1. Introduction
The 9imod BLS-HV70MG is a high-performance 70KG digital high-voltage brushless servo motor designed for demanding applications in 1/8 and 1/10 scale RC cars, robots, and boats. This servo features robust construction, including heat-treated metal gears and a full CNC aluminum shell, ensuring durability and precise control. With IP67 waterproof protection, it is suitable for various environments. This manual provides essential information for the proper setup, operation, and maintenance of your 9imod BLS-HV70MG servo.
Image 1.1: 9imod BLS-HV70MG Digital Servo Motor with features such as High Torque, Full Aluminum Case, High Speed, Fast Heat Dissipation, Metal Gear, HV Digital Brushless Servo, 180°/270°/360° options, and IP67 Waterproof rating.
2. Features
- Upgraded High Voltage Performance: Operates efficiently within a 10.0V to 15V range, utilizing a high-performance digital brushless motor for faster speed and reaction.
- IP67 Waterproof Rating: Provides excellent waterproof protection, allowing the servo to function reliably in various wet conditions.
- High Rotation Control: Offers selectable control angles of 180°, 270°, or 360° to suit diverse application needs.
- Durable Construction: Equipped with heat-treated stainless steel gears, a full CNC aluminum shell, and dual ball bearings for enhanced durability, reduced noise, and lighter weight.
- Heat-treated Anti-Sweeping Gear: Gears possess approximately twice the hardness of ordinary stainless steel, providing superior wear resistance and preventing tooth stripping.
Image 2.1: Visual comparison illustrating the difference between an ordinary gear and a heat-treated gear, highlighting the improved durability of the latter.
3. Specifications
| Attribute | Specification |
|---|---|
| Brand | 9imod |
| Model | BLS-HV70MG |
| Color | Black |
| Control Angle Options | 180° / 270° / 360° |
| Dead Band Width | 1 µsec |
| Gear Material | Metal Gear (Heat-treated Stainless Steel) |
| Case Material | Full CNC Aluminum Shell |
| Control System | PWM Control (1500µsec in the central point) |
| Operation Voltage Range | 10.0V ~ 15V |
| Operation Temperature Range | -20°C ~ +60°C |
| Life Cycle | ＞100 million times (without load) |
| Operation Travel | 60° ± 1 |
| Limit Angle | 180° / 270° / 360° ± 1 |
| Direction | Re-clock wise / Pulse Travel 500→2500 µsec |
| Driver Type | MOS Drive |
| Motor Type | Brushless Motor |
| Potentiometer Type | Direct Drive |
| Amplifier Type | Digital Control |
| Ball Bearing | 2BB |
| Connector Wire Length | 300mm |
| Connector Wire Gauge | 22AWG |
| Dimensions (L x W x H) | 40 x 20 x 42.5mm |
| Weight | 89g (without servo horn) |
Torque and Speed Performance:
| Voltage | Operating Speed (60°) | Stall Torque | Idle Current | Running Current |
|---|---|---|---|---|
| 10.0V | 0.13 sec | 56 kg-cm | 400mA | 5500mA |
| 12V | 0.10 sec | 65 kg-cm | 450mA | 6800mA |
| 14V | 0.09 sec | 70 kg-cm | 550mA | 8000mA |
Image 3.1: Graphical representation of the 70KG servo's operating speed and stall torque at different voltage levels.
Image 3.2: Detailed dimensional drawings (in mm) of the 9imod BLS-HV70MG servo from top, side, and front views.
4. Setup
4.1 Unpacking and Included Components
Carefully unpack your 9imod BLS-HV70MG servo. The package should include:
- 1 x 9imod BLS-HV70MG Servo Motor
- 1 x 25T Metal Servo Arm
- Servo Accessories (screws, rubber grommets, plastic servo arms)
Image 4.1: The 9imod BLS-HV70MG servo (180° version) shown with its standard accessories, including the 25T metal servo arm.
4.2 Installation
- Mount the servo securely into your RC model (car, robot, or boat) using appropriate mounting hardware. Ensure the servo is firmly attached to prevent movement during operation.
- Attach the included 25T metal servo arm to the servo output shaft. Ensure it is aligned correctly for your application.
- Connect the servo arm to your model's steering linkage or control surface using suitable rods and connectors. Verify smooth, unobstructed movement throughout the full range of motion.
4.3 Wiring Connections
The 9imod BLS-HV70MG is a high-voltage (HV) servo and requires an external power supply capable of providing 10.0V to 15V. It uses a JR JST Plug for connection. Observe the following wiring color code:
- Brown Wire: Negative (-)
- Red Wire: Positive (+)
- Black Wire: Negative (-)
- Yellow Wire: Signal (S Single)
Important: This high-voltage servo needs to be supplied with extra power. Do not connect it directly to a standard receiver's 5-6V output without an appropriate HV-compatible power source or BEC (Battery Eliminator Circuit).
Image 4.2: Illustration of the JR JST Plug type and the corresponding wire color codes for Negative, Positive, and Signal connections.
5. Operating Instructions
5.1 Control Angle Selection
The 9imod BLS-HV70MG servo is available in 180°, 270°, and 360° (continuous rotation) versions. Ensure you have selected the correct version for your application.
- 180°/270° Servos: These are standard positional servos, moving to a specific angle based on the input signal.
- 360° Servos: These are continuous rotation servos. The input signal controls the speed and direction of rotation, not a specific angle.
Image 5.1: Diagram illustrating the range of motion for 180°, 270°, and 360° servo types.
5.2 360° Servo Specifics
For the 360° continuous rotation servo, it features a built-in adjustable potentiometer. This means that the left and right of the middle locus (center position) correspond to 180 degrees of movement, not a full 360 degrees of positional rotation. The potentiometer allows for fine-tuning of the neutral point and range of continuous rotation.
5.3 Application Examples
This servo is compatible with a wide range of RC models, including 1/8 and 1/10 scale crawler trucks (e.g., Traxxas, SCX10), various RC cars, robots, and boats. Its high torque and waterproof capabilities make it suitable for demanding steering and control tasks.
Image 5.2: Examples showcasing the 9imod BLS-HV70MG servo installed in an RC crawler truck and robotic arm applications.
6. Maintenance
- Regular Inspection: Periodically check the servo for any signs of wear, especially on the gears and casing. Ensure all mounting screws are tight.
- Gear Care: While the heat-treated metal gears are highly durable, avoid excessive force or impacts that could damage them. If unusual noises or resistance are observed, inspect the gears for debris or damage.
- Waterproof Integrity: Although the servo is IP67 waterproof, prolonged submersion or exposure to corrosive liquids should be avoided. After use in wet conditions, wipe the servo clean and allow it to air dry.
- Temperature: Operate the servo within its specified temperature range of -20°C to +60°C. Extreme temperatures can affect performance and lifespan.
- Cleanliness: Keep the servo free from dirt, dust, and debris, which can interfere with its operation and potentially damage internal components.
Image 6.1: Exploded view detailing the internal structure, including waterproof gaskets, bearings, and heat-treated stainless steel gears, which are crucial for maintenance checks.
7. Troubleshooting
- Servo Not Responding:
- Check power supply: Ensure the servo is receiving the correct voltage (10.0V-15V) from an appropriate HV-compatible power source.
- Verify wiring: Confirm that the Brown, Red, Black, and Yellow wires are connected correctly as per the wiring diagram (Image 4.2).
- Check receiver/controller: Ensure your receiver or flight controller is functioning correctly and sending a valid PWM signal.
- Erratic Movement or Jittering:
- Power fluctuations: Insufficient or unstable power can cause erratic behavior. Ensure your power source can handle the servo's running current (up to 8000mA at 14V).
- Signal interference: Check for sources of electromagnetic interference near the servo or signal wire.
- Mechanical binding: Ensure there is no mechanical binding in the linkage or control surface that could impede smooth servo movement.
- Loss of Torque or Stripped Gears:
- Overloading: The servo has a maximum stall torque. Exceeding this can lead to damage.
- Impact damage: Severe impacts can damage gears. Inspect the gears for any visible damage.
- Wear and tear: While durable, gears can wear over time. Regular inspection (as per Maintenance section) is recommended.
- Water Ingress:
- Although IP67 rated, inspect the casing and seals for any cracks or damage if water is suspected to have entered.
8. User Tips
- Proper Power Supply: Always ensure your power source (battery and BEC) is capable of providing the necessary voltage and current for this high-voltage servo, especially under load. Inadequate power is a common cause of performance issues.
- Servo Arm Selection: Use the included 25T metal servo arm for optimal performance and durability. Avoid using weaker plastic arms with this high-torque servo.
- Initial Setup: When first setting up, ensure the servo is centered before attaching the servo arm and linkages to prevent undue stress on the gears.
- Environmental Considerations: While waterproof, avoid unnecessary exposure to harsh chemicals or extreme temperatures to prolong the servo's lifespan.
9. Warranty and Support
For any issues or defects encountered with your 9imod BLS-HV70MG servo motor, please contact the seller or manufacturer directly. Provide detailed information about the problem, including any relevant pictures or videos, to facilitate efficient support.