Drive: I2t motor model overtemperature

What does A07012 mean?

The internal thermal I2t model, primarily for synchronous motors, has detected that the motor's calculated temperature has exceeded an alarm threshold. This indicates that the motor is operating close to its thermal limits due to sustained load or environmental conditions. If ignored, this can lead to an actual motor overtemperature fault and potential damage.

• Sustained motor operation above its nominal current for an extended duration, causing the I2t model to predict overtemperature.
• Incorrect motor data entered into drive parameters (e.g., P1-04 motor rated current, P1-10 motor thermal time constant).
• Frequent acceleration/deceleration cycles or intermittent overload, which the I2t model accumulates over time.
• Motor operating in a high-ambient temperature environment not accounted for in the I2t model's default settings.
• Mechanical issues causing increased load (e.g., binding bearings, misalignment) that intermittently push the motor's current close to thermal limits.

Click steps to track your progress.

1. 1

   Monitor the motor's actual output current (e.g., Parameter P2-01) and the I2t thermal utilization (e.g., Parameter P2-02) during operation.

2. 2

   Verify drive parameters P1-04 (Motor rated current), P1-05 (Motor rated speed), and P1-10 (Motor thermal time constant) against motor datasheet.

3. 3

   Assess the mechanical load on the motor for any binding, excessive friction, or misalignment that could increase current draw.

4. 4

   If appropriate for the motor and application, increase the I2t thermal time constant (e.g., Parameter P1-10) to better match motor inertia.

5. 5

   Review the application's duty cycle; consider reducing peak loads or increasing motor cooling if I2t consistently approaches the alarm threshold.