The Lenze AC Tech M1430B is a 3 HP, 400–480 V three‑phase variable frequency drive from the MC1000 series, designed for constant‑power motor control with ramped start/stop and PID speed regulation. Common failure points in this class of drives include insulation breakdown on the power stage (MOSFETs or IGBTs), overheating of the internal cooling fan or heat sink, and degradation of the input filter capacitors leading to ripple and overvoltage spikes. Additionally, firmware corruption can cause loss of communication with the host controller, while mechanical issues such as a stuck motor shaft may trigger overload protection.

First‑check diagnostics: verify that the 400–480 V supply is clean and within spec; inspect the drive’s internal fan and heat sink for dust or damage; check all input/output wiring for continuity and proper polarity; review any stored error codes in the drive’s diagnostic display or via the host interface. If these checks are normal, proceed to a full power‑stage inspection and consider re‑flashing the firmware if communication errors persist.[oss-gpt-20b]