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Did i shorten my ramps 1.4?

Posted by KING2882000 
Did i shorten my ramps 1.4?
November 15, 2016 02:48PM

I just wantet to set the pot on the a4988 stepper drivers. Connected usb for power. One pin on the screw one pin on gnd. Three of the five Steppers gave me a voltage, two didnt. Connected the ramps extander x3 and non of them was working. Disconnected the extander and the three working drivers "died" to. Did i do something wrong? Way to Test the Stepper Drivers if they are damaged?

Edited 1 time(s). Last edit at 11/15/2016 02:50PM by KING2882000.
Re: Did i shorten my ramps 1.4?
November 18, 2016 07:48AM
You need 12V to set vref on the pots.

5V from USB is not good.
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