Ambient Temperatures > 40°C And Installation Altitudes > 2000 M - Siemens SINAMICS G130 Engineering Manual

Under certain boundary conditions (line voltage at low end of permissible wide-voltage range, low ambient
temperature, restricted speed range), it is possible to partially or completely dispense with current derating at pulse
frequencies which are up to twice as high as the factory setting. Further details can be found in section "Operation of
converters at increased pulse frequency".
Pulse frequency Maximum attainable output frequency (rounded numerical values)
1.25 kHz
2.00 kHz
2.50 kHz
≥ 4.00 kHz
Maximum attainable output frequency as a function of pulse frequency
in operation with factory-set current controller clock cycles
6.3.2 Ambient temperatures > 40°C and installation altitudes > 2000 m
Permissible current as a function of ambient temperature
SINAMICS S120 Chassis units and associated system components are rated for an ambient temperature of 40 C and
installation altitudes of up to 2000 m above sea level. The current of SINAMICS S120 Chassis units must be reduced
(current derating) if they are operated at ambient temperatures above 40 C. SINAMICS S120 Chassis units are not
permitted to operate at ambient temperatures in excess of 55 C. The table below specifies the permissible current as
a function of ambient temperature for air-cooled units in Chassis format. For liquid-cooled units in Chassis format,
please refer to the appropriate derating curves in catalog D 21.3.
Installation altitude
above sea level
m
0 ... 2000
Current derating factors as a function of ambient temperature (inlet air) for air-cooled SINAMICS S120 Chassis units
Installation altitudes > 2000 m to 5000 m above sea level
SINAMICS S120 Chassis units and associated system components are rated for installation altitudes of up to 2000 m
above sea level and an ambient temperature of 40 C. If the SINAMICS S120 Chassis units are operated at an
installation altitude >2000 m above sea level, it must be taken into account that air pressure and thus air density
decrease in proportion to the increase in altitude. As a result of the drop in air density the cooling effect and the
insulation strength of the air are reduced.
SINAMICS S120 Chassis units can be installed at altitudes over 2000 m up to 5000 m if the following two measures
are utilized.
1st measure: Reduction in ambient temperature and current
Due to the reduced cooling effect of the air, it is necessary, on the one hand, to reduce the ambient temperature and,
on the other, to reduce the power losses in the Chassis units by lowering the current. In the latter case, it is
permissible to offset ambient temperatures lower than 40°C by way of compensation. The table below specifies the
permissible currents as a function of installation altitude and ambient temperature for air-cooled units in Chassis
format. The stated values allow for the permissible compensation between installation altitude and ambient
temperatures lower than 40 C (air temperature at the air inlet of the Chassis unit). The values are valid on condition
that the cabinet is designed and installed in such a way as to guarantee the required cooling air flow stipulated in the
technical data. For further information, please refer to section "Cabinet design and air conditioning" in chapter
"General Engineering Information for SINAMICS". For liquid-cooled units in Chassis format, please refer to the
appropriate derating curves in catalog D 21.3.
Installation altitude
above sea level
m
0 ... 2000
2001 ... 2500
2501 ... 3000
3001 ... 3500
3501 ... 4000
4001 ... 4500
4501 ... 5000
Current derating factors as a function of installation altitude and ambient temperature for air-cooled SINAMICS S120 Chassis
100 Hz
160 Hz
200 Hz
300 Hz
Current derating factor
at an ambient temperature (inlet air) of
20 °C 25 °C 30 °C
100 %
Current derating factor
at an ambient temperature (inlet air) of
20 °C 25 °C 30 °C
100 %
96.3 %
97.5 %
98.2 %
Engineering Information
35 °C 40 °C
35 °C 40 °C
96.3 %
98.7 %
SINAMICS Engineering Manual – November 2015
SINAMICS S120
45 °C 50 °C 55 °C
93.3 % 86.7 % 80.0 %
45 °C 50 °C 55 °C
93.3 % 86.7 % 80.0 %
inadmissible range
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