The M130-Distribution-HUB provides centralized power distribution, relay control, and sensor interfacing for MoTeC M130 ECU-equipped race vehicles. Designed for Formula SAE competition with the Yamaha WR450F engine.
- Direct MoTeC M130 Integration: SuperSeal 34-pin and 26-pin connectors
- 4-Layer PCB Design: Dual solid ground planes with optimized power distribution
- Relay-Switched Outputs: 4x automotive-grade SPDT relays with flyback protection
- Individual Circuit Protection: ATM fuse holders on each relay
- Phoenix Contact Terminals: Organized sensor and harness connection points
- 5V Power from MoTeC: Eliminates need for external voltage regulation
- FSAE Compliant: Master shutdown relay, individual fusing, clear labeling
| Parameter | Value |
|---|---|
| PCB Layers | 4 (Signal, GND, GND, Signal) |
| Copper Weight | 1oz (35µm) (On each layer) |
| Board Dimensions | ~120mm x 90mm |
| Max Continuous Current | 40A (Across all relays) |
| Operating Voltage | 12V nominal (8-16V range) |
| Relay Coil Voltage | 12V DC |
| Fuse Protection | ATM blade fuses (15-30A) |
| Operating Temperature | -40°C to +95°C |
| Connector Count | 2x SuperSeal, 6x Phoenix Contact |
| Reference | Component | Part Number | Value | Package | Quantity |
|---|---|---|---|---|---|
| U1, U2, U3, U4 | Automotive Relay | BARK-S-112DM | 12V SPDT | Custom | 4 |
| D1, D2, D3, D4 | Flyback Diode | 1N5399 | 1.5A/1000V | DO-15 | 4 |
| F1, F2, F3, F4 | Fuse Holder | FUSE_3568 | ATM | Custom | 4 |
| CN0 | SuperSeal Connector | 6437288-3 | 34-pin + 2-pin | Custom | 1 |
| CN1-CN5 | Terminal Block | Phoenix 1190310 | 12-pos | Custom | 6 |
Note: Fuses (15-30A ATM) not included on PCB -> user-supplied based on load requirements.
| Relay | Function | Typical Fuse Rating | Connected Load |
|---|---|---|---|
| U1 | Master Relay | 30A | Main power distribution |
| U2 | Fuel Pump Relay | 15A | Fuel pump (WR450F) |
| U3 | Lights Relay | 10A | Extra / running lights |
| U4 | Radiator Fan Relay | 15A | Engine cooling fan |
The PCB receives 12V battery & alternator power and distributes it through relay-switched outputs with individual fusing:
12V_BATT → Master Relay → 12V_OUT_MASTER_RELAY → Individual Load Relays → Fused Outputs
→ Fuel Pump
→ Lights
→ Radiator Fan
5V Power: Supplied directly from MoTeC M130 ECU 5V sensor output (no onboard regulation required). (Has dual 5V outputs at 1A Max)
- Via Stitching: Comprehensive thermal and EMI management with 4-layer stitched vias on high-current relay zones
- Dual Ground Planes: Solid inner layers for signal integrity and low-impedance return paths
- Differential Pair Routing: For CAN bus and Ethernet
- Universal Teardrops: PCB designed fir vibration resistance for motorsports environments
- EMI Shielding: Grounding via fence between high-power traces and sensitive signals
- Conformal Coating Ready: PCB accommodates post assembly coating for extra environmental protection
- Relay Orientation: Ensure pin 1 alignment with PCB silkscreen markings
- Flyback Diode Polarity: Cathode (banded end) toward relay coil positive terminal
- Fuse Selection: Size fuses per load requirements (5-30A ATM blade)
- Conformal Coating: Apply MG Chemicals 422B or equivalent after assembly
- Mounting: Use rubber grommets at mounting holes for vibration isolation
- Connect MoTeC M130 ECU via 34-pin and 26-pin SuperSeal connectors
- Wire battery 12V and alternator 12V to main power terminals
- Install appropriate ATM fuses in each holder per load requirements
- Connect sensors to Phoenix Contact terminal blocks
- Wire relay outputs to vehicle loads (fuel pump, lights, fan)
- Configure MoTeC M130 relay enable outputs (digital outputs)
Before vehicle installation:
- Continuity Check: Verify all power and ground nets
- Isolation Test: Confirm >10MΩ resistance between power and ground
- Relay Function: Enable each relays coil, verify contact closure with multimeter
- Fuse Ratings: Confirm proper fuse installation for each circuit
This project is licensed under the CERN Open Hardware Licence Version 2 - Permissive (CERN-OHL-P-2.0).
You are free to:
- Use commercially
- Modify
- Distribute
- Use in closed source, with notice of changes
See LICENSE file for full terms.
Designed by: RAM Racing @ VCU Formula SAE Team
Main Designer: Isaac Subudhi
Target Vehicle: Yamaha WR450F IC Engine
ECU Platform: MoTeC M130
Design Tool: KiCad 9.0
For technical questions or contributions, please open an issue or pull request.
Disclaimer: This design is provided as-is for educational and motorsports purposes. Users are responsible for validating the design meets their specific application requirements and safety standards.