Dimensioning Information For Air-Cooled S120 Cabinet Modules; Derating Data Of Air-Cooled S120 Cabinet Modules; Derating Data For S120 Cabinet Modules With Power Units In Chassis Format - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information

7.2.2 Dimensioning information for air-cooled S120 Cabinet Modules

7.2.2.1

Derating data of air-cooled S120 Cabinet Modules

7.2.2.1.1 Derating data for S120 Cabinet Modules with power units in Chassis format

These Cabinet Modules include Basic Line Modules, Smart Line Modules, Active Line Modules and Motor Modules
with power units in Chassis format including the relevant system components (e.g. line filters, built-in Braking
Modules and motor filters), as well as Line Connection Modules and Auxiliary Power Supply Modules.
Not included are the derating data for Cabinet Modules with power units in booksize format and the derating data for
Central Braking Modules. These data can be found in sections "Derating data of S120 Cabinet Modules with power
units in Booksize format" and "Central Braking Modules".
Permissible output current and maximum output frequency as a function of pulse frequency
This information can be found in section "Rated data, permissible output currents, maximum output frequencies" in
chapter "General Information about Built-in and Cabinet Units SINAMICS S120".
Permissible current as a function of ambient temperature
SINAMICS S120 Cabinet Modules 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 Cabinet Modules must be
reduced (current derating) if they are operated at ambient temperatures above 40 C. SINAMICS S120 Cabinet
Modules are not permitted to operate at ambient temperatures in excess of 50 C. The following tables specify the
permissible current as a function of the ambient temperature for the different degrees of protection.
Installation altitude Current derating factor
above sea level at an ambient temperature (inlet air) of
m
0 ... 2000
Current derating factors as a function of ambient temperature (inlet air) for SINAMICS S120 Cabinet Modules (Chassis)
in degrees of protection IP20, IP21, IP23 and IP43
Installation altitude Current derating factor
above sea level at an ambient temperature (inlet air temperature) of
m
0 ... 2000
Current derating factors as a function of ambient temperature (inlet air) for SINAMICS S120 Cabinet Modules (Chassis)
in degree of protection IP54
Installation altitudes > 2000 m to 5000 m above sea level
SINAMICS S120 Cabinet Modules 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 SINAMICS S120 Cabinet Modules are operated at
installation altitudes greater than 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 Cabinet Modules 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 Cabinet Modules by lowering the current. In the latter case, it is
permissible to offset ambient temperatures lower than 40°C by way of compensation. The following tables specify the
permissible currents for SINAMICS S120 Cabinet Modules as a function of installation altitude and ambient
temperature for the different degrees of protection. The specified values already take into account the permissible
compensation between installation altitude and ambient temperature less than 40°C (air temperature where the air
enters the Cabinet Module). The values are valid only on condition that the cabinet is installed in such a way as to
guarantee the required cooling air flow stipulated in the technical data.
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20 °C 25 °C
20 °C 25 °C
30 °C 35 °C
100 %
30 °C 35 °C
100 %
40 °C 45 °C
93.3 %
40 °C 45 °C
93.3 % 86.7 %
50 °C
86.7 %
50 °C
80.0 %