Siemens SINAMICS G130 Engineering Manual page 225

In order to ensure that all the air flow produced by the hood-mounted fan passes through the Chassis unit and cannot
flow along the sides of the Chassis unit, horizontal partitions must be installed inside the cabinet according to the
illustration below (partitions shown in orange). This is essential to ensure that the heat loss of the Chassis unit
dissipated to the air inside the Chassis unit can be effectively expelled from the interior of the Chassis unit in cabinets
with degree of protection > IP21. If more than one fan is mounted in the hood, the individual areas should also be
vertically partitioned from one another where possible.
Partitioning requirements in the converter cabinet
With fully enclosed converter cabinets with degree of protection IP55 in which air from inside the cabinet cannot be
exchanged with air outside the cabinet, a fan must be installed inside the cabinet in order to circulate the air.
With very low power losses of a few hundred watts per cabinet panel, it is basically possible to dissipate the heat
losses via the cabinet surface. Formulae designed to calculate the magnitude of power losses which can be
dissipated via the cabinet surface are given in subsection "Physical fundamental principles" of section "Cabinet
design and air conditioning" in chapter "General Engineering Information for SINAMICS".
With higher power losses of more than a few hundred watts per cabinet panel, additional air-to-water heat
exchangers must be mounted in the converter cabinet so as to transfer the heat loss from the internal air to the
coolant. With this system as well, suitable partitions must be mounted inside the cabinet in order to guide the air in
such a way that the air of the internal air circuit passes through the Chassis units and other components which need
to be cooled as well as through the air-to-water heat exchanger. The power rating of the fan required and of the air-
to-water heat exchanger must be selected according to the total power losses to be dissipated.
Horizontal installation inside a cabinet
liquid-cooled SINAMICS S120 units are also suitable for horizontal mounting inside a converter cabinet. It must be
noted, however, that the units may only be installed in a horizontal position on the back panel.
In order to prevent heat from accumulating inside the unit when a Chassis unit is installed horizontally, an external
fan must always be installed at the top end of the horizontal Chassis unit (irrespective of the degree of protection of
the cabinet) to expel the heat losses dissipated from the Chassis unit to the air. Furthermore, a panel – referred to
below as the air distribution panel – must be provided above the Chassis unit. The purpose of this panel is to ensure
that air is sucked through the IP20 covers at the front of the Chassis unit and evenly distributed over the entire length
of the unit. With this arrangement, the components mounted near the bottom end of the Chassis unit will also be
cooled within the permissible temperature range. The components required for horizontal mounting of the Chassis
unit are shown in the diagram below.
Fundamental Principles and System Description
SINAMICS Engineering Manual – November 2015
Engineering Information
Liquid-cooled Chassis unit
(type / frame size)
Power Module / FL
Power Module / GL
Basic Line Module / FBL
Basic Line Module / GBL
Active Line Module / FXL
Motor Module FXL
Active Line Module / GXL
Motor Module GXL
Active Line Module / HXL
Motor Module HXL
Active Line Module / JXL
Motor Module JXL
Mounting height of partition from bottom edge of
Chassis
Ó Siemens AG
Mounting height
of horiz. partition
from bottom
edge of Chassis
[ mm ]
140
290
480
910
150
480
340
800
225/528