OH8 Motor temperature via inputs T1 and T2 is too high

What does x058 mean?

The motor temperature is too high, detected by a PTC or temperature contact connected to terminals T1 and T2. This indicates motor thermal overload due to impermissible continuous current or frequent/long acceleration processes. The fault can also occur if terminals T1 and T2 are not correctly connected to a temperature sensor. This monitoring can be switched off via C0585.

• Continuous operation of the motor drawing current significantly above its rated value (C0091) for extended periods, leading to thermal overload.
• Failure or obstruction of the motor's cooling fan, or accumulation of debris on motor cooling fins, severely impeding heat dissipation.
• High ambient temperature (Tu) around the motor (e.g., >50°C), exceeding its specified operating limits and reducing cooling effectiveness.
• PTC thermistor or temperature contact connected to terminals T1 and T2 reaching its trip temperature due to actual motor overheating.
• Incorrect wiring or fault in the temperature sensor circuit connected to T1 and T2 (e.g., short circuit, open circuit, incorrect sensor type selected in C0053).

Click steps to track your progress.

1. 1

   Measure the actual motor current (e.g., with a clamp meter on one output phase) and compare to the motor's rated current (C0091) over time.

2. 2

   Visually inspect the motor's cooling fan for proper operation and clean any dust or debris from the motor cooling fins.

3. 3

   Measure the resistance of the PTC thermistor (between terminals T1 and T2) when the motor is cool and compare it to the sensor's specifications.

4. 4

   Verify parameter C0053 (Motor temperature sensor type) is correctly configured for the PTC thermistor or temperature contact connected to T1 and T2.

5. 5

   Reduce the mechanical load on the motor or adjust the process to decrease the frequency of starts/stops if they contribute to thermal overload.

6. 6

   Check ambient temperature around the motor with a thermometer to ensure it's within the motor's specified operating range.