Wiring the Unit - LPi

information on recommended wiring configuration of the micro drive units it is an overview of the micro drive lpi, including port numbering, pinouts and purpose microdrive lpi pinout the pinout for micro drive lpi units can be found below port number description 1 usb port 2 main bus positive (+) 3 serial and telemetry connector (5 pin) 4 main bus negative ( ) 5 multi colour status led 6 motor phase cables (a,b,c) 7 motor sensor connector (6 pin) 8, 9 can bus connectors, twinned for pass through (4 pin) serial and telemetry connector the pinout for the 5 pin signal and telemetry port motor sensor connector the pinout for the 6 pin motor sensor connector can bus connector the pinout for the 4 pin can bus connector port and pin tolerances the electrical limits of each port and pin on the micro drive units can be found below due to isolated interfaces, ground reference points will vary port/pin max current (ma) abs max voltage (v) abs min voltage (v) passive loading main bus 58 8 15 motor phases v bus + 0 6 0 6 can h, can l 115, differential mode can gnd + 12 can gnd 12 configurable termination when powered can gnd bus gnd + 0 2 bus gnd 0 2 uart rx 10 sig gnd + 3 4 sig gnd 0 3 pulled to 3 3 v via a 5 1k resistor uart tx 10 sig gnd + 3 4 sig gnd 0 3 open drain, pulled to 3 3 v via 5 1k resistor telemetry out 10 sig gnd + 3 4 sig gnd 0 3 pulled to 3 3 v via a 5 1k resistor bidirectional dshot response driven with an output impedance of 120 ohms signal in 10 sig gnd + 3 4 sig gnd 0 3 vcc in 30 sig gnd + 18 sig gnd + 3 3 pulled to 3 3 v via 2 7k resistor hall a b c 1 bus gnd + 3 3 bus gnd 0 2 ntc in 0 33 bus gnd + 3 3 bus gnd 5v out hall 20 5 25 4 75 wiring diagram the micro drive units can be used in two primary configurations can mode or serial mode (dshot and pwm) the wiring between the two systems differs and is covered below microdrive can wiring there are two primary methods of wiring can nodes, either as a bus (imaged below) or as a star network (stubs) if stubs are used, keeping the stub length below 1m is important (the dronecan specification recommends a maximum of 0 3m) microdrive serial wiring the 5v and signal ground connections should be star connected to a pdb when operating within a serial configuration ` 5v connection the 5v connection is not required for can on micro drive lpi , as the can is non isolated however, it is internally connected to the 5v input and can be used for power passthrough on the lpi units the 5v input line is used to power the onboard isolation circuitry, which isolates the serial protocol inputs and telemetry lines (pwm or dshot signalling) this provides an isolated signal input from the power ground for increased noise immunity and isolated telemetry output the 5v is commonly wired between each esc the recommended supply is the pdb500 5v output when using the 5v line, it should be treated as a critical signal line loss of 5v will result in loss of serial input signal ground connections should be star connected at pdb wherever possible capacitance sufficient input capacitance is vital in ensuring any motor controller's safe and efficient operation it is crucial to physically verify the availability of adequate capacitance for a specific application i t is recommended to maintain a maximum input lead length of 3 metres (9 ft) before considering the need for additional capacitance it is essential to monitor input ripple at this length closely to do this, install the motor controller in its intended use application and apply the maximum load the unit will see in service measure the voltage ripple at the input terminals to the motor controller the ripple must be less than 5% of the bus voltage the micro drive lpi also measures and logs input ripple motor selection a motor controller is only one part of a larger propulsion system selecting a system with an appropriate motor for the load is important to achieve peak performance the kv of the motor should result in the motor reaching maximum operational speed at bus voltage more details about this can be found in this blog post this ensures the peak load on the controller occurs at 100% motor duty cycle, where the controller is the most efficient we offer powertrain selection services https //www hargravetechnologies com/company/about hargrave technologies