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SYSTEM AND MODULE DATA
3.2.6 Switching frequency and temperature
The drive inverter cooling is designed by way that the heat sink overtemperature thresh-
old is not exceeded at rated conditions. A switching frequency higher than the rated
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, in order to prevent that the drive inverter switches off
due to overheating of the heat sink. If the heat sink temperature falls below TUR, the
switching frequency is increased back to the setpoint. At temperature T
frequency is immediately reduced to rated switching frequency. "Derating" must be acti-
vated, for this function to work.
Module
Rated switching frequency
Minimum switching frequency
Maximum switching frequency
Maximum heat sink temperature
Temperature for derating the switching frequency
Temperature for uprating the switching frequency
Temperature for switching to rated switching frequency
Maximum internal temperature
Table 17:
Switching frequency and temperature
1) The output frequency is to be limited in such a way that it does not exceed 1/10 of the switching frequency.
3.2.7 Cooling and coolant connection
Design system
Aluminium heat sink
NOTICE
44
Material
max.
pressure
EN-AW-6060 T66
Deformation of the heat sink by pressure peaks!
Maximum test pressure 4 bar!
► Maximum test pressure may not be exceeded briefly by pressure
peaks !
► Observe Directive 2014/68/EU for pressure equipment !
) the switching frequency
DR
A
/ kHz
f
1)
SN
/ kHz
f
1)
S_min
f
/ kHz
1)
S_max
/ °C
T
HS
/ °C
T
DR
/ °C
T
UR
T
/ °C
EM
/ °C
T
IT
operating
Connection
=>
„3.3.7 Connection to the
2 bar
coolant for all housing sizes"
the switching
EM
b
C
8
8
16
75
80
65
70
45
50
70
75
95
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