Cause : INVERSE TIME comes when prolonged overload condition, exceeding the Inverse Time allowance, has caused the trip.

IT INVERSE TIME fault in Parker AC890 drive indicates an overcurrent condition that has persisted for a duration determined by an inverse time characteristic curve. This is a protective function designed to prevent damage to the motor and the drive from prolonged overloads

Troubleshooting Steps:

Follow below steps to correct IT INVERSE TIME fault in Parker AC890 drive:

• Check the Application: Analyze the mechanical load on the motor. Is it exceeding the motor's rated capacity?
• Reduce the Load: If the motor is consistently overloaded, you may need to reduce the mechanical load, optimize the process, or consider using a larger motor.
• Verify Motor Data: Double-check that the motor parameters entered into the AC890 drive (e.g., rated current, voltage, frequency) exactly match the motor nameplate. Incorrect parameters can lead to the drive misinterpreting the current draw.
• Reduce Ramp Rates: If the acceleration or deceleration times are too short, the motor will draw high currents to change speed quickly. Increase the acceleration and deceleration ramp times in the drive parameters.