The ABB DGV700 DGV1MRCC005AAP is an AC brushless servo drive used for high‑precision motion control in industrial applications. Common failure modes for this class of drives include over‑temperature shutdowns due to cooling fan or heat sink issues, power supply voltage spikes damaging the converter board, and loss of field bus communication causing error codes such as “Fbus” or “Comm.” Initial checks should verify that the drive’s main power connections (X1) are within spec, inspect the cooling system for dust or fan failure, and confirm that all field bus (X2‑X3) and motor signal (X4) terminals are secure. A quick review of the drive’s error log via the RS232 interface can pinpoint whether the fault is electrical, mechanical, or communication related.[oss-gpt-20b]