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Bus Servo Wiring and Power Solutions

Based on real customer usage scenarios, servo deployment can be divided into the following three application ranges:

Standard Applications (1-6 units)

  • Suitable for standard single-system applications using 1-6 servo units under light-load conditions.
  • When the adapter board load capacity, cable voltage drop, and connector losses are within acceptable limits, daisy-chain, parallel, or hybrid wiring methods can be used flexibly.
  • For heavy-load conditions, such as applications using 100 kg high-torque servo units, the number of connected units should be reduced based on the actual total working current.

Caution

The total working current through a single UC-01 adapter board must not exceed 20 A.

Daisy-Chain

Daisy-Chain

Parallel

Parallel

Complex Applications (7-14 units)

  • Suitable for single-system applications using 7-14 servo units.
  • As the number of servo units increases, special attention should be given to per-servo power demand, long-distance wiring voltage drop, and data cable current-carrying capacity.
  • A splitter board is recommended for power distribution, with an independent main power input feeding the splitter board to reduce line losses and improve power stability.
  • You can use the matching splitter board directly, or design a compatible splitter board circuit based on project requirements.
  • It is recommended that each daisy-chain branch carry no more than 6 servo units, and fewer for high-torque loads.
PH8 UART Serial bus servo Splitter Board
PH8

Large-Scale Applications (15 units and above)

  • Suitable for large-scale single-system applications using 15 or more servo units.
  • For this range, multiple splitter boards are recommended for grouped power distribution and wiring management, to avoid overloading a single path.
  • Between splitter boards, and between a splitter board and the UC-01 adapter board, only the signal line (S) and power negative line (-, GND) need to be connected.
  • Once the adapter board is connected to the main controller for communication, all servo units on the full chain can be controlled in a unified way.
  • Refer to the wiring diagrams and video below for the recommended connection method.

Wiring Diagrams

Data Cable Modification Guide

The included data cable can be modified using the method shown below for connections between splitter boards, and between a splitter board and the UC-01 adapter board.

Before Modification After Modification
线修改前 线修改后

Wiring Video Demo

Tip

  • If the video fails to load, please watch it on Bilibili.

Notes

Warning

  • The maximum allowed daisy-chain communication cable length between two adjacent servo units is 1 m. If the cable length exceeds 1 m, shielded cable must be used to reduce signal interference and attenuation.
  • Due to the inherent resistance of connectors and power cables, voltage drop will occur under high-current conditions. Actual design validation must be based on the specific application, and the measured voltage under full operating conditions should be used as the final criterion.