KFU 2-/4-
30
3.12 Operation
diagrams
The technical data of the frequency inverters refer to the nominal point which was
selected to enable a wide range of applications. A functionally and efficient dimension-
ing (derating) of the frequency inverters is possible based on the following diagrams.
Installation height
100
85
60
40
20
55
45
3000
1000
2000
4000
3000
1000
2000
4000
Power reduction (Derating),
5%/1000 m above sea level,
h = 4000 m
max
max. coolant temperature,
3.3 °C/1000 m above sea level,
Mounting altitude in m above sea level
Mounting altitude in m above sea level
O
ut
put
cu
rr
ent
in
%
Cool
ant t
em
p
er
atur
e
in
°
C
Coolant temperature
100
80
63
40
20
0
10
20
30
40
50
55
Power reduction (Derating)
2.5%/K upper 40 °C, T = 55 °C
max
O
utp
ut c
ur
rent
in
%
Coolant temperature in °C
Mains voltage
100
83
63
40
20
0
400 420 440 460
480
O
utpu
t c
ur
rent i
n %
Mains voltage equal output voltage in V
Reduction of output current at constant output power (Derating)
0.22%/ V upper 400 V, U = 480 V
max
