OH

Heatsink overtemperature

Lenze · SM29_05 Service Bulletin

What does OH mean?

The heatsink temperature has exceeded +90°C. This is typically caused by ambient temperatures above +40°C or +50°C, a dirty heatsink impeding heat dissipation, or an incorrect mounting position restricting airflow.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Clean the heatsink if it is dirty with dust or debris.

  2. 4

    Change the mounting position if it is incorrect and obstructs airflow.

Source: Lenze SM29_05 Service Bulletin
Open Manual (Page 326)