Drive Amplifier SD4S
5.6.3
Current Derating Due to Site Altitude and
Temperature
The following table indicates the rated current in percent depending on the site altitude
and the ambient temperature:
Site altitude above MSL
Temperature
≤1000 m
≤2000 m
≤40 °C
100 %
85 %
≤50 °C
85 %
70 %
≤60 °C
70 %
55 %
Linear interpolation is allowed.
Tab. 3: Current Derating Due to Site Altitude and Temperature
5.6.4
Current Derating Due to Low Speed
During phases of a static rotating field or low rotating field frequencies (f ≤ 5 Hz) the pow-
er semiconductors of the output stage are subject to higher loads.
For devices of the generation SD4 the current will be limited at rotating field frequen-
cies < ƒ
derating
as shown in the following figure.
f
[Hz]
I
rated
I
peak
I
[A]
I
rated (0 Hz)
I
peak (0 Hz)
f
derating
Fig. 5: Current derating at low output frequencies
5.6.5
S6 Duty Type
I-S 1 = 100 %
I-S6 = 125 %
I-S6_ NoLoad
= 40 %
72 s
48 s
120 s
Ip
[%]
t
[s]
Fig. 6: Continuous-operation periodic duty (S6)
24
Drive System SD4S - Hardware Description
