RESISTOR

[BOBINETTE]

Hi,
I have G203V Geckodrive's and my motors needs 6.1 and 4.3 amps to run, in the owner's manual it give me 282K for 6 amps and 62.67k for 4 amps.
If I do the maths properly i think that the required resistor would be 286.7 and 67.37 Kohm.
First I would like to know if my maths are correct and if so what are the colors coding for the resistors.
Thank you

[john_100]

Hi

the resistor values given in the manual are the nearest 5% resistors
to set the current from 1A to 7A ,in 1/2 amp steps

for 6.1A R in K ohm = (47 x 6.1)/( 7-6.1) = 286.7/0.9 = 318.56 ohms

for 4.3A R = (47 x 4.3)/ (7-4.3) = 202.1/2.7 = 69.69 ohms

the colour code on the resistors will depend on the series the resistors are from

5% resistors fom E24 will have 3 bands indicating the value
2 for the fist 2 digits and then 1 for the multiplier (plus gold for 5% tolerance)

eg 10K = brown black orange gold ( 1 ,0, x 1000 +or -5%)

but a 1% resistor can be 4 or 5 bands to indicate the value


http://www.radio-electronics.com/inf...ding-chart.php


Electronics 2000 | Preferred Resistor Values

Resistor E Series - E3, E6, E12, E24, E48, E96 Tables :: Radio-Electronics.Com

http://samengstrom.com/24614782/en/r...or_Color_Codes

http://samengstrom.com/15924820/en/r...or_Color_Codes






John

[BOBINETTE]

Hi
If I'm understanding this, I would need a 318.56 k ohm for the 6.1 Amp and a 69.69 K ohm for the 4.3 Amp, if so can I round it out at 320 and 70. I think that the four band 5% resistors are the most available around here
Thank you for your help

[john_100]

Hi,

yes in theory thats the resistors you want

but in practice have to compromise and use the E12 range of values

for example use a 68K ohm resistor for the 4.3A motor
or 68K + 10K is series if you use two resistors


and a 270 K ohm for the 6.1 A motor if you use a single resistor
or a 270K and a 47K resistor in series if you use two resistors

you could use a 330K resistor if you decide to go just over 6.1A

John