Control Techniques SA1100SNP is a 3‑phase AC spindle drive rated at 25.8 A (≈11 kW) for 380/460 V operation at 50/60 Hz, commonly used to power CNC spindles and high‑speed motors. Typical failure modes in this class include over‑current tripping from winding faults or motor overload, encoder/position sensor loss leading to stall or “no signal” errors, and thermal shutdowns caused by inadequate cooling or overheating of the power MOSFET array. Initial diagnostics should verify that the supply voltage is within spec, check the drive’s status LEDs and error code display for fault indications, inspect the motor windings and encoder cabling for shorts or open circuits, and confirm that the heat sink and fan are operating correctly.[oss-gpt-20b]