Switching Frequency And Temperature; Table 17: Switching Frequency And Temperature Of The 400 V Units - KEB COMBIVERT F6 Instructions For Use Manual

UNIT DATA OF THe 400V UNITS

3.2.4 Switching frequency and temperature

Inverter size
Rated switching frequency
Max. switching frequency
Min. switching frequency
Max. heat sink temperature
Temperature for derating the switching frequency
Temperature for uprating the switching frequency
Temperature for switching to rated switching
frequency
Table 17: Switching frequency and temperature of the 400 V units
The output frequency should be limited in such a way that it does not exceed 1/10 of the switching
1)
frequency.
The drive converter cooling is designed by way that the heat sink overtemperature
threshold is not exceeded at rated conditions. A switching frequency higher than the rat-
ed switching frequency also produces higher losses and thus a higher heat sink heating.
If the heat sink temperature reaches a critical threshold (T
can be reduced automatically step by step, in order to prevent that the drive converter
switches off due to overheating of the heat sink. If the heat sink temperature falls be-
low T
the switching frequency is immediately reduced to rated switching frequency. „Derating"
must be activated, for this function to work.
34
1)
1)
1)
, the switching frequency is increased back to the setpoint. At temperature T
UR
19
f / kHz 4
SN
f / kHz
S_max
f / kHz
S_min
/ °C 90
T
HS
T / °C
DR
T / °C
UR
T / °C
EM
20 21 22
2
16
2
95
80
70
85
) the switching frequency
DR
EM