Motor overtemperature (C0121)

What does OH7 mean?

The motor temperature, detected via resolver or incremental encoder, has exceeded the threshold set in C0121. This indicates thermal overload from impermissible continuous current, frequent/prolonged acceleration processes, or the C0121 value being set too low.

• Motor temperature sensor reading (C0121) indicates overtemperature, requiring immediate shutdown.
• Motor is operating beyond its rated capacity, causing excessive heat buildup.
• Faulty motor temperature sensor reporting an incorrect high value.
• Inadequate motor cooling or ventilation.

Click steps to track your progress.

1. 1

   Check drive dimensioning to prevent continuous motor overload.

2. 2

   Correct wiring if no PTC/temperature contact is connected for reliable temperature sensing.

3. 3

   Enter a higher value in C0121 if the temperature threshold is set too low.

4. 4

   Switch off monitoring by setting C0584 = 3.