User Manual EM303B General Purpose Inverter 165 Trip Trip Cause Corrective Action Code Stable Undervoltage/SOFT Soft-start failure 1. Input power phase loss. 2. Wiring terminal of input power is loose. 3. Input power voltage drops too much. 4. Switch contact of input power is aging. 1. Check input power supply. 2. Tighten screws on input terminals. 3. Check air switch and contactor. SlU Input Phase Loss 1. Input power phase loss. 1. Check input power supply. 2. Check wiring of input power supply. 3. Check if wiring terminal is loose. IlP Overload/Stall Time Is too Long (The faults of OL and OL1 are displayed as OL.) 1. Acceleration/deceleration time is too short. 2.
In V/F control mode, the setting value of torque boost is too big. 3. Load is too heavy. 4. Inverter is in stall status for a long time. Prolong acceleration/deceleration time. Reduce setting value of torque boost. Replace with the inverter which is applicable to the load. Check if the motor cannot stop by other load. Ol Heat Sink Overheating 1. Ambient temperature is too high. 2. Poor ventilation. 3. Cooling fans are broken down. The service environment of inverter should meet the requirements. Improve environmental ventilation, and check if the vent of inverter is blocked. Replace air cooling fan. OH External Fault 1. External device fault terminal is on. 1. Check external device.
EXT Internal Faults 1. The system running time is up. Please contact the distributor. INP Inverter EEPROM Failure 1. Interference makes EEPROM read-write mistakes. 2. EEPROM is damaged. 1. Press STOP to reset, and RESET then retry. 2. Technical support is required. EED Keypad EEPROM Failure EEU Autotuning Cancelled 1. During autotuning, press STOP . RESET 1. Press STOP to reset. RESET STP Coast-to-stop in Autotuning 1. In the process of autotuning, the external coast-to-stop terminal FRS=ON. 1. Press STOP to reset. RESET SFE