Derating Measures - Siemens SINAMICS S120 Device Manual
Cabinet modules nema
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- Function manual (1094 pages) ,
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Permissible output current as a function of the ambient temperature
If SINAMICS S120 Cabinet Modules are operated at ambient temperatures above 104 °F
(40 °C), the output current must be reduced. Ambient temperatures above 122 °F (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 factors 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 degrees of protection IP20 / IP21/ IP23 (NEMA1 fil-
tered) / IP43
Installation altitude
above sea level
0 ... 6600 ft (0 to 2000 m)
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 IP54 enclosure (NEMA12 ventilated)
Installation altitude
above sea level
0 ... 6600 ft (0 to 2000 m)
Installation altitudes over 6,600 ft and up to 16,500 ft (2,000 m to 5,000 m) above MSL
When operating SINAMICS S120 Cabinet Modules NEMA at altitudes over 6,600 ft
(2,000 m) above sea level, keep in mind that as the altitude increases, the air pressure and
therefore also the density of the air decrease. The cooling effect as well as the insulating
capability of the air decrease as a result of the lower air density.
The units can be installed at altitudes over 6,600 ft and up to 16,500 ft (2,000 m to 5,000 m)
if the following derating measures are applied.
2.11.2.2
Derating measures
The units can be installed at altitudes over 6,600 ft and up to 16,500 ft (2,000 m to 5,000 m)
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
(380 to 480 V 3 ph. AC and 500 to 690 V 3 ph. AC).
● Drives with Smart Line Modules in all voltage levels
(380 to 480 V 3 ph. AC and 500 to 690 V 3 ph. AC).
● Drives with Active Line Modules in the voltage level 380 to 480 V 3 ph. AC
(drives with Active Line Modules for 500 to 690 V 3 ph. AC on request).
Cabinet Modules NEMA
Manual, 04/2014, A5E03586450A
at an ambient temperature (air intake temperature) of
68 °F
77 °F
(20 °C)
(25 °C)
100 %
100 %
at an ambient temperature (air intake temperature) of
68 °F
77 °F
(20 °C)
(25 °C)
100 %
100 %
Current derating factor
86 °F
95 °F
(30 °C)
(35 °C)
100 %
100 %
Current derating factor
86 °F
95 °F
(30 °C)
(35 °C)
100 %
100 %
System overview
2.11 Derating data
104 °F
113 °F
(40 °C)
(45 °C)
100 %
93.3 %
104 °F
113 °F
(40 °C)
(45 °C)
93.3 %
86.7 %
122 °F
(50 °C)
86.7 %
122 °F
(50 °C)
80.0 %
39
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