How to Switch Between Sensored and Sensorless Modes in Brushless Drives?
Brushless motors can be divided into two types: those with Hall sensors and those without Hall sensors.
Our brushless drives by default support motors with Hall sensors, and the Hall sensor cables must be properly connected during use; otherwise, the drive will trigger an alarm.
However, some models of brushless drives support switching to sensorless mode, making them compatible with brushless motors without Hall sensors. Below are detailed instructions on how to configure the brushless drive for sensorless mode:
For the differences between brushless motors with Hall sensors and those without Hall sensors, please refer to this article: https://help.stepperonline.com/en/article/the-difference-between-a-sensed-brushless-motor-and-a-senseless-brushless-motor-193ui6k/
Debugging Tools
To adjust the operating mode of the brushless drive, you need to modify parameters via RS485 communication. Please prepare the following tools for parameter configuration:
Brushless driver
Debugging cable: The white/red cable included with the drive, or an RJ45 cable
RS485-USB adapter: For example, our RS485-1: https://www.omc-stepperonline.com/usb-to-rs422-rs485-serial-port-converter-adapter-cable-rs485-1
RS485 serial communication software: If you don't have suitable serial software, you can use the command window in our BLD-510B debugging software. Download link: https://www.omc-stepperonline.com/index.php?route=product/product/get_file&file=3446/stepperonline_bldc_software_V2.7.zip
Changing Drive Mode
After powering on the drive and connecting to the RS485 serial communication software, you can modify the operating mode of the brushless drive. Please note that some brushless drives do not support sensorless mode, and the register parameters and corresponding RS485 commands required for modification vary by model.
Below is a detailed explanation of the sensorless mode support status for all currently available brushless drives, as well as the RS485 commands needed to switch modes, for your reference:
Adjusting Startup Speed and Torque
After modifying the control mode of the brushless drive, it is necessary to set the motor's startup speed and torque according to the actual operating conditions of the brushless motor to ensure smooth operation. For the register addresses corresponding to each drive model, please refer to the communication register address table in the drive's manual.
For example, to set the startup torque of the BLD-510B to 20 (0x14 in hexadecimal) and the sensorless startup speed to 10 (0x0A in hexadecimal), where the corresponding register address is $8002H, the command to send is:
01 06 80 02 14 0A 8E CD
If you still have questions about the above, please contact our technical team.
Our brushless drives by default support motors with Hall sensors, and the Hall sensor cables must be properly connected during use; otherwise, the drive will trigger an alarm.
However, some models of brushless drives support switching to sensorless mode, making them compatible with brushless motors without Hall sensors. Below are detailed instructions on how to configure the brushless drive for sensorless mode:
For the differences between brushless motors with Hall sensors and those without Hall sensors, please refer to this article: https://help.stepperonline.com/en/article/the-difference-between-a-sensed-brushless-motor-and-a-senseless-brushless-motor-193ui6k/
Debugging Tools
To adjust the operating mode of the brushless drive, you need to modify parameters via RS485 communication. Please prepare the following tools for parameter configuration:
Brushless driver
Debugging cable: The white/red cable included with the drive, or an RJ45 cable
RS485-USB adapter: For example, our RS485-1: https://www.omc-stepperonline.com/usb-to-rs422-rs485-serial-port-converter-adapter-cable-rs485-1
RS485 serial communication software: If you don't have suitable serial software, you can use the command window in our BLD-510B debugging software. Download link: https://www.omc-stepperonline.com/index.php?route=product/product/get_file&file=3446/stepperonline_bldc_software_V2.7.zip
Changing Drive Mode
After powering on the drive and connecting to the RS485 serial communication software, you can modify the operating mode of the brushless drive. Please note that some brushless drives do not support sensorless mode, and the register parameters and corresponding RS485 commands required for modification vary by model.
Below is a detailed explanation of the sensorless mode support status for all currently available brushless drives, as well as the RS485 commands needed to switch modes, for your reference:
| Model | Support Mode | Setting Method |
|---|---|---|
| BLD-305S | Supports Hall sensor mode only | Unable to switch modes. Recommended to use BLD-405S. |
| BLD-405S | Supports both Hall sensor mode and sensorless mode | Command to send: 01 06 80 04 90 10 8C 07 |
| BLD-510B/510S | Supports both Hall sensor mode and sensorless mode | Debug software setting: Set "Type" to 16 and click "Write" or send command. 510B：01 06 80 04 AA 10 9E A7; 510S：01 06 80 04 90 10 8C 07 |
| BLD-515C | Supports both Hall sensor mode and sensorless mode | Command to send: 01 06 81 06 00 00 41 F7; Parameter save command: 01 06 81 FF FF FF 90 76 |
| BLD-530S/550S | Supports Hall sensor mode only | Unable to switch modes |
| BLD-AC400S/BLD-AC750S/BLD-AC1000S | Supports both Hall sensor mode and sensorless mode | Adjust parameter via drive panel: Set P008=00 |
Adjusting Startup Speed and Torque
After modifying the control mode of the brushless drive, it is necessary to set the motor's startup speed and torque according to the actual operating conditions of the brushless motor to ensure smooth operation. For the register addresses corresponding to each drive model, please refer to the communication register address table in the drive's manual.
For example, to set the startup torque of the BLD-510B to 20 (0x14 in hexadecimal) and the sensorless startup speed to 10 (0x0A in hexadecimal), where the corresponding register address is $8002H, the command to send is:
01 06 80 02 14 0A 8E CD
If you still have questions about the above, please contact our technical team.
Updated on: 28/03/2025
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