SIEMENS
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Siemens D 11 · 2015
4
SINAMICS G150
Drive converter cabinet units
75 kW to 2700 kW
■
Characteristic curves
Derating data
SINAMICS G150 converter cabinet units and the associated
system components are rated for an ambient temperature of
40° C and installation altitudes up to 2000 m above sea level.
At ambient temperatures > 40° C, the output current must be re-
duced. Ambient temperatures above 50° C are not permissible.
At installation altitudes > 2000 m above sea level, it must be
taken into account that the air pressure, and therefore air density,
decreases as the height increases. As a consequence, the cool-
ing efficiency and the insulation capacity of the air also de-
crease.
Due to the reduced cooling efficiency, it is necessary, on the one
hand, to reduce the ambient temperature and on the other hand,
to lower heat loss in the converter cabinet unit by reducing the
output current, whereby ambient temperatures lower than 40° C
may be offset to compensate.
The following table lists the permissible output currents depend-
ing on the installation altitude and ambient temperature for the
various degrees of protection. The specified values already in-
clude a permitted compensation in respect of installation altitude
and ambient temperatures < 40° C (temperature at the air intake
of the converter cabinet unit).
The values apply under the precondition that it is guaranteed
that the cooling air, as specified in the technical data, flows
through the units as a result of the cabinet arrangement.
As additional measure for installation altitudes from 2000 m up
to 5000 m, an isolating transformer is required in order to reduce
transient overvoltages according to EN 60664-1.
For further information, please refer to the SINAMICS Low
Voltage Engineering Manual.
Current-derating factors for converter cabinet units depending on the ambient / air intake temperature, the installation altitude and
the degree of protection
Degree of
protection
Installation altitude
above sea level
Current derating factor
(as a percentage of the rated current)
for an ambient / air intake temperature of
m
20 °C
25 °C
30 °C
35 °C
40 °C
45 °C
50 °C
IP20, IP21,
IP23 and IP43
0 ... 2000
93.3 %
86.7 %
2001 ... 2500
96.3 %
2501 ... 3000
100 %
98.7 %
3001 ... 3500
3501 ... 4000
96.3 %
4001 ... 4500
97.5 %
4501 ... 5000
98.2 %
IP54
0 ... 2000
93.3 %
86.7 %
80 %
2001 ... 2500
100 %
96.3 %
89.8 %
2501 ... 3000
98.7 %
92.5 %
3001 ... 3500
94.7 %
3501 ... 4000
96.3 %
90.7 %
4001 ... 4500
97.5 %
92.1 %
4501 ... 5000
93 %
© Siemens AG 2015