Derating Data; Derating Data For Chassis Format; General - Siemens SINAMICS S120 Manual

2.11

Derating data

2.11.1

Derating data for chassis format

2.11.1.1

General

SINAMICS S120 Cabinet Modules as well as the associated system components are
dimensioned for an ambient temperature of 40 °C and installation altitudes up to 2000 m
above sea level.
S120 Cabinet Modules include Basic Line Modules, Smart Line Modules, Active Line
Modules and Motor Modules with power units, chassis format including the associated
system components, (e.g. line filter, chassis Braking Modules and motor filter), as well as
Line Connection Modules and Auxiliary Power Supply Modules.
Exceptions are S120 Cabinet Modules with power units, Booksize format and the Central
Braking Modules. This derating data can be taken from Chapter "Cabinet Modules" in
subchapter "Derating data" of the particular S120 Cabinet Modules.
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 (air intake temperature where the air enters 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 (air intake temperature where the air enters the
cabinet unit) and installation altitude for cabinet units with degree of protection IP54
Installation altitude
above sea level in m
0 ... 2000
Cabinet Modules
Manual, (GH5), 05/2010, A5E03263538A
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 %
Current derating factor
30 °C 35 °C
100 % 100 %
Current derating factor
30 °C 35 °C
100 % 100 %
System overview
2.11 Derating data
40 °C 45 °C
100 % 93.3 %
40 °C 45 °C
93.3 % 86.7 %
50 °C
86.0 %
50 °C
80.0 %
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