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step stick current draw

Barry_Scott

step stick current draw
April 29, 2012 10:04AM

Registered: 12 years ago
Posts: 23

I have a ramps 1.4 board and 5 stepstick attached.

I am running from a bench power supply at 12.7v but with all the drivers maxed the draw is 0.5 amps with them all running, is this right?

when the hot end starts running the draw jumps to 2.0 - 2.3 amps.

all the drives are cool to cold. i bought the items from reprapworld.

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nophead

Re: step stick current draw
April 29, 2012 12:19PM

Admin
Registered: 17 years ago
Posts: 7,879

Seems a bit low, but it depends on the resistance of the motors. E.g. a 1.65 ohm motor running at 1A will only draw an average current of about 1A * 1.65 / 12.7 = 0.13A from the supply rail.

Edited 1 time(s). Last edit at 04/29/2012 12:19PM by nophead.

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Barry_Scott

Re: step stick current draw
April 29, 2012 04:28PM

Registered: 12 years ago
Posts: 23

yes, you are right,

3.1v and 2.5 amps so the resistance would be 1.25 ohm.

so the maths does work

thanks for you help.