inductance, which should be 3.2. Which = 57 volt supply. Use a 48 volt supply like everyone else does.

[H500]

For bipolar parallel, connect:
coil1
1 red to blue
2 yel to blk

coil2
3 wht to brn
4 org to grn

The inductance is high, so use the max voltage your drive will allow, 50v.

10 amps is enough.

[ger21]

That datasheet doesn't match the info on their website.

[dxhale]

Yea I'm seeing the same thing with the info not matching ;/ thank you all for the information, it has been very helpful.

I'm on a budget right now and cant seem to find a 48v10a cheaper than 100. I did however fine a 36v10A and 48v8.3A for around 50 each. Which one would be the biggest bang for the buck in terms of power ?

[H500]

I would go for the 48v one without hesitation. Your motor inductance is so high that I doubt you will draw anything close to 8 amps.