Derating Measures - Siemens SINAMICS S120 Manual

System overview
2.11 Derating data
Permissible output current as a function of the ambient temperature
If SINAMICS S120 Cabinet Modules are operated at ambient temperatures higher than
40 °C, then the output current must be reduced. Ambient temperatures higher than 50 °C are
not permissible. The following tables specify the permissible output current as a function of
the ambient temperature for the various degrees of protection.
Table 2- 3 Current derating as a function of ambient temperature (inlet air temperature at the air inlet of the cabinet unit)
and installation altitude for cabinet units with degree of protection IP20/IP21/IP23/IP43
Installation altitude
above sea level in m
0 ... 2000
Table 2- 4 Current derating as a function of the ambient temperature (inlet air temperature at the air inlet of the cabinet
unit) and installation altitude for cabinet units with degree of protection IP54
Installation altitude
above sea level in m
0 ... 2000
Installation altitudes greater than 2000 to 5000 m above sea level
If SINAMICS S120 Cabinet Modules are operated at installation altitudes greater than 2000
m above sea level, then it must be taken into account that with increasing installation
altitude, the air pressure and therefore the density of the air decreases. The cooling effect as
well as the insulating capability of the air decrease as a result of the lower air density.
Installation altitudes greater than 2000 to 5000 m can be achieved if the derating measures
in the following chapter are applied.
2.11.2.2

Derating measures

Installation altitudes greater than 2000 to 5000 m can be achieved if the following derating
measures are applied. These measures apply for the following drive configurations with
SINAMICS S120 Cabinet Modules:
● Drives with Basic Line Modules at all voltage levels
● Drives with Smart Line Modules in all voltage levels
● Drives with Active Line Modules in the voltage level 3 AC 380 to 480 V
40
at an ambient temperature (air intake temperature) of
20 °C 25 °C
100 % 100 %
at an ambient temperature (air intake temperature) of
20 °C 25 °C
100 % 100 %
(3 AC 380 to 480 V and 3 AC 500 to 690 V).
(3 AC 380 to 480 V and 3 AC 500 to 690 V).
(drives with Active Line Modules for 3 AC 500 to 690 V on request).
Current derating factor
30 °C 35 °C
100 % 100 %
Current derating factor
30 °C 35 °C
100 % 100 %
40 °C 45 °C
100 % 93.3 %
40 °C 45 °C
93.3 % 86.7 %
Cabinet Modules
Manual, 03/2013, A5E03263538A
50 °C
86.7 %
50 °C
80.0 %