PMDX-126 C, WITH 133, 3 GECKO 203V

[Futurepast]

I have 3 Nema 34 motors. Each motor is rated at 5.6 amps so the manufacturer sent 3 power supplies. How do I wire in 3 supplies?

[Steve Stallings]

For simple linear power supplies, you can simply parallel their outputs.

If the supplies are the switching type, you can probably still wire them
in parallel, but I would try to get a manual on the power supplies to see
if they claim otherwise. In the old days, some regulated switchers
would shut down if another supply was to output a higher voltage on
the same parallel bus. No harm, but you would not get the full benefit
of all the power supplies. Modern units typically do not have this issue.

[Futurepast]

Sorry it's taken so long for me to reply. I've been thinking about it. Hooking them in parallel....If the combined motors have a potential of drawing 15 or 16 amps wouldn't it burn out the 133 MB?

[Steve Stallings]

The nature of stepper motor drivers is for them to accept higher voltage at lower current
and by switching regulation, to output lower voltage at higher current.

Gecko G203V drivers will never consume more than 5 amperes. Indeed, they actually
have a 5 ampere fuse internally.

[Futurepast]

Ok thanks! I'll hook them up and see what happens

[Futurepast]

ok so I wired them parallel, checked the 133 for power on, everything is ok. Now, I'm going through the manuals step by step and I come across this ""instaall the motor current set risister in...". What is that?

The manual needs little boxed info areas marked "rooky user info" to explain some of this stuff:) This is my first build, I'm old, building on a budget, and cratchety.

[Bob at PMDX]

ok so I wired them parallel, checked the 133 for power on, everything is ok. Now, I'm going through the manuals step by step and I come across this ""instaall the motor current set risister in...". What is that?

The G203V drivers need a resistor to set the motor current, unless you want the whole 7 amps. If you look in the Geckodrive G203V manual it tells you how to calculate the resistor value (http://www.geckodrive.com/g203v-rev-7).

Bob