SIEMENS
SINAMICS S150 NEMA
Engineering Information
3
Siemens D21.7
(Part 2) – 2015
2/13
3/3
Derating data
Voltage derating:
For installation altitudes from 6,600 ft (2,000 m) up to
16,400 ft (5,000 m), voltage derating is additionally required.
Alternatively, voltage derating may be avoided by inserting an
isolating transformer upstream and in close proximity to the
drive, to reduce transient overvoltages to levels permitted by
EN 60664-1.
For additional information, please refer to the
SINAMICS Low Voltage Engineering Manual.
Current derating as a function of the installation altitude
and ambient temperature
SINAMICS S150 drives and the associated system
components are rated for an ambient temperature of 104 °F
(40 °C)
and installation altitudes up to 6,600 ft (2,000 m)
above sea level.
For ambient temperatures > 104 °F (40 °C) the output current
must be reduced. Ambient temperatures above 122 °F (50 °C)
are not permissible.
At installation altitudes > 6,600 ft ( >2,000 m) above sea
level, it must be taken into consideration that with
increasing altitude, the air pressure decreases and therefore
the air density. 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 one
hand, to reduce the ambient temperature and on the other
hand, to lower heat loss in the drive by reducing the output
current, whereby ambient temperatures lower than 104 °F
(40 °C) may be offset to compensate.
The following table specifies the permissible output current
as a function of the installation altitude and ambient
temperature for the various enclosure types.
The values apply under the precondition that it is guaranteed
that the cooling air flow is as specified in the technical data.
Installation
altitude above
sea level
m
Current derating factor
(as a % of the rated current) for an ambient/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)
For NEMA 1 and NEMA 1 filtered (IP20 to IP43) enclosures
0 to 6,600 ft
(0 to 2,000 m)
100%
100%
100%
100%
100%
93.3%
86.7%
up to 8,200 ft
(up to 2,500 m)
100%
100%
100%
100%
96.3%
up to 9,800 ft
(up to 3,000 m)
100%
100%
100%
98.7%
up to 11,500 ft
(up to 3,500 m)
100%
100%
100%
up to 13,100 ft
(up to 4,000 m)
100%
100%
96.3%
up to 14,800 ft
(up to 4,500 m)
100%
97.5%
up to 16,400 ft
(up to 5,000 m)
98.2%
For NEMA 12 ventilated (IP54) enclosures
0 to 6,600 ft
(0 to 2,000 m)
100%
100%
100%
100%
93.3%
86.7%
80.0%
up to 8,200 ft
(up to 2,500 m)
100%
100%
100%
96.3%
89.8%
up to 9,800 ft
(up to 3,000 m)
100%
100%
98.7%
92.5%
up to 11,500 ft
(up to 3,500 m)
100%
100%
94.7%
up to 13,100 ft
(up to 4,000 m)
100%
96.3%
90.7%
up to 14,800 ft
(up to 4,500 m)
97.5%
92.1%
up to 16,400 ft
(up to 5,000 m)
93.0%
Current-derating factors for SINAMICS S150 as a function of the ambient/air intake temperature, the installation altitude and the enclosure type