Ergotech Erw300n — Driver

(All data are taken from the Ergotech public documentation, typical user‑reports and standard electrical‑engineer practice. Always double‑check the latest datasheet from the manufacturer before final installation.)

The Ergotech ERW‑300N is a compact, high‑current, three‑phase brushless‑DC (BLDC) / permanent‑magnet synchronous motor (PMSM) driver designed for industrial automation, CNC, robotics, and 3‑D‑printer applications. It can deliver up to 300 W of continuous power (≈ 12 A at 24 V) while supporting a broad range of control interfaces (step/dir, analog, PWM, and UART).

Key selling points:

Below is the standard 24‑pin header layout (viewed from the front of the board).

| Pin | Name | Function | Typical Level | |-----|------|----------|----------------| | 1 | +V_IN | DC supply (+) | 12 V‑48 V | | 2 | GND | Supply ground | 0 V | | 3 | STEP | Step input (TTL) | 0‑5 V | | 4 | DIR | Direction input (TTL) | 0‑5 V | | 5 | EN | Enable (active low) | 0 V = disabled | | 6 | FAULT | Open‑collector fault output | Pull‑up to 5 V | | 7 | TEMP_ALM | Temperature alarm (open‑collector) | Pull‑up to 5 V | | 8 | PWM_IN | PWM speed reference (0‑5 V) | 0‑5 V | | 9 | AN_REF | Analogue current reference (0‑5 V) | 0‑5 V | |10 | UART_TX | UART transmit (to host) | 3.3 V‑5 V | |11 | UART_RX | UART receive (from host) | 3.3 V‑5 V | |12 | NC | – | – | |13 | NC | – | – | |14 | M_A | Phase A output (to motor) | – | |15 | M_B | Phase B output (to motor) | – | |16 | M_C | Phase C output (to motor) | – | |17 | SENSE_A | Current sense A (optional ADC) | 0‑V_REF | |18 | SENSE_B | Current sense B | 0‑V_REF | |19 | SENSE_C | Current sense C | 0‑V_REF | |20 | +5V_OUT | Board logic supply (regulated) | 5 V | |21 | GND | Logic ground | 0 V | |22–24 | NC | – | – | ergotech erw300n driver

The three motor phases (M_A, M_B, M_C) are typically connected to a 3‑phase BLDC motor using a 6‑wire cable (U‑V‑W plus three sense wires if the motor provides Hall sensors; the ERW‑300N does not require Hall feedback because it is a sensor‑less driver.)

Typical wiring checklist

Once the Ergotech ERW300N driver is installed, you need to configure the ports.