SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
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Installation altitude
above sea level
Current derating factor
at an ambient temperature (inlet air) of
m 20 °C 25 °C 30 °C 35 °C 40 °C 45 °C 50 °C
0 ... 2000 93.3 % 86.7 %
2001 ... 2500 96.3 %
2501 ... 3000 100 % 98.7 %
3001 ... 3500
3501 ... 4000 96.3 %
inadmissible range
4001 ... 4500 97.5 %
4501 ... 5000 98.2 %
Current derating factors as a function of installation altitude and ambient temperature (inlet air)
for SINAMICS S120 Cabinet Modules (Chassis) in degrees of protection IP20, IP21, IP23 and IP43
Installation altitude
above sea level
Current derating factor
at an ambient temperature (inlet air) of
m 20 °C 25 °C 30 °C 35 °C 40 °C 45 °C 50 °C
0 ... 2000 93.3 % 86.7 % 80.0 %
2001 ... 2500 100 % 96.3 % 89.8 %
2501 ... 3000 98.7 % 92.5 %
3001 ... 3500 94.7 %
3501 ... 4000 96.3 % 90.7 %
inadmissible range
4001 ... 4500 97.5 % 92.1 %
4501 ... 5000 93.0 %
Current derating factors as a function of installation altitude and ambient temperature (inlet air)
for SINAMICS S120 Cabinet Modules (Chassis) in degree of protection IP54
2nd measure: Use of an isolating transformer to reduce transient overvoltages in accordance with IEC 61800-5-1
The isolating transformer which is used quasi as standard to supply SINAMICS converters for virtually every type of
application reduces the overvoltage category III (for which the units are dimensioned) down to the overvoltage
category II. As a result, the requirements of the insulation strength of the air are less stringent. Additional voltage
derating (reduction in input voltage) is not required if the following boundary conditions are fullfilled:
· The isolating transformer must be supplied from a low-voltage or medium-voltage network. It must not be
supplied directly from a high-voltage network.
· The isolating transformer may be used to supply one or more drives or drive line-ups.
· The cables between the isolating transformer and the S120 Infeed or the S120 Infeeds must be installed
such that there is absolutely no risk of a direct lightning strike, i.e. overhead cables must not be used.
· Drives with Basic Infeed and Smart Infeed can be operated on the following types of power supply system:
§ TN systems with grounded star point (no grounded outer conductor).
§ IT systems (the period of operation with a ground fault must be limited to the shortest possible
time).
· Drives with Active Infeed can be operated on the following types of power supply system:
§ TN systems with grounded star point (no grounded outer conductor, no IT systems).
The measures described above are permissible for the following drive line-ups with SINAMICS S120 Cabinet
Modules. They must be applied to all Cabinet Modules in the drive line-up:
· Drives with Basic Infeed on all voltage levels (380 V – 480 V 3AC and 500 V – 690 V 3AC).
· Drives with Smart Infeed on all voltage levels (380 V – 480 V 3AC and 500 V – 690 V 3AC).
· Drives with Active Infeed on voltage level 380 V – 480 V 3AC
(Drives with Active Infeed for 500 V – 690 V 3AC on request).
7.2.2.1.2 Derating data for S120 Cabinet Modules with power units in Booksize format
SINAMICS S120 Cabinet Modules with power units in Booksize format and associated system components are rated
for an ambient temperature of 40 C and installation altitudes of up to 1000 m above sea level. If SINAMICS S120
Cabinet Modules with power units in Booksize format are operated at ambient temperatures higher than 40°C and/or
installation altitudes higher than 1000 m above sea level, the corresponding derating factors must be applied as a
function of the ambient temperature and/or the installation altitude. These derating factors differ from the derating
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