Switching Frequency And Temperature; Table 29: Switching Frequency And Temperature - KEB COMBIVERT S6 Series Instructions For Use Manual

GeNerAL DATA

3.6.2 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, in order to prevent that the drive controller
switches off due to overheating of the heat sink. If the heat sink temperature falls below
, the switching frequency is increased to the setpoint again. At temperature T
T
ur
switching frequency is immediately reduced to rated switching frequency. "Derating"
must be activated, for this function to work.
Voltage class
Device size
Mains phases
Rated switching frequency
Max. 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 29: Switching frequency and temperature
The output frequency is to be limited in such a way that it does not exceed 1/10 of the switching frequency.
1)
On reaching the temperature T
2)
creased again on cooling down to temperature T
If derating is not requested in individual cases, the function can be deactivated via software.
46
/ kHz
f
1)
SN
f / kHz
1)
S_max
/ °C
T
HS
T / °C
2)
dr
T / °C
2)
ur
T / °C
2)
em
the switching frequency is step down. The switching frequency is in-
dr
.
ur
) the switching frequency
dr
400 V
07 09 10
3
8
16
90
80
70
85
the
em
230 V
07 09
1
8
16
80
70
60
75