Siemens SINAMICS S150 - Parallel Connections of Motor Modules; General; Minimum Motor Cable Lengths for Motors with Common Winding System

SINAMICS S120 Cabinet Modules
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
474/528
7.3.7.3 Parallel connections of Motor Modules
7.3.7.3.1 General
Parallel connections may only include Motor Modules of the same type with identical voltage rating and output. If
SINAMICS S120 Motor Modules are connected in parallel, imbalances in the current distribution can occur despite
the current compensation control. As a result, a current derating factor of 5 % applies to parallel connections.
In the case of motors with a common winding system, it is important to observe the specified minimum cable lengths
between the Motor Modules and the motor in order to ensure that the parallel-connected Motor Modules are
decoupled. If it is not possible to limit the lengths of cables used to the minimum prescribed length, motor reactors or
filters must be installed.
For further information about parallel connections, please refer to section "Parallel connections of converters" of
chapter "Fundamental Principles and System Description".
7.3.7.3.2 Minimum motor cable lengths for motors with common winding system
The table below specifies the minimum required motor cable lengths for parallel connections of SINAMICS S120
Motor Modules from the liquid-cooled S120 Cabinet Modules range. The length specification refers to the distance
between the output of each Motor Module and the motor terminal box as measured along the motor cable.
Motor Module Motor supply cable
Frame size
P
rated
at 400 V
[kW]
I
rated
[A]
Minimum length
1)
[m]
Supply voltage 510 V bis 720 V DC
HXL 315 605 13
HXL 400 745 10
HXL 450 840 9
JXL 560 985 8
JXL 710 1260 6
JXL 800 1330 5
JXL 800 1405 5
Motor Module Motor supply cable
Motor Module Motor supply cable
Frame size
P
rated
at 500 V
[kW]
I
rated
[A]
Minimum length
1)
[m]
Frame size
P
rated
at
690 V
[kW]
I
rated
[A]
Minimum length
1)
[m]
Supply voltage 675 V bis 900 V DC
2)
Supply voltage 890 V bis 1035 V DC
2)
HXL 315 465 18 HXL 450 465 25
HXL 400 575 15 HXL 560 575 20
HXL 500 735 13 HXL 710 735 18
HXL 560 810 13 HXL 800 810 18
JXL 560 810 11 JXL 800 810 15
JXL 710 1025 8.5 JXL 1000 1025 10
JXL 900 1270 7 JXL 1200 1270 8
JXL 1000 1560 6 JXL 1500 1560 7
1)
permissible tolerance: –20 %
2)
These values apply to module variants with line supply voltages of 500 V to 690 V 3AC (MLFB 6SL3725-1TGxx-xAA3).
Min. cable lengths for parallel connections of S120 Motor Modules connected to motors with a common winding system