Cause : Inverter overload trip comes when current not less than 120% of the rated output current flows and overcurrent trip does not occur (170% or less), the electronic thermal relay activates to stop the inverter output in order to protect the output transistors. (Overload capacity 120% 60s inverse-time characteristic)

1. Check that acceleration/deceleration time is not too short.
2. Check that torque boost setting is not too large (small).
3. Check that load pattern selection setting is appropriate for the load pattern of the using machine.
4. Check the motor for the use under overload.
5. Set the acceleration/deceleration time longer.
6. Adjust the torque boost setting.
7. Set the load pattern selection setting according to the load pattern of the using machine.