Prusa Research MMU3 Manual Del Usuario página 128

PASO 9 Conexión de los cables de alimentación
Connect the Power cable fork connectors.
First, loosen the screws on the terminals so that there is enough space.
Stack the MMU power connectors on top of the the PSU cable connections in
the first two clamps on the left side of the Einsy board.
The power cable connector "fork" has bent ends. Make sure they point up. See
the picture for a reference.
Red (+ / positive) wire goes into the first slot.
Black (- / negative) wire goes into the second slot.
¡Aprieta los cables de alimentación firmemente!
Confirm that the cables are connected in the correct order to avoid causing
damage to the device.
PASO 10 Closing the electronics box
Close the door. Make sure no wire is being pinched while you close the door.
Tighten up the M3x40 screw from the other side to lock the door.
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10B. Configuración y Calibración MK3S+
Ensamblaje Original Prusa MMU3