Modifications

Another way to set the current limit is to measure the VREF voltage and calculate the resulting current limit. The VREF voltage is accessible on a via that is circled on the bottom silkscreen of the circuit board. The current limit relates to VREF as follows:

Another way to set the current limit is to measure the VREF voltage and calculate the resulting current limit. The VREF voltage is accessible on a via that is circled on the bottom silkscreen of the circuit board. The current limit relates to VREF as follows:

{{POLImage|MP6500-04.png|600px|Limitation de courant en fonction de la position du potentiomètre sur le contrôleur MP6500.}}

{{POLImage|MP6500-04.png|292px|Formule permettant de calculer le courant du limiteur.}}

So, the current limit in amps (A) is equal to 3.5 times the VREF voltage in volts (V), and if you have a stepper motor rated for 1 A, for example, you can set the current limit to about 1 A by setting the reference voltage to about 0.28 V. In practice, we have often observed the actual current limit to be about 10% (sometimes up to 15%) lower than what the equation and graph show.

So, the current limit in amps (A) is equal to 3.5 times the VREF voltage in volts (V), and if you have a stepper motor rated for 1 A, for example, you can set the current limit to about 1 A by setting the reference voltage to about 0.28 V. In practice, we have often observed the actual current limit to be about 10% (sometimes up to 15%) lower than what the equation and graph show.