The Schlebach PS511PO4‑P1‑M3‑I1 is a single‑axis positioning controller that supports up to three speed levels and can store up to 99 programs with 3000 data sets for setpoint, quantity, and auxiliary functions. Common failure modes in this class include power supply degradation (especially the DC bus), I/O channel misconfigurations or shorted contacts, and motor driver overheating or phase loss. First‑check diagnostics: verify that the controller’s input voltage is within spec and that all connectors are secure; inspect the board for burn marks, swollen capacitors, or loose components; and review any diagnostic LEDs or error codes displayed on the panel to pinpoint a specific fault.[oss-gpt-20b]