Siemens SINAMICS G130 Engineering Manual page 282

SINAMICS G130
Engineering Information
Installation altitudes > 2000 m to 5000 m above sea level
SINAMICS G130 converters 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 G130 converters are to be operated at altitudes
higher 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 G130 converters can be installed at altitudes over 2000 m up to 5000 m if the following two measures are
utilized.
1st measure: Reduction of ambient temperature and output 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 converter by lowering the output current. In the latter case, it is
permissible to offset ambient temperatures lower than 40°C by way of compensation. The table below specifies the
permissible output currents for SINAMICS G130 chassis units as a function of installation altitude and ambient
temperature. The stated values allow for the permissible compensation between installation altitude and ambient
temperatures lower than 40 C (air temperature at the air inlet of the Power Modules). The values are valid only on
condition that the cabinet is designed and installed in such a way as to guarantee the required cooling air flow
stipulated in the technical data. For further information, please refer to section "Cabinet design and air conditioning" in
chapter "General Engineering Information for SINAMICS".
Installation altitude
above sea level
m
0 ... 2000
2001 ... 2500
2501 ... 3000
3001 ... 3500
3501 ... 4000
4001 ... 4500
4501 ... 5000
Current derating factors as a function of installation altitude and ambient temperature (inlet air) for SINAMICS G130
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 on the insulation strength of the air are less stringent. Additional voltage
derating (reduction in input voltage) is not necessary if the following boundary conditions are fulfilled:
·
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 converters.
·
The cables between the isolating transformer and the converter or converters must be installed such that
there is absolutely no risk of a direct lightning strike, i.e. overhead cables must not be used.
·
The following power supply system types are permissible:
§ 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).
The measures described above are permissible for all SINAMICS G130 converters in all voltage ranges
(380 V – 480 V 3AC / 500 V – 600 V 3AC / 660 V – 690 V 3AC).
SINAMICS Engineering Manual – November 2015
282/528
Ó Siemens AG
Current derating factor
at an ambient temperature (inlet air) of
20 °C 25 °C 30 °C
100 %
96.3 %
97.5 %
98.2 %
35 °C 40 °C 45 °C
93.3 %
96.3 %
98.7 %
inadmissible range
50 °C 55 °C
86.7 % 80.0 %