External temperature 1

What does 4981 mean?

An external temperature sensor (sensor 1) has detected that the monitored equipment (e.g., motor winding) has exceeded its programmed temperature limit. This fault protects external components from overheating and potential damage, which could lead to critical system failure.

• Motor winding temperature exceeding the threshold set in P30.05 (Temp 1 Warning Limit) due to overload or inadequate motor cooling.
• Faulty external temperature sensor (e.g., PTC thermistor, RTD) wired to drive input, providing erroneously high resistance or signal.
• Incorrect parameter setting for P30.04 (Temp 1 Source) or P30.05 (Temp 1 Warning Limit) not matching the sensor type or application requirement.
• Wiring fault (e.g., short circuit or high resistance) in the external temperature sensor cable connected to input terminals (e.g., AI1, AI2).
• Mechanical issue in the monitored equipment (e.g., motor bearing overheating) causing a genuine high temperature.

Click steps to track your progress.

1. 1

   1. Measure the actual temperature of the monitored equipment (e.g., motor winding using a thermal camera or contact probe).

2. 2

   2. Verify the integrity of the external temperature sensor wiring to drive input terminals (e.g., terminals AI1 and AGND). Check for opens or shorts using a multimeter.

3. 3

   3. Test the external temperature sensor by measuring its resistance. Compare the measured value to the sensor's datasheet values or expected cold resistance.

4. 4

   4. Review drive parameters P30.04 (Temp 1 Source) and P30.05 (Temp 1 Warning Limit) to ensure they are correctly configured for the sensor type and application (e.g., PTC, PT100).

5. 5

   5. Reduce motor load by monitoring actual motor current (P01.06) if the motor is confirmed to be genuinely overheating.