Precautions:1. The power supply circuit on the main board has no fuse, and the built-in self-addition cause permanent damage to the chip on the board (even 2 seconds is not allowed). 2. During normal operation, there is sampling overcurrent protection at the motor output. Since the module power and current are very large, please do not short circuit when the module is not working normally. Once the short circuit has the possibility of burning , the first wiring test machine Please use small current and low voltage test, after ok, then pass high current and high voltage, because it is bare board module for sale, pay attention to the wiring line insulation, strong voltage is not allowed to the board parts. 3. Do not connect the motor that is obviously inconsistent with the voltage and current of module or is far away from the motor to avoid inexplicable damage. 1.MA MB phase line output connection motor 2. 5V GND motherboard comes with 5V power supply (current does not exceed 30MA) 3.VCC GND motor main power supply (external DC power supply) 4.SC speed pulse signal output 5 positive and negative reversing control interface (also can be connected to the external switch) 6.VR speed control signal input (onboard with potentiometer speed control can also be connected to 0-5V analog simulation PWM duty cycle to support dual signal input speed regulation) 7.Ha Hb +5V GND Hall signal Power input, generally with Hall's motor has five corresponding lines Motherboard specifications: Product Name: 450W Brushless Hall DC Motor Driver Operating voltage: 9-60V Maximum current: rated 16A 20A Maximum power: 450W Overcurrent protection: Yes Colour:Red Material:plastic Package Contents: 4 * Brushless Motor Controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.