TDE Macno OPDE B‑022A is a brush‑less servo drive that supports Modbus, CANopen, Profibus DP and EtherCAT interfaces and uses sensor‑less control algorithms for BLDC or asynchronous motors. Known failure modes include power supply over‑voltage or ripple causing the drive to shut down, motor wiring faults (phase reversal or open phase) leading to stall or overcurrent protection trips, and firmware/parameter corruption that can trigger error codes such as “E001” (over‑temperature) or “E002” (communication loss). For initial troubleshooting verify the 48 V DC supply voltage and ripple with a multimeter, check motor phase connections for correct polarity and continuity, and review the drive’s diagnostic registers via its communication protocol to identify any active error flags.[oss-gpt-20b]