From d8de1c489d2c465bcc0e9cb3fabd7caffcbc3b19 Mon Sep 17 00:00:00 2001 From: Matt Topper Date: Sun, 29 Oct 2023 16:43:54 -0400 Subject: [PATCH] Update 4028.md Adding a note that the Delta THA0412BN actually uses the yellow wire for PWM. That was fund troubleshooting. --- site/docs/guides/4028.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/site/docs/guides/4028.md b/site/docs/guides/4028.md index ecf300cd0..384eefe89 100644 --- a/site/docs/guides/4028.md +++ b/site/docs/guides/4028.md @@ -12,7 +12,7 @@ The black and the red pin are for power, you need to connect these to an always ## PWM -On Delta fans the blue wire is the PWM wire, on Sanyo's it's the brown wire. If you're unsure, refer to your fans datasheet. To control the 4028's the PWM wire is fed a 5V PWM signal from the board. An easy way to do this is to hook it up to the negative terminal of the part cooling fan port (refer to your boards wiring diagram). We need to invert the logic of the fan_part_cooling_pin to generate a PWM signal the fan can understand. You can do that with the following piece of configuration in your user overrides section. +On Delta fans the blue wire is the PWM wire (except on the THA0412BN, where it is the yellow wire), on Sanyo's it's the brown wire. If you're unsure, refer to your fans datasheet. To control the 4028's the PWM wire is fed a 5V PWM signal from the board. An easy way to do this is to hook it up to the negative terminal of the part cooling fan port (refer to your boards wiring diagram). We need to invert the logic of the fan_part_cooling_pin to generate a PWM signal the fan can understand. You can do that with the following piece of configuration in your user overrides section. :::info On boards with fan voltage selection (such as the Octopus boards), the voltage doesn't matter. The selector only changes which source the positive pin is connected to. We don't use the positive pin, we use the negative, which is a mosfetted ground connection.