The Parker SD15 is a 5‑amp stepper motor drive designed for industrial motion control, featuring active damping and anti‑resonance circuitry to reduce vibration. Common failure modes in this class include overheating of the driver board due to overcurrent or poor ventilation, degradation of the MOSFETs or gate drivers, and loss of communication with the host controller (e.g., missing or corrupted firmware). For troubleshooting, first verify that the supply voltage is within spec and that the drive’s temperature remains below 80 °C during operation; next check all digital I/O connections for proper logic levels and inspect the board for burnt components or cracked solder joints; finally review any error codes displayed on the drive’s diagnostic panel or host‑side logs.[oss-gpt-20b]