<p>You only need to connect one pair (one red, one black) of sufficient wire gauge to the single power connector's plus (red) and minus (black). There is no need to bundle multiple pairs from the PSU. Some pinout graphs are not clear in this respect! I've always connected the heated bed through an external MOSFET to keep large currents away from the board, but according to the design, it is capable of handling the current.</p>

<p>E.g. this is the <strong>correct pinout</strong>:</p>

<p><a href="https://i.sstatic.net/8eASc.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/8eASc.jpg" alt="enter image description here"></a></p>

<p>And this an <strong>incorrect pinout</strong> graph (look at the lower left where the power needs to be connected to the board, this hints to bundling the 11&nbsp;A and 5&nbsp;A wiring):</p>

<p><a href="https://i.sstatic.net/hvqfF.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/hvqfF.png" alt="enter image description here"></a></p>

<p>The part cooling fan should preferably not be connected to a (non-schedulable) 12&nbsp;V header. Instead you should use the <code>D9</code> output connector to schedule the airflow of the fan for part cooling.</p>

<p>Note there is no spare 12&nbsp;V header available on the board. You could use the spare PSU pair to power the coldend (radiator) fan.</p>

CC BY-SA 4.0
2020-02-05T22:25:31.277Z
2020-02-06T07:28:30.940Z
2020-02-06T07:28:30.940Z
0scar
<p>My RAMPS 1.4 board has failed. I bought a RAMPS 1.6 to replace it but :</p>

<ol>
<li><p>The old board had 4 power wires that went to 5&nbsp;A and 11&nbsp;A respectively. The RAMPS 1.6 has only 1 pair of power inputs. Which pair from the PSU do I connect to the board? Or do I combine them and connect them to their polarity respectively?</p></li>
<li><p>I have a cooling fan (12&nbsp;V) for part cooling. In RAMPS 1.4, I had it connected to the pins between the power inputs and the X stepper driver on the board. The RAMPS 1.6 doesn't have such a pair of pins. Is it possible to connect it somewhere else on the 1.6 board?</p></li>
</ol>

CC BY-SA 4.0
2020-02-05T22:05:36.490Z
Hi welcome to 3DPrinting.SE!
0scar
<ramps-1.6>
How to connect power and fan to RAMPS 1.6?
Vasilis Skouras
# How to connect power and fan to RAMPS 1.6?

(Asked by: username_0 on 2020-02-05)

My RAMPS 1.4 board has failed. I bought a RAMPS 1.6 to replace it but :

1. The old board had 4 power wires that went to 5 A and 11 A respectively. The RAMPS 1.6 has only 1 pair of power inputs. Which pair from the PSU do I connect to the board? Or do I combine them and connect them to their polarity respectively?
2. I have a cooling fan (12 V) for part cooling. In RAMPS 1.4, I had it connected to the pins between the power inputs and the X stepper driver on the board. The RAMPS 1.6 doesn't have such a pair of pins. Is it possible to connect it somewhere else on the 1.6 board?

**Tags:** ramps-1.6
> **Comments:**
> **username_1**: Hi welcome to 3DPrinting.SE!  

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## 1 answers

### Answer by username_1 on 2020-02-05. Score: 2

You only need to connect one pair (one red, one black) of sufficient wire gauge to the single power connector's plus (red) and minus (black). There is no need to bundle multiple pairs from the PSU. Some pinout graphs are not clear in this respect! I've always connected the heated bed through an external MOSFET to keep large currents away from the board, but according to the design, it is capable of handling the current.

E.g. this is the **correct pinout**:

[![enter image description here](https://i.sstatic.net/8eASc.jpg)](https://i.sstatic.net/8eASc.jpg)

And this an **incorrect pinout** graph (look at the lower left where the power needs to be connected to the board, this hints to bundling the 11 A and 5 A wiring):

[![enter image description here](https://i.sstatic.net/hvqfF.png)](https://i.sstatic.net/hvqfF.png)

The part cooling fan should preferably not be connected to a (non-schedulable) 12 V header. Instead you should use the `D9` output connector to schedule the airflow of the fan for part cooling.

Note there is no spare 12 V header available on the board. You could use the spare PSU pair to power the coldend (radiator) fan.


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