Cause : Motor temperature signal lost comes when the drive is unable to receive a signal from the motor temperature sensor due to wire brake or faulty sensor.

The F0015 fault in Siemens Micromaster 440 indicates a problem with the motor temperature sensor. This sensor monitors the temperature of the motor itself, which is crucial for preventing overheating.

When the Siemens Micromaster 440 reports a "Motor Temperature Signal Lost" fault, it indicates that the drive has lost communication with the temperature sensor monitoring the motor's temperature. This could be due to various reasons, such as a sensor failure, wiring issues, or a problem within the drive.

Common Causes

1. Faulty Temperature Sensor: The temperature sensor in the motor may be defective.
2. Loose or Damaged Wiring: The wires connecting the temperature sensor to the drive may be loose, damaged, or disconnected.
3. Interference or Noise: Electrical interference or noise can disrupt the signal from the temperature sensor.
4. Drive Internal Fault: An internal fault within the drive could prevent it from reading the temperature sensor correctly.
5. Parameter Settings: Incorrect parameter settings may cause the drive to lose the temperature signal.

Troubleshooting Steps

1. Inspect the Temperature Sensor:

   • Check the temperature sensor for any signs of damage or wear.
   • If possible, test the sensor with a multimeter to ensure it is functioning correctly.

2. Check Wiring Connections:

   • Inspect the wiring between the temperature sensor and the drive.
   • Ensure all connections are secure and free from damage.
   • Look for any signs of wear, fraying, or disconnection.

3. Reduce Electrical Interference:

   • Ensure that the sensor wiring is properly shielded and routed away from sources of electrical noise.
   • Check for any equipment nearby that might be generating electrical interference.

4. Verify Parameter Settings:

   • Check the parameters related to the temperature sensor to ensure they are correctly set.
   • Refer to the drive's manual to verify the correct settings for the temperature sensor.