Re: first connection of my RAMPS V1.4 November 11, 2015 01:13AM |
Registered: 8 years ago Posts: 53 |
Re: first connection of my RAMPS V1.4 November 11, 2015 09:30AM |
Registered: 11 years ago Posts: 469 |
Re: first connection of my RAMPS V1.4 January 12, 2016 01:07PM |
Registered: 8 years ago Posts: 6 |
Quote
Dust
You need a voltmeter to measure the voltage over the sense resistor, from the voltage you can work out the current.
The current sense resistors should be 0.1Ω
You need to know the current rating of your stepper motors.
Let say for this example you have 1.7amp stepper motors
Normally you only want to run about 70% of max current
The maths is Vref = I_TripMax / 2
Vref = (0.7 x 1.7A) / 2 = 0.595V
With the trimpot normally anti clockwises turns down the voltage and clockwise turns up the voltage, a good trimpot will have about 270 - 310 degrees of movement and physical stops to stop movement. Cheap ones will not and can turn right around.. do not spin them around and around, its pointless and can damage them.
You need to put the probes as pictured. (One probe on the trimpot, the other on negative.)
NB you do not need 12v on while doing this, is best if its off. That way you cant accidentally short 12v to anywhere its shouldn’t be.
Just power the mega from the usb plug. and Leave the ramps un powered.
So adjust and re measure and repeat, till you have the correct voltage.
And ill repeat, you really need a non conductive screwdriver here... a metal one you can short things and kill the driver.
Re: first connection of my RAMPS V1.4 January 12, 2016 05:05PM |
Registered: 8 years ago Posts: 53 |
Re: first connection of my RAMPS V1.4 January 13, 2016 03:09AM |
Admin Registered: 13 years ago Posts: 7,005 |