The ESA‑Y3008A25‑31 is a microprocessor‑controlled servo drive that uses PWM for precise motor speed and torque regulation, incorporating overcurrent, overvoltage, and temperature protection circuits. Common failures on this model include burnt MOSFETs or IGBTs due to overheating, capacitor degradation in the power stage, and faulty driver ICs that cause erratic output or no response; these are often accompanied by diagnostic LEDs flashing or error codes such as “E01” (overcurrent) or “E02” (overtemperature). First‑check steps: verify the 48 V/100 A supply rail is within spec, inspect all power and gate driver components for visual damage or burn marks, and review the drive’s fault log via its serial interface to identify specific error codes.[oss-gpt-20b]