82 lines
3.4 KiB
Markdown
82 lines
3.4 KiB
Markdown
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---
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title: "Power Distribution Hub — REV-11-1850"
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tags:
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- hardware
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- power
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- electrical
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- REV
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- 2890
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- ion
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type: hardware-spec
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owner: 2890
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status: active
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sources:
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- "https://www.revrobotics.com/rev-11-1850/"
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- "https://docs.revrobotics.com/ion-control/pdh/overview"
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---
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# Power Distribution Hub — REV-11-1850
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## Overview
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The **Power Distribution Hub (PDH)** is Team 2890's central power distribution board. It takes battery power and routes it to all robot systems — motors, controllers, sensors, and accessories. Every wire from the battery goes through the PDH first.
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## Key Features
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- **20 high-current channels** (40A max each) — for motors and motor controllers
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- **3 low-current channels** (15A continuous, 20A peak) — for pneumatics, sensors
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- **1 switchable low-current channel** — on/off control for LEDs, accessories
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- **Toolless WAGO terminals** — color-coded, latching (no screws)
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- **CAN connectivity** — telemetry feedback to robot controller
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- **USB-C** — hardware client diagnostics and firmware updates
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- **LED voltage display** — real-time battery voltage reading
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- **ESD protection**
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- **Reverse polarity protection** — protects the PDH itself (not downstream devices)
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## Channel Allocation
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| Channel Type | Count | Max Current | Typical Use |
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|--------------|-------|-------------|-------------|
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| High-current | 20 | 40A | SPARK Flex, motors, mechanisms |
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| Low-current | 3 | 15A/20A peak | Pneumatics, sensors |
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| Switchable | 1 | 15A | LEDs, indicators |
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## Electrical Specifications
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| Parameter | Value |
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|-----------|-------|
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| Operating voltage | 4.7–18V |
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| Power input gauge | 18–6 AWG (solid), 18–4 AWG (stranded) |
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| Wire strip length | 0.72–0.79 in |
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| CAN termination | 120Ω (configurable) |
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| CAN wire gauge | 26–14 AWG |
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## Wiring Notes
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- **Reverse polarity protection** on the PDH — but it does NOT protect downstream devices. Double-check polarity before wiring.
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- Use ferrules with square or hex crimps for reliable connections
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- CAN bus requires 120Ω termination on last device
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## Connection to Training
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**For students:** The PDH is the heart of the robot's electrical system. Key concepts:
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- **fusing** — each channel protected by ATO/ATM fuse or breaker. Without a fuse, a stalled motor can melt wiring.
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- **voltage drop** — long wire runs lose voltage. PDH gives real-time reading so you can catch battery sag before it kills a motor.
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- **current division** — total current = sum of all channel currents. 20 motors × 40A = you need thick battery cables.
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- **CAN telemetry** — PDH reports voltage, current per channel back to the roboRIO. This is how you see "low battery" warnings on the driver station.
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**Related training modules:**
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- [[neo-vortex-motor]] — motor that draws from PDH channels
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- [[spark-flex]] — controller that connects to PDH high-current channels
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- [[ion-build-system]] — integrates with REV ION electrical system
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- [[frc-electrical-basics]] — wire gauge, fusing, common faults
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## Source Links
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- Product: https://www.revrobotics.com/rev-11-1850/
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- Docs: https://docs.revrobotics.com/ion-control/pdh/overview
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- Specs: https://docs.revrobotics.com/ion-control/pdh/specs
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## Notes
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The PDH replaced the old "breaker panel + PDP" approach. Teams used to run separate wires from a central breaker to each load. The PDH centralizes it with CAN monitoring — you can see exactly how much current each mechanism is drawing in real time. Useful for debugging why the climber feels sluggish.
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