Drive: Motor temperature sensor alarm

What does A07015 mean?

This alarm indicates an issue with the motor temperature sensor signal, such as a wire break (high resistance) or a short circuit (low resistance), preventing accurate temperature monitoring. If unresolved within the timer p0607, it will escalate to fault F07016. The drive cannot reliably monitor motor temperature, risking overheating if other protective measures are not in place.

• Open circuit in the motor temperature sensor wiring (e.g., broken wire, loose terminal connection at motor or drive terminals X2).
• Short circuit in the motor temperature sensor wiring (e.g., insulation damage, wires touching ground or each other).
• Degraded or faulty motor temperature sensor element itself (e.g., internal break, short, incorrect resistance curve).
• Incorrect sensor type selected in drive parameters (e.g., P1-20 set to PTC when a KTY sensor is installed).
• Electrical noise or interference on the sensor signal cables, especially if unshielded or routed near power cables.

Click steps to track your progress.

1. 1

   De-energize the drive and motor, then measure the resistance of the motor temperature sensor directly at the drive's input terminals (e.g., X2-2, X2-3) and compare to the sensor's datasheet.

2. 2

   Inspect the entire length of the motor temperature sensor cable for insulation damage, chafing, or signs of mechanical stress.

3. 3

   Verify the connection integrity at both the motor terminal box and the drive's sensor input terminals, ensuring screws are tightened to specification.

4. 4

   Check drive parameter P1-20 (Motor temperature sensor type) to ensure it is correctly configured for the installed sensor (e.g., PTC, KTY84, PT1000).

5. 5

   If using an RTD (e.g., PT100, PT1000), confirm proper 2-wire or 3-wire connection configuration and check for offset compensation parameters.