SIEMENS
SINAMICS G180
Configuring instructions
Characteristic curves
5/5
Siemens D 18.1 · 2014
5
■
Overview
Derating data
SINAMICS G180 converters and the associated system
components are rated for an ambient temperature of 40 °C
and installation altitudes up to 1000 m above sea level.
At ambient temperatures of > 40 °C, the output current must
be reduced. SINAMICS G180 converters may not operate in
ambient temperatures in excess of 50 °C except for compact
units (up to 55 °C; option
V63
).
At installation altitudes > 1000 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
cooling efficiency and the insulation capacity of the air also
decrease.
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 compact unit by reducing the out-
put current, whereby ambient temperatures lower than 40 °C
may be offset to compensate.
The following table specifies the permissible output currents as
a function of the installation altitude and ambient temperature
(the permissible compensation between installation altitude and
ambient temperatures of < 40 °C (air intake temperature at the
entry to the compact unit) is taken into account in the specified
values).
The values apply under the precondition that a cooling air flow
through the units is ensured as stated in the technical data.
Derating for air-cooled converters
Installation altitude
above sea level
Current derating factor (as a % of the rated current) at an ambient/air intake temperature of 40 °C
m
20 °C
25 °C
30 °C
35 °C
40 °C
45 °C
50 °C
55 °C
1)
0 ... 1000
87.5 %
75.0 %
62.5 %
1001 ... 1500
100 %
94.4 %
82.6 %
70.8 %
59.0 %
1501 ... 2000
99.4 %
94.3 %
88.9 %
77.8 %
66.7 %
55.6 %
2001 ... 2500
2)
97.7 %
93.2 %
88.4 %
83.3 %
72.9 %
62.5 %
52.1 %
2501 ... 3000
2)
95.3 %
91.2 %
87.0 %
82.5 %
77.8 %
68.1 %
58.3 %
48.6 %
3001 ... 3500
2)3)
89.8 %
86.0 %
82.0 %
77.8 %
73.3 %
64.2 %
55.0 %
45.8 %
3501 ... 4000
2)3)
84.4 %
80.8 %
77.0 %
73.1 %
68.9 %
60.3 %
51.7 %
43.1 %
4001 ... 4500
2)3)
78.9 %
75.6 %
72.1 %
68.4 %
64.4 %
56.4 %
48.3 %
40.3 %
4501 ... 5000
2)3)
73.5 %
70.4 %
67.1 %
63.6 %
60.0 %
52.5 %
45.0 %
37.5 %
1)
Applies only to compact units which are not cabinet-mounted.
2)
Voltage derating (see voltage derating factor) is also required for compact
units at an installation altitude of > 2000 m.
3)
Voltage derating (see voltage derating factor) is also required for cabinet
units at an installation altitude of > 3000 m.
© Siemens AG 2014