Technical specifications
12.2 General data
Enclosed Drives
800
Operating Instructions, 12/2018, A5E36652151A
12.2.1.2
Installation altitudes over 6600 ft and up to 16500 ft above MSL
When operating SINAMICS S150 NEMA cabinet units at altitudes over 6600 ft (2000 m)
above MSL, keep in mind that as the altitude increases, the air pressure and therefore also
the density of the air decrease. The cooling effect as well as the insulating capability of the
air decrease as a result of the lower air density.
The drive units can be installed at altitudes over 6,600 ft and up to 16,500 ft (2000 m to
5000 m) if the following measures are applied.
Decreasing the ambient temperature and the output current
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 cabinet unit by
reducing the output current, whereby ambient temperatures lower than 104 °F (40 °C) may
be offset for compensation purposes and are taken into account in the tables. The following
tables indicate the permissible output currents as a function of the installation height and
ambient temperature for the different degrees of protection. The specified values already
include the permissible compensation between installation altitude and ambient tempera-
tures lower than 104 °F (40 °C) (incoming air temperature at the inlet to the enclosed drive).
Theses values are only applicable if the cabinet installation provides a flow of cooling air
through the drive units as indicated in the technical specifications.
Table 12- 4 Current derating as a function of the ambient temperature (inlet air temperature at the air inlet of the enclosed
drive) and installation altitude for enclosed drives in a NEMA 1 enclosure
Installation altitude above
mean sea level
Current derating factor
at an ambient temperature (air intake temperature) of
68 °F
(20 °C)
77 °F
(25 °C)
86 °F
(30 °C)
95 °F
(35 °C)
104 °F
(40 °C)
113 °F
(45 °C)
122 °F
(50 °C)
0 ... 6600 ft (0 ... 2000 m)
100%
100%
100%
100%
100%
93.3%
86.7%
... 8250 ft (... 2500 m)
100%
100%
100%
100%
96.3%
... 9900 ft (... 3000 m)
100%
100%
100%
98.7%
... 11550 ft (... 3500 m)
100%
100%
100%
... 13200 ft (... 4000 m)
100%
100%
96.3%
... 14850 ft (... 4500 m)
100%
97.5%
... 16500 ft (... 5000 m)
98.2%
Summary of Contents for SINAMICS S150 NEMA
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