Electronics
Wiring Guide
A step-by-step wiring guide is now available. It covers the installation and wiring of a V-Core 4.0 when using the Standard Kit configuration.
V-Core 4.0 Wiring Guide - BETAWiring the V-Core 4.0 can relieve stress and improve sleep quality. Follow this guide carefully, and take your time to accomplish each step successfully.
Identifying Motor phases
If your motors were acquired at Rat Rig, you don’t need to worry about motor pinout, simply follow our wiring diagrams.If you sourced your motors elsewhere, you need to identify their pinout to avoid damage to the board.You can identify the motor pinout using either a LED diode or a piece of wire. Short two pins like on the example below and then rotate the shaft by hand. When shorting a phase the LED will light up or - if you’re using the wire method - rotating the shaft will become much harder.
![](https://cdn.prod.website-files.com/6465fa9b017ab9d60c77979a/64746c5ace2f02e8bd4aac82_motor_phases.png)
BIGTREETECH Octopus v1.1 Wiring Diagram
The BIGTREETECH Octopus v1.1 is the preferred configuration for the V-Core 4 as it is fully supported by RatOS. Pay close attention to the machine variant, as the stepper motor position is different.
![](https://cdn.prod.website-files.com/6465fa9b017ab9d60c77979a/6672fbb3d69597ba975eda0c_Main-scheme-Official-CoreXY.jpg)
![](https://cdn.prod.website-files.com/6465fa9b017ab9d60c77979a/6672fbb3ff54233f4b8cb95c_Main-scheme-Official-Hybrid.jpg)
Connecting a 4028 Fan
The Rat Rig toolhead uses a more powerful 4028 fan for improved part cooling. To accurately control the fan, additional wiring is required beyond the normal 12/24V and ground. The following article on the RatOS site covers all aspects of using these fans:
Connect a 4028 fan⚠️WARNING! RAT RIG 4028 FANS ARE 12V
Fully read the instructions linked above. Plugging a 12v fan into a 24v printer will destroy your fan.
Mains Power
This guide covers the AC wiring for the V-Core 4,
Before proceeding with any AC 230V wire connections, it is crucial to understand the risks involved. Alternating Current (AC) at 230V / 110V is a high voltage that can cause severe injury or even death if not handled correctly. This type of electrical work is highly dangerous and should only be performed by a licensed professional.By using this guide, you acknowledge the following: