Product pictures Product Overview: Emerson UNI2403 Parameter Specification Brand Emerson Part No. UNI2403 Series Unidrive M Type AC Variable Frequency Drive (VFD) Application & Fault Scenarios System: Emerson UNI2403 Unidrive M AC drive used in conveyors, pumps, fans, compressors, packaging machines, and general automation for motor speed control. Typical Faults: IGBT module failure → OC/OH trip, drive won't restart DC bus capacitor aging → undervoltage trips Control board