1. Important Safety Information
Read the ENTIRE instruction manual to become familiar with the features of the product before operating. Failure to operate the product correctly can result in damage to the product, personal property, and cause serious injury. This is a sophisticated hobby product. It must be operated with caution and common sense and requires some basic mechanical ability. Failure to operate this product in a safe and responsible manner could result in injury or damage to the product or other property. This product is not intended for use by children. Do not use with incompatible components or alter this product in any way outside of the instructions provided by Horizon Hobby, LLC. This manual contains instructions for safety, operation, and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in order to operate correctly and avoid damage or serious injury.
2. Product Overview
The ARRMA BLX185 150A waterproof Electronic Speed Controller (ESC) is designed to provide consistent power control for your RC vehicle. It is compatible with 6S LiPo battery setups and comes equipped with reliable IC5 connectors. An integrated cooling fan helps manage heat during operation, ensuring optimal performance and longevity. The ESC also features over-voltage protection and a two-stage LiPo cut-off for enhanced battery management. High-quality 10AWG wires and a 6V BEC unit are included, offering a robust power solution. The throttle profile supports Forward, Reverse, and Brake modes for versatile control.

A detailed view of the ARRMA BLX185 Brushless 6S ESC, showcasing its compact design, integrated cooling fan, and IC5 connectors.
3. Setup and Installation
Follow these steps for proper installation and initial setup of your BLX185 ESC:
- Mounting the ESC: Securely mount the BLX185 ESC in your vehicle using appropriate fasteners or double-sided tape. Ensure adequate airflow around the unit for effective cooling.
- Motor Connection: Connect the motor wires to the ESC. Ensure correct phase connection (A to A, B to B, C to C) for proper motor rotation. Refer to your motor's manual for specific wiring instructions.
- Receiver Connection: Plug the ESC's receiver lead into the throttle channel (typically channel 2) of your RC receiver.
- Battery Connection: The BLX185 ESC is fitted with IC5 connectors. Connect your compatible LiPo battery pack(s) to the ESC. Ensure the battery is fully charged before first use.
- Battery Specifications: The ESC is compatible with 3S, 4S, and 6S LiPo battery configurations. A minimum battery specification of 5000mAh and 35C discharge rate per battery pack is recommended for optimal performance.
- Radio Calibration: Perform a radio calibration procedure as outlined in your radio system's manual to ensure the ESC correctly recognizes the throttle range.
4. Operating Instructions
The BLX185 ESC offers a robust and controlled driving experience:
- Power On/Off: Use the integrated power switch to turn the ESC on or off.
- Throttle Profile: The ESC features a three-mode throttle profile: Forward, Reverse, and Brake. This allows for precise control during acceleration, deceleration, and reversing maneuvers.
- Cooling System: The built-in cooling fan actively reduces heat during intense driving, helping to maintain optimal operating temperatures and prevent thermal shutdown.
- Battery Protection: The ESC includes over-voltage protection to safeguard against excessive voltage input and a two-stage LiPo cut-off system to prevent over-discharge of your LiPo batteries, extending their lifespan.
- BEC Output: The integrated 6V BEC (Battery Eliminator Circuit) provides stable power to your receiver and servos.
5. Maintenance
Regular maintenance ensures the longevity and reliable performance of your BLX185 ESC:
- Cleaning: After each use, especially in dusty or wet conditions, gently clean the ESC and its cooling fan with a soft brush or compressed air to remove dirt and debris. Ensure no foreign objects obstruct the fan blades.
- Connection Checks: Periodically inspect all electrical connections (motor, battery, receiver) for secure fitment and signs of wear or corrosion. Loose connections can lead to intermittent power or damage.
- Wire Inspection: Check the 10AWG power wires and other cables for any cuts, fraying, or damage to the insulation. Replace damaged wires immediately.
- Storage: When not in use, store the ESC in a clean, dry environment away from extreme temperatures and direct sunlight.
6. Troubleshooting
If you encounter issues with your BLX185 ESC, consider the following:
- No Power: Ensure the battery is fully charged and properly connected. Check the power switch and all wiring for secure connections.
- Motor Not Responding: Verify that the ESC is correctly calibrated with your radio system. Check motor wire connections and ensure the motor itself is functioning correctly.
- Intermittent Operation: Inspect all connections for looseness or corrosion. Check for any physical damage to the ESC or its components.
- Overheating: Ensure the cooling fan is operating freely and not obstructed. Verify that the ESC is mounted in a location with adequate airflow. Reduce continuous high-load operation if overheating persists.
- LiPo Cut-off Activating Prematurely: Ensure your LiPo batteries are healthy and fully charged. Check the battery's C-rating and capacity to ensure it meets the recommended specifications.
For further assistance, refer to the official ARRMA support resources.
7. Specifications
| Feature | Specification |
|---|---|
| Product Dimensions | 5.5 x 3.4 x 2.2 inches |
| Item Weight | 4.6 ounces |
| Model Number | ARA390211IC |
| Manufacturer Recommended Age | 14 years and up |
| Battery Compatibility | 3S, 4S, and 6S LiPo (5000mAh - 35C minimum per pack) |
| Connectors | IC5 |
| BEC Output | 6V |
| Throttle Profile | Forward/Reverse/Brake |
8. Warranty and Support
For information regarding warranty coverage, technical support, or to access additional resources, please visit the official ARRMA website or contact their customer service department. Always refer to the manufacturer's official channels for the most up-to-date support information.
You can visit the ARRMA store for more products and information: ARRMA Official Store
