We had this Altivar 28 on our plant which was running a motor rated at 4KW / 9A. It stopped with no fault indication. When the inverter was restarted it again stopped after 30 to 45 seconds. Multiple attempts were made to start the inverter by giving start command from the control panel but every time the inverter stopped after 30 to 45 seconds. To rule out the possibility of any overload condition, motor was decoupled but the result was the same. Then to rule out any problem in the motor, motor was disconnected from inverter but the result was no different, thereby so I am assuming the problem is with the inverter. We've replaced it but still want to know was the actual fault. Any clues in this regards? Thanks
