Lenze L-force HighLine C 8400 Series Reference Manual page 244

8400 HighLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions

Tip!
The Lenze setting
standard applications.
Lowering the switching frequency due to high heatsink temperatures
Exceeding the maximally permissible heatsink temperature would lead to an inhibited
drive due to the "Overtemperature" error and a torquelessly coasting motor. Therefore, if
the Lenze setting is selected, the switching frequency is reduced to the next frequency
below when the heatsink temperature has risen to 5 °C below the maximally permissible
temperature. After the heatsink has cooled down, the controller automatically switches to
the next frequency above until the set switching frequency is reached.
Switching frequency reduction due to high heatsink temperature can be deactivated via
C00144. If the switching frequency reduction is deactivated, the "OH1: Heatsink
overtemperature" error message will be issued when the maximally permissible heatsink
temperature is reached. An "Error" response is the result and the motor is coasting.
Parameter
C00144
Lowering of the switching frequency depending on the output current
"Variable" switching frequencies can be selected for the controller in C00018, where the
controller automatically lowers the switching frequency depending on the controller
output current. The modulation mode will not be changed.

The switching thresholds are given in the rated data in the 8400 hardware
manual.
• The hardware manual has been stored in electronic form on the data carrier
supplied with the 8400 drive controller.
When a "fixed" switching frequency is selected, no switching frequency changeover takes
place. In case of fixed frequencies, the controller output current is limited to the
permissible value of the corresponding switching frequency. In case of larger load
impulses, the overcurrent interruption may be activated, to which the controller responds
with "Error".
244
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C00018 = 2 (8 kHz var./drive-opt.) is the optimal value for
Info
Switching frequency reduction (temp.)
L
Lenze setting
1: On
Firmware ≤ 11.00 - DMS 6.0 EN - 10/2011