SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
386/528
factors for power units in Chassis format and are specified in Catalog PM21 / SINAMICS S120 drive system. They
are also valid for SINAMICS S120 Cabinet Modules with power units in Booksize format in degrees of protection
IP20, IP21, IP23, IP43 and IP54.
7.2.2.2 Degrees of protection of air-cooled S120 Cabinet Modules
The EN 60529 standard covers the protection of electrical equipment by means of housings, covers or equivalent,
and includes:
1. Protection of persons against accidental contact with live or moving parts within the housing and protection of the
equipment against the penetration of solid foreign particles (shock protection)
2. Protection of the equipment against the penetration of water (water protection)
3. Abbreviations for the internationally agreed degrees of protection.
The degrees of protection are specified by abbreviations comprising the code letters IP and two digits.
The following table lists the degrees of protection in which air-cooled S120 Cabinet Modules are available. IP20 is
standard. Higher degrees of protection are optionally available.
Degree of
protection
First digit
(protection against accidental contact and solid matter)
Second digit
(protection of the equipment against the penetration of water)
IP20 Protected against solid matter,
diameter 12.5 mm and larger
No water protection
IP21 Protected against solid matter,
diameter 12.5 mm and larger
Protected against drip water
Vertically falling drip water must not have a harmful effect.
IP23 Protected against solid matter,
diameter 12.5 mm and larger
Protected against spray water
Water sprayed on both sides of the vertical at an angle of up to
60° must not have a harmful effect
IP43 Protected against solid matter,
diameter 1 mm and larger
Protected against spray water
Water sprayed on both sides of the vertical at an angle of up to
60° must not have a harmful effect
IP54 Protected against dust,
Entry of dust is not totally prevented, but the entry of
dust is not allowed in such quantities that the operation
of equipment or the safety will be impaired.
Protected against splash water.
Water splashing against the enclosure from any direction must
not have a harmful effect.
Degrees of protection of air-cooled S120 Cabinet Modules: Basic version is IP20, higher degrees of protection are available
as option M21 – M54
On the precondition that the ambient conditions are within the specified limits, no additional equipment such as
cooling units, air extractors, etc. need to be provided for air-cooled cabinet units irrespective of their degree of
protection. Only the current derating factors for degree of protection IP54 and the different cabinet heights for the
higher degrees of protection IP21 – IP54 need to be taken into account at the configuring stage:
Cabinet height: IP20: 2200 mm / air is expelled upwards through perforated roof panel
IP21: 2450 mm / air is expelled upwards through perforated roof panel + add. drip plate
IP23 – IP54 2600 mm / air is expelled forwards through additional roof cover incl. filter mats
7.2.2.3 Required DC busbar cross-sections and maximum short-circuit currents
DC busbars are not integrated in S120 Cabinet Modules as standard. These must be selected as a "required option"
for Cabinet Modules. The DC busbars must be dimensioned according to the load requirements, operating conditions
and the individual configuration of the cabinet line-up. The optional "required assignment" helps to reduce
dimensioning errors and forces the planner to carefully consider the DC busbar selection with respect to the currents
which can potentially occur in normal operation and under short-circuit conditions.
The required busbar option does not apply to the following Cabinet Modules:
§ Line Connection Modules
§ Auxiliary Power Supply Modules
These Cabinet Modules can be installed within the cabinet line-up in such a way that no DC busbars are required
(e.g. at the beginning or the end of the cabinet line-up).
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