Fundamental Principles and System Description
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
129/528
Motor Modules 380 V to 480 V 3AC Motor Modules 500 V to 690 V 3AC
Power
[ kW ]
Frame size Peak short-circuit current
[ kA ]
Power
[ kW ]
Frame size Peak short-circuit current
[ kA ]
110
FX / FXL 1.8
75
FX 1.4
132
FX / FXL 2.2
90
FX / FXL 1.6
160
GX / GXL 2.7
110
FX 2.0
200
GX 3.3
132
FX / FXL 2.4
250
GX / GXL 4.2
160
GX 2.9
315
HX / HXL 5.3
200
GX / GXL 3.6
400
HX / HXL 6.7
250
GX 4.5
450
HX / HXL 7.5
315
GX / GXL 5.7
560
JX / JXL 9.4
400
HX 7.2
710
JX 11.9
450
HX / HXL 8.1
800
JX / JXL 13.4
560
HX / HXL 10.1
-
- -
710
JX / JXL 12.8
-
- -
800
HXL 14.4
-
- -
800
JX / JXL 14.4
-
- -
900
JX 16.2
-
- -
1000
JX / JXL 18.0
-
- -
1200
JX / JXL 21.6
- - - 1500 JXL 27.0
Contribution of individual S120 Motor Modules to the total short-circuit current on the DC busbar
To dimension the DC busbar, it is first of all necessary to calculate the normal operating currents and to select the
cross-sections of the DC busbar accordingly. The total peak short-circuit current which could potentially develop in
the event of a short circuit must then be calculated. Finaly it must be verified that the selected DC busbar can
withstand the calculated peak short-circuit current. For further information about the peak short-circuit currents
permitted for the DC busbars of SINAMICS S120 Cabinet Modules, please refer to section "Required DC busbar
cross-sections and maximum short-circuit currents" in chapter "General Information about Modular Cabinet Units
SINAMICS S120 Cabinet Modules".
1.8.2.5 Maximum power rating of drive configurations at a common DC busbar
Within the scope of the SINAMICS S120 modular drive system, it is possible to build drive configurations in which a
S120 Infeed (Basic Infeed, Smart Infeed or Active Infeed) comprising one or up to four parallel-connected S120 Line
Modules supplies a DC busbar with several S120 Motor Modules. With a line voltage of 690 V, therefore, up to 6 MW
of power (4 • 1500 kW) can be fed into the busbar. The DC busbar current reaches values of up to 7500 A. The
busbar itself can extend to up to 30 m or more in length depending on the ratings of the Motor Modules and the
number of other components which might be connected (e.g. Braking Modules, dv/dt filters or output-side switches).
The system of modular, type-tested SINAMICS S120 built-in units in Chassis format and the associated system
components are capable of supplying up to 6 MW of infeed power (4 • 1500 kW) to the DC busbar with a line voltage
of 690 V, provided that the cabinet builder has dimensioned the drive configuration properly in terms of its electrical,
thermal and mechanical properties.
Adequate fuse protection for the drive configuration must be provided on the line side. The power cables and bars,
especially the DC busbar, must be dimensioned with sufficient thermal and mechanical strength to tackle with short
circuits in the system. Furthermore, to cope with ground faults in the system, PE bars must be properly dimensioned
and connections of sufficient low resistance must be provided between the S120 Chassis and the relevant cabinet
frames and between individual cabinet frames in the drive configuration. To ensure sufficient cooling, the required
flow of cooling air must be provided using air ventilation holes of adequate cross-section and using partitions for
adequate air guidance. To ensure fault-free operation, especially in large configurations of high-power drives, EMC-
compliant cable routing and shield connections must be implemented. Therefore it is absolutely essential to take care
of the following rules:
· Provide the recommended line-side protection in form of fuses or circuit breakers, and ensure that the circuit
breakers are correctly set for the relevant plant conditions.
· Observe the permissible short-circuit currents of the DC busbar.
· Provide the recommended protection for Motor Modules connected to the DC busbar.
· Comply with the required cross-sections for supply system connection, DC busbar and motor connection.
· Comply with the recommended length and topology of the DC busbar.
· Comply with the required ventilation hole cross-sections and the recommended partitioning for air-guidance.
· Provide adequate air conditioning of the electrical equipment room (cooling capacity, volumetric flow).
· Comply with the EMC installation guideline.
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