Sanyo Step-Syn 103-807-7 Gecko 540 Wire Color Codes

[Wrangler97]

Hello, I have a Terco Milling Machine, it came with sanyo step-syn 103-807-7 motors. They are 1.8 Degree, 1.8 V, 4.8 A. Steppers. They are unipolar six wire with colors White, Black, Brown, Gray, Blue, Yellow/Green, I have searched and found nothing for this. White and Black have continuity. I just got my Gecko Drive in today and would like to wire up my new mill. Any help would be greatly appreciated.

[jschmitt]

you can figure out your leads using an ohm meter. Measure ohms between all of the wires and record the results. You should have 2 sets of 3 wires that have continuity. These sets are your two phases.

Within the each phase 2 of the wires will measure twice the resistance between them as the third will beween the other two. The wire that measures half the resistance is your center tap.

here is a web page to help explain:
Stepper Motors

I would connect the two wires with the most resistance between them to A and /A on the Gecko, then connect the two wires with the most resistance form the other set of three, to B and /B. Make sure to cap the centertaps separately.

This should get you going. If you need more preformance you might try wiring half coil.

[Wrangler97]

I found the center taps and found the firing order. Thanks for the info