General Electrical Data; Switching Frequency And Temperature; Table 23: Switching Frequency And Temperature Of The 400 V Devices - KEB COMBIVERT F6 Series Instructions For Use Manual

GeNerAL eLecTrIcAL DATA

3.3 General electrical data

3.3.1 Switching frequency and temperature

The drive controller 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. This prevents that the drive controller switch-
es off due to overheating of the heat sink. If the heat sink temperature falls below T
the switching frequency is increased back to the setpoint. At temperature T
ing frequency is immediately reduced to rated switching frequency. "Derating" must be
activated, for this function to work.
Device 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 23: Switching frequency and temperature of the 400 V devices
The output frequency should be limited in such a way that it does not exceed 1/10 of the switching frequen-
1)
cy.
42
21 22
/ kHz 8 4
f
1)
SN
/ kHz
f
1)
S_max
f / kHz
1)
S_min
T / °C 90
HS
T / °C 84
DR
/ °C 70
T
UR
T / °C 87
EM
), the switching frequency
DR
the switch-
EM
23 24
2 4 8 2
16
1.25
90 95 67 95
84 85 57 85
70 75 50 75
87 90 62 90
,
UR
4
87
77
67
82