Lenze 8400 motec Manual - Manual (Page 39)

Technical data
Switching frequency reduction
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39 EDS84DG752 EN 4.0
4.3 Switching frequency reduction
Under certain operating conditions, the maximum output current is limited for all devices:
ƒ When the maximum heatsink temperature is exceeded, the controller switches
from 16 kHz to 8 kHz and from 8 kHz to 4 kHz, irrespective of the switching
frequency mode. This function can be deactivated via C00144.
If the heatsink temperature increases above 105 °C, the controller is inhibited and the
error message "OH1: Heatsink overtemperature" is output.
The error response is also triggered when the switching frequency reduction is
deactivated.