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My-Cloner Rev A — Power Distribution

See Owner-Reported Hardware and Test Status for the confirmed V3.0 hardware, connections and remaining checks.

This page describes the power architecture used by the My-Cloner Rev A.

The printer uses:

  • 230 V AC mains input
  • 24 V DC main power
  • 5 V DC auxiliary power for the Raspberry Pi

Mains Voltage

The AC input section of the printer operates at hazardous mains voltage.

Disconnect the printer from the power outlet before working on the AC wiring.

If you are not familiar with mains wiring and protective-earth practices, seek assistance from a qualified person.

Power Architecture

The My-Cloner Rev A uses the following power path:

graph TD
    A[230 V AC] --> B[IEC C14 Inlet]
    B --> C[Integrated Switch + Fuse]
    C --> D[Mean Well LRS-350-24]

    D -->|24 V DC| E[MKS Robin Nano V3]
    D -->|24 V DC| F[LM2596]

    F -->|5 V DC| G[Raspberry Pi Zero 2 W]

    E --> H[Stepper Motors and TMC2209 Drivers]
    E --> I[Hotend Heater]
    E --> J[Heated Bed]
    E --> K[Cooling Fans]
    E --> L[Sensors and Control Electronics]

AC Input

IEC C14 Inlet

The My-Cloner Rev A uses an IEC C14 mains inlet with integrated switch and fuse.

The AC input section provides:

  • Mains connection
  • Main power switch
  • Overcurrent protection through the fuse
  • Protective-earth connection

The intended mains supply is:

230 V AC

Voltage Selection

The Mean Well LRS-350-24 supports selectable input-voltage ranges.

Before connecting the printer to mains power, verify that the power supply input selector is set correctly for the local mains voltage.

For the standard My-Cloner Rev A configuration described here, the intended input is 230 V AC.

AC Connections

The My-Cloner Rev A uses an IEC C14 inlet with an integrated switch and fuse.

At this stage, the documentation treats the AC input as a functional architecture rather than a terminal-by-terminal wiring instruction.

The exact internal routing of:

  • Live (L)
  • Neutral (N)
  • Protective Earth (PE)
  • Switch poles
  • Fuse

must match the installed IEC inlet and the current My-Cloner electrical schematic.

graph LR
    MAINS[230 V AC Mains] --> IEC[IEC C14 Inlet<br/>Switch + Fuse]
    IEC --> PSU[Mains Input<br/>Mean Well LRS-350-24]

    PE[Protective Earth] --> PSU_PE[PSU Protective-Earth Terminal]
    PE --> CHASSIS[Required Exposed Conductive Parts]

The IEC inlet provides the mains connection, switching and fuse protection for the printer.

The exact conductor routing through the integrated switch and fuse must not be inferred from this functional diagram.

Before wiring or servicing the AC input, verify the terminal identification and switching arrangement against:

  1. The installed IEC inlet.
  2. The My-Cloner QElectroTech schematic.
  3. The component manufacturer's terminal identification, where available.

Protective earth must remain a dedicated safety conductor and must be connected according to the electrical design.

Protective Earth

Protective earth is a safety connection and must not be omitted.

Do not use the DC negative conductor as a substitute for protective earth.

Functional Diagram Only

The diagram above does not define which mains conductors are switched or the exact location of the fuse within the IEC inlet assembly.

Use the validated electrical schematic for terminal-by-terminal AC wiring.

Main Power Supply

The My-Cloner Rev A uses:

Mean Well LRS-350-24

Parameter Value
Output voltage 24 V DC
Maximum output current 14.6 A
Rated output power 350.4 W
Intended AC input 230 V AC

The power supply provides the main 24 V DC rail for the printer.

24 V Distribution

The 24 V rail supplies the main printer systems.

Load Voltage
MKS Robin Nano V3 24 V DC
Stepper motors / drivers 24 V DC
Heated bed 24 V DC
Hotend heater 24 V DC
4010 hotend fan 24 V DC
5015 part-cooling fan 24 V DC
LM2596 converter 24 V DC input

The final current consumption of each branch will be validated during the Rev A bring-up process.

Raspberry Pi Power

The Raspberry Pi Zero 2 W is powered through a dedicated DC-DC converter.

The converter used by the My-Cloner Rev A is:

LM2596 step-down converter

Its function is:

24 V DC → LM2596 → 5 V DC → Raspberry Pi Zero 2 W

Adjust Before Connecting

Do not connect the Raspberry Pi until the LM2596 output voltage has been measured and adjusted correctly.

Verify the output with a multimeter before connecting the Raspberry Pi.

The target output is:

5 V DC

Raspberry Pi Ground Reference

The Raspberry Pi 5 V supply and the printer controller must share the appropriate DC ground reference for reliable communication.

The final grounding arrangement must follow the My-Cloner electrical schematic.

Controller Power

The MKS Robin Nano V3 receives power from the main 24 V DC supply.

The board distributes power internally to:

  • Stepper drivers
  • Heater outputs
  • Fan outputs
  • Logic circuits
  • Sensor interfaces

The My-Cloner Rev A does not use the MKS Robin Nano V3 as the primary 5 V power source for the Raspberry Pi.

The Raspberry Pi uses the dedicated LM2596 converter instead.

Heater Power

Hotend Heater

The hotend heater is powered from the 24 V system and controlled by the MKS Robin Nano V3.

Item Value
Heater type V6-style cartridge
Voltage 24 V DC
Controller output HE0
MCU control pin PE5
Heater power 40 W — owner-reported specification

The heater is switched by the controller board MOSFET.

Heated Bed

The heated bed is also powered from the 24 V rail.

Item Value
Bed size 235 × 235 mm
Voltage 24 V DC
Controller output H-BED
MCU control pin PA0
Heater power 220 W — owner-reported specification

High-Current Load

The heated bed is one of the highest-current loads in the printer.

Use suitable wire gauge, connectors and terminal preparation for the expected current.

Fan Power

The My-Cloner Rev A uses 24 V fans.

Fan Voltage Function
4010 Axial Fan 24 V DC Hotend heatsink cooling
5015 Blower 24 V DC Part-cooling

The My-Cloner Rev A uses 24 V cooling fans. Their controller assignments are documented in the I/O Map and Fans sections.

Do Not Use Legacy 12 V Fans

Earlier My-Cloner documentation referenced 12 V fans.

Those references are obsolete for Rev A.

The current My-Cloner Rev A uses 24 V fans.

DC Ground

All low-voltage systems must use a consistent DC ground reference.

The 24 V negative rail is shared by the controller and the LM2596 input.

The LM2596 output provides the 5 V supply and ground for the Raspberry Pi.

The final wiring arrangement must ensure that:

  • DC return paths are correctly sized
  • Ground connections are secure
  • High-current loads do not share weak connections with sensitive electronics
  • Protective earth remains separate from normal DC return wiring except where specifically required by the approved electrical design

The preferred architecture is:

graph TD
    PSU[Mean Well LRS-350-24]

    BOARD[MKS Robin Nano V3]
    LM[LM2596]
    PI[Raspberry Pi Zero 2 W]

    HE0[HE0]
    BED[H-BED]
    FAN1[FAN1]
    FAN2[FAN2]
    DRIVERS[Stepper Drivers]

    HOTEND[Hotend Heater]
    HEATEDBED[Heated Bed]
    FAN_A[4010 Hotend Fan]
    FAN_B[5015 Part-Cooling Fan]
    MOTORS[Stepper Motors]

    PSU -->|24 V DC| BOARD
    PSU -->|24 V DC| LM
    LM -->|5 V DC| PI

    BOARD --> HE0
    BOARD --> BED
    BOARD --> FAN1
    BOARD --> FAN2
    BOARD --> DRIVERS

    HE0 --> HOTEND
    BED --> HEATEDBED
    FAN1 -->|PC14| FAN_A
    FAN2 -->|PB1| FAN_B
    DRIVERS --> MOTORS

Wire and Connector Requirements

Wire size must be selected according to:

  • Maximum expected current
  • Cable length
  • Connector rating
  • Ambient temperature
  • Mechanical protection
  • Applicable electrical standards

Particular attention should be given to:

  • AC mains wiring
  • Heated bed wiring
  • PSU output wiring
  • Controller power input
  • Heater connections

Terminal Preparation

Do not place loose stranded wire directly under high-current screw terminals.

Use appropriate ferrules or other approved termination methods where required.

Fuse Protection

The My-Cloner Rev A IEC inlet includes integrated fuse protection.

The final fuse specification must be selected and documented according to:

  • Printer maximum input power
  • Intended mains voltage
  • Mean Well LRS-350-24 input characteristics
  • IEC inlet and fuse-holder ratings
  • Applicable electrical and safety requirements

The fuse type, current rating and time-current characteristic must match the validated electrical design.

Fuse Specification Pending Validation

The final fuse specification for the My-Cloner Rev A has not yet been validated for release.

Do not substitute a fuse with a different type or higher current rating without verifying the electrical design.

Power-On Validation

Before the controller, Raspberry Pi or heaters are connected, the power system should be validated in stages.

Recommended sequence:

  1. Verify the IEC inlet terminal identification against the electrical schematic.
  2. Verify the switch and fuse routing against the installed inlet.
  3. Verify protective-earth continuity.
  4. Confirm the PSU voltage-selector position for the intended mains supply.
  5. Inspect all AC terminal connections.
  6. Power the PSU without sensitive electronics connected where appropriate.
  7. Measure the 24 V output.
  8. Confirm correct polarity.
  9. Connect the LM2596.
  10. Adjust the LM2596 output to 5 V.
  11. Verify the 5 V output with a multimeter.
  12. Disconnect mains power.
  13. Connect the controller and Raspberry Pi only after the voltages are confirmed.

Power Off Before Rewiring

Always disconnect mains power before changing wiring or moving connections.

Validation Status

See Status Definitions. Design assignments and source mappings do not establish physical validation.

Item Status
IEC C14 inlet Rev A assignment
230 V AC architecture Rev A assignment
Mean Well LRS-350-24 Rev A assignment
24 V main rail Rev A assignment
LM2596 24 V → 5 V Rev A assignment
Raspberry Pi Zero 2 W supply Rev A assignment
Hotend heater power — 40 W Rev A assignment
Heated bed power — 220 W Rev A assignment
Final fuse specification Pending validation
Wire gauges Pending validation
Final grounding layout Pending validation
Physical power-on test Pending validation