Information About Cooling Circuit Configuration - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information
Note:
The derating factors of the two charts must not be multiplied. For dimensioning purposes, it is the least favorable
derating factor of the two charts that applies which means that a total derating factor of 0.9 is applicable under worst-
case conditions.
Current derating as a function of the inflow coolant
temperature of the converter-side deionized water circuit
for degrees of protection < IP55 and IP55
Installation altitudes over 2000 m and up to 4000 m above sea level
The liquid-cooled S120 Cabinet Modules and associated system components are rated for an installation altitude of
up to 2000 m above sea level and a coolant temperature in the inflow line of the deionized water circuit of 45 °C (for
degrees of protection < IP55) or of 40 °C (for degree of protection IP55), and for an ambient temperature of 45 °C. If
liquid-cooled 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. As a result of the drop in air density the cooling effect and the insulation strength of the air are
reduced. Under these conditions, it is therefore necessary to reduce the permissible ambient temperature and input
voltage.
The following charts indicate the permissible ambient temperature and input voltage as a function of the installation
altitude for altitudes of over 2000 m up to 4000 m.
Ambient temperature derating as a function of altitude
7.3.4.5

Information about cooling circuit configuration

General information about the converter-side deionized water circuit
The power units of the liquid-cooled S120 Cabinet Modules are connected in parallel with respect to the liquid flow of
the inflow and return flow line in the converter-side deionized water circuit. The pipe diameter is sufficiently
dimensioned to ensure that the pressure drop across the common flow line (inflow and return flow) is almost
negligible. The pressure difference between the inflow and return flow lines in the deionized water circuit is generated
by the pump in the Heat Exchanger Module.
SINAMICS Engineering Manual – November 2015
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Ó Siemens AG
Current derating as a function of ambient temperature
Input voltage derating as a function of altitude