f30003 fault in siemens drive

F30003 fault in Siemens SINAMICS drives (G120/S120) indicates a DC link undervoltage. This means the internal DC voltage drops below the set limit, often during motor startup, high acceleration, or heavy loads.

 

Causes for F30003:

• Line Supply Failure/Undervoltage: The input voltage is too low, or a phase is missing.
• Excessive Load/Acceleration: Rapid acceleration or heavy load causes a "shock load" on the DC bus.
• DC Link Connection Issues: Loose or improper cabling between the rectifier and inverter
• Component Failure: Faulty power unit, input reactor, or capacitor bank.
• Safety Circuit Cycling: Interrupting 230V/400V mains while the drive is enabled

Solution:

• Check Line Voltage: Verify the input voltage matches the drive’s rating (\(P0210\)).
• Inspect - Input Phases: Ensure all three phases are present and balanced.
• Check Mechanical Load: Reduce motor load or deceleration rates to reduce voltage drop.
• Verify DC Connections: Ensure secure connections on the DC bus.
• Check Hardware: Check for a faulty rectifier or power unit (PM) if the supply is stable.