DRV8825 can output enough current for two NEMA17's?

Hi,

I recently purchased 4 x DRV8825 stepper drivers with my AZSMZ Mini Board.

I plan to make a Z-Splitter cable where my Stepper Motors receive an equal 1.2A (1.2A is their rated current)

On the Texas Instruments site, they say that their stepper driver can handle 2.5A which means that by inputting for my gamma (Z Axis) current: 2.4, I will get an equal 1.2A per Stepper Motor?

However, I asked my seller what the max current was for the DRV8825, and he said it was 1.7A MAX. If this is true, would 0.85A be enough per stepper motor for the Lead screw driven Z Axis?

Thanks! Any feedback will be appreciated

With most stepper motors used in RepRaps, it is better to connect them in series than in parallel. What is the specification of the motors?

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

These Are the specs of my stepper motors:

NEMA17 Stepper Motor 40mm Long, 1.2A

200 steps per revolution (1.8 deg/step)
2 Phase bipolar 4 wires
Rated Voltage 2V DC
Rated Current 1.2A
Phase Resistance: 1.7 Ohm ± 10% (20º C)
Phase inductance: 4.5 mH ± 20% (1kHz 1 V rms)
Holding torque: 0.4 N.m Min.
Shaft diameter: 5mm / 0.188" (3/16")
Shaft length: 22mm
Motor depth: 40mm

In the picture added, is this an accurate representation of wiring in series?

Edited 1 time(s). Last edit at 07/05/2015 02:53PM by InspecteurSpie.

Looks about right to me... I run a Duet(Allegro A4982- max @ 1.7A...I think))

Running 2 NEMA17 in parallel (y formation) I had to max out my driver and it still seemed a bit low. I changed to serial at DC42's recommendation and it seems to be working out a lot better for me.

I also run 1 NEMA23 using a leadscrew for Z motion

The rated current of those motors is quite low at 1.2A, so is the voltage. So either serial or parallel will probably work. Series is less likely to overheat the driver. It's usual to run the motors at 50 to 75 percent of their rated current in RepRaps.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].