From c17b61a10f3c99a542c51c8d8c6f08348a9d19af Mon Sep 17 00:00:00 2001 From: jaredairbusaerial <42249132+jaredairbusaerial@users.noreply.github.com> Date: Sun, 13 Jan 2019 17:36:22 -0500 Subject: [PATCH] Improved power connection procedure information --- docs/getting-started.md | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/docs/getting-started.md b/docs/getting-started.md index e0991902..3e2ebf43 100644 --- a/docs/getting-started.md +++ b/docs/getting-started.md @@ -56,14 +56,19 @@ All non-power I/O is 3.3V output and 5V tolerant on input, on ODrive v3.3 and ne ### Wiring up the motors * Connect the motor phases into the 3-phase screw terminals. It is not recommended to use a clip-on connector such as an alligator clip, as this can cause issues with the phase resistance/inductance measurements. -* Connect the power source to the DC terminals. Make sure to pay attention to the polarity. -* Do not apply power just yet. ### Wiring up the encoders Connect the encoder(s) to J4. The A,B phases are required, and the Z (index pulse) is optional. The A,B and Z lines have 3.3k pull up resistors, for use with open-drain encoder outputs. For single ended push-pull signals with weak drive current (\<4mA), you may want to desolder the pull-ups. ![Image of ODrive all hooked up](https://docs.google.com/drawings/d/e/2PACX-1vTCD0P40Cd-wvD7Fl8UYEaxp3_UL81oI4qUVqrrCJPi6tkJeSs2rsffIXQRpdu6rNZs6-2mRKKYtILG/pub?w=1716&h=1281) +### Safety & Power UP +
+ Always think safety before powering up the ODrive if motors are attached. Consider what might happen if the motor spins as soon as power is applied. +
+* Unlike some devices, the ODrive does not recieve power over the USB port so the 24/48 volt power input is required even just to communicate with it using USB. It is ok to power up the ODrive before or after connecting the USB cable. +* To power up the ODrive, connect the power source to the DC terminals. Make sure to pay attention to the polarity. A small spark is normal. This is caused by the capacitors charging up. + ## Downloading and Installing Tools Most instructions in this guide refer to a utility called `odrivetool`, so you should install that first.