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Based on the detailed analysis of failure cause and form of gear box and transmission shaft in the cooling tower fan drive system, the fault monitoring system for gear box and transmission shaft is designed. By using the programmable logic controller to acquire and process the signal of the gearbox oil temperature, vibration and transmission shaft, the system can alarm and stop the gear box and transmission shaft before failure occurrence with specific programs, which effectively avoids safety incidents. Combined with cooling tower fan intelligent control system, the system can realize the cooling tower fan’s intelligent inverter and start-stop, and fault early warning and shutdown.