ST500 | Err.04, what does this message mean and what can you do?
If the error message Err.04 appears on the frequency inverter display, it means an overcurrent occurred at constant speed.
Causes:
- Motor voltage is set too low (b0.02), missing motor parameters for vector control (b0.00 to b0.10), sudden increase in motor load, inverter’s rated power is too low, or short circuit at the inverter output.
Solutions:
- Set the motor voltage correctly using parameter b0.02, according to the nameplate, considering star/delta.
- Set parameters b0.00 to b0.10 to enable vector control (see FAQ Motor Parameters).
- Reduce sudden load changes, use an inverter with higher output power if necessary.
- Rated power of the inverter is too low – use an inverter with higher output power.
- Check motor and wiring for short circuits.