HSD DPL‑150 is a high‑speed AC servo drive used in CNC spindles and precision motion control systems. Common failure points include power supply over‑voltage, phase imbalance, overheating of the inverter modules, and degradation of the internal MOSFETs or gate drivers; these often manifest as error codes such as “DRV_ERR” or sudden loss of motor torque. First‑check steps: verify input voltage and polarity on the drive’s power terminals, inspect for burnt or cracked PCB traces, and review the drive’s diagnostic log for fault flags or temperature warnings. If no obvious hardware damage is found, test the output phase currents for balance and confirm that the drive’s firmware version matches the manufacturer’s recommendation.[oss-gpt-20b]