1. Introduction
The MATEK Mateksys SERVO PDB (Power Distribution Board) with BEC (Battery Eliminator Circuit) is designed to provide a stable and adjustable power supply for servos in RC (Radio Control) applications. It is particularly useful for flight controllers that lack a dedicated BEC for servos, or for large-scale RC airplanes where reducing circuit loss and voltage drop on servo power wires is critical. This manual provides detailed instructions for the proper installation, operation, and maintenance of your SVPDB-8S.
2. Features
- Wide Operating Input Range: 5.5V to 36V
- Adjustable Servo Output Voltage (Vx): 5V, 6V, 7.2V, 8.2V (Default is 5V)
- High Current Capability: 4A Continuous load current, 7A Burst
- High Efficiency: Maximum Duty Cycle of 100% when input voltage is less than 8.2V
- Output Short-circuit Tolerant (up to 3 seconds)
- Compact Size and Lightweight Design
3. Specifications
| Parameter | Value |
|---|---|
| Operating Input Range | 5.5V to 36V |
| Servo Output Voltage (Vx) | 5V, 6V, 7.2V, 8.2V (Adjustable, Default 5V) |
| Continuous Load Current | 4A |
| Burst Current | 7A |
| Maximum Duty Cycle | 100% (when input voltage < 8.2V) |
| Output Protection | Short-circuit tolerant (3 seconds) |
| Input Polarity Protection | None (No protection for reversed input polarity) |
| Pins Distance | 2.54mm |
| Dimensions | 26 x 21 x 5mm |
| Weight | 4g |
4. Setup and Installation
Careful installation is crucial for the proper functioning and longevity of your SERVO PDB. Please follow these steps:
4.1 Component Identification
Figure 1: Top-down view of the Mateksys Servo PDB, highlighting the main components, input/output pins, and voltage selection pads. Note the large inductor and integrated circuits.
Figure 2: Left image shows the bottom of the Servo PDB with 'MATEKSYS Servo PDB' branding. Right image shows the top view with dimensions (26mm x 21mm) and pin labels for Vbat IN, G, Vx OUT, and individual servo signal pins (1-6).
4.2 Input Power Connection
- Connect your main battery voltage (5.5V to 36V) to the Vbat IN and G (Ground) pads on the PDB. Ensure correct polarity.
- WARNING: This board has no protection for reversed input polarity. Connecting the battery with reversed polarity will damage the board. Double-check your connections before applying power.
4.3 Servo Output Voltage Selection
The SERVO PDB allows you to select the output voltage for your servos (Vx). The default output voltage is 5V. To change the output voltage:
- Locate the small solder pads labeled Vx, 5V, 6V, 7.2V, and 8.2V on the board (refer to Figure 1).
- To select a voltage, bridge the Vx pad to the desired voltage pad (e.g., bridge Vx to 7.2V for 7.2V output). Use a small amount of solder to create a clean bridge.
- Ensure only one voltage option is bridged at a time. Bridging multiple options or leaving none bridged may result in incorrect or no output voltage.
4.4 Servo Connection
Connect your servos to the output pins. Each servo typically requires three connections: Power (Vx OUT), Ground (G), and Signal.
- The Vx OUT pins provide the selected regulated voltage to your servos.
- The G pins provide the common ground for your servos.
- The numbered pins (1-6) are for the servo signal lines, typically connected to your flight controller or receiver.
- Use Dupont 2.54mm pins (included in packing) for secure connections if needed.
5. Operating Instructions
Once properly installed and connected, the SERVO PDB operates automatically. It will regulate the input voltage down to the selected output voltage for your servos.
- Ensure all connections are secure before powering on your RC system.
- Monitor your servo performance. If servos are sluggish or unresponsive, check the voltage selection and input power.
- The board is designed to handle continuous loads of 4A and burst loads of 7A. Do not exceed these limits to prevent damage.
6. Maintenance
The SERVO PDB is a robust electronic component, but proper care can extend its lifespan:
- Keep the board clean and free from dust, dirt, and moisture.
- Regularly inspect solder joints and wire connections for any signs of wear, corrosion, or looseness.
- Avoid exposing the board to extreme temperatures or direct sunlight for prolonged periods.
- Do not attempt to modify the board beyond the specified voltage selection. Unauthorized modifications can void warranty and cause damage.
7. Troubleshooting
If you encounter issues with your SERVO PDB, consider the following troubleshooting steps:
- No Power Output:
- Check input voltage (Vbat IN) to ensure it is within the 5.5V to 36V range.
- Verify input polarity. Remember, there is no reverse polarity protection.
- Ensure the Vx output voltage selection pads are correctly bridged (only one option bridged).
- Check for any short circuits on the output side. The board is short-circuit tolerant for 3 seconds, but prolonged shorts can cause damage.
- Incorrect Output Voltage:
- Re-check the solder bridge for Vx output voltage selection. Ensure it is clean and only bridging the desired voltage.
- Servos Behaving Erratically/Weakly:
- Ensure the selected output voltage is appropriate for your servos.
- Check if the total current draw of your servos exceeds the 4A continuous or 7A burst limit.
- Inspect all servo connections for looseness or poor contact.
8. Warranty and Support
This product is manufactured by Mateksys. For warranty information, technical support, or further assistance, please refer to the official Mateksys website or contact your retailer. Keep your proof of purchase for warranty claims.
