Parallel Connections Of Motor Modules; General; Minimum Motor Cable Lengths For Motors With Common Winding System - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120 Cabinet Modules
Engineering Information
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
P at 400 V
rated
Frame size
[kW]
Supply voltage 510 V bis 720 V DC
HXL 315
HXL 400
HXL 450
JXL 560
JXL 710
JXL 800
JXL 800
Motor Module
P at 500 V
rated
Frame size
[kW]
Supply voltage 675 V bis 900 V DC
HXL 315
HXL 400
HXL 500
HXL 560
JXL 560
JXL 710
JXL 900
JXL 1000
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
SINAMICS Engineering Manual – November 2015
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Motor supply cable
1)
I Minimum length
rated
[A]
[m]
605 13
745 10
840 9
985 8
1260 6
1330 5
1405 5
Motor supply cable Motor Module
1)
I Minimum length
rated
[A]
[m]
2)
465 18
575 15
735 13
810 13
810 11
1025 8.5
1270 7
1560 6
P at 690 V
Frame size
rated
[kW]
Supply voltage 890 V bis 1035 V DC
HXL 450
HXL 560
HXL 710
HXL 800
JXL 800
JXL 1000
JXL 1200
JXL 1500
Motor supply cable
1)
I Minimum length
rated
[A]
[m]
2)
465 25
575 20
735 18
810 18
810 15
1025 10
1270 8
1560 7