Cause : MOTOR I2T comes when the motor has experienced excessive heating due to prolonged overcurrent conditions. This fault is triggered when the motor's internal temperature exceeds a predetermined limit, protecting it from damage.

The MOTOR I2T fault in a Parker AC30 drive is related to the thermal protection of the motor. The I²T (current squared time) protection mechanism monitors the motor's current over time and calculates the thermal load on the motor. If the motor operates under conditions that cause it to heat up excessively—such as prolonged overcurrent—the I²T protection will trigger a fault to prevent damage to the motor.

Possible Causes and Solutions:

1. Prolonged Overcurrent Condition:

   • Cause: The motor might be drawing more current than its rated capacity for an extended period, leading to excessive heating.
   • Solution:
     • Check the load: Ensure that the motor is not overloaded. If the load is too high, reduce it to within the motor's rated capacity.
     • Adjust the drive settings: If the application requires high currents, consider adjusting the drive's current limit or motor overload protection settings, but ensure they remain within safe limits for the motor.

2. Inadequate Cooling:

   • Cause: Poor cooling or high ambient temperatures can cause the motor to overheat more quickly, triggering the I²T fault.
   • Solution:
     • Improve ventilation: Ensure that the motor and drive have adequate cooling. Check for any blockages in ventilation pathways and ensure cooling fans are working properly.
     • Inspect the environment: Make sure the motor is operating within its specified temperature range.

3. Incorrect Motor Parameters:

   • Cause: Incorrect motor settings in the drive, such as the motor's rated current or thermal time constant, can lead to improper I²T calculations and premature faults.
   • Solution:
     • Verify motor settings: Ensure that all motor parameters (e.g., rated current, thermal time constant) are correctly set in the drive according to the motor's nameplate data.

4. High Inertia Loads:

   • Cause: High inertia loads can cause the motor to draw higher currents for longer periods, especially during startup or deceleration, leading to overheating.
   • Solution:
     • Adjust acceleration/deceleration times: Increase the ramp times to reduce the current draw during these phases and help prevent overheating.
     • Consider using a larger motor: If high inertia is inherent to the application, a motor with a higher power rating may be required.

5. Mechanical Issues:

   • Cause: Mechanical problems such as binding, excessive friction, or misalignment in the load can cause the motor to work harder and overheat.
   • Solution:
     • Inspect the mechanical system: Check for any obstructions, misalignments, or excessive friction that could cause the motor to overheat. Correct any issues found.

6. Voltage Supply Issues:

   • Cause: Low or fluctuating voltage supply can cause the motor to draw more current to maintain power, leading to overheating.
   • Solution:
     • Check the supply voltage: Ensure that the drive is receiving stable and adequate voltage as specified. Address any issues with the power supply.