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

7.2.8.3

Parallel connections of Motor Modules

7.2.8.3.1 General

Motor Modules connected in parallel must always be identical in terms of type, voltage rating and power rating. If
SINAMICS S120 Motor Modules are connected in parallel, imbalances in current distribution can occur despite the
current compensation control. This means that a current derating factor of 5 % must be applied 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 realize cabling with the minimum required cable length, motor reactors or filters must
be installed.
For detailed information on the subject of parallel converters, refer to section "Parallel connections of converters" in
chapter "Fundamental Principles and System Description".

7.2.8.3.2 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 in air-cooled Cabinet Modules format, whereby the given length is the distance between the output of
each Motor Module and the motor terminal box as measured along the motor cable.
Motor Module
P at 400V
rated
Frame size
[kW]
Supply voltage 510 V – 720 V DC
FX 110
FX 132
GX 160
GX 200
GX 250
HX 315
HX 400
HX 450
JX 560
JX 710
JX 800
Motor Module
P at 500V
rated
Frame size
[kW]
Supply voltage 675 V – 900 V DC
FX 55
FX 55
FX 75
FX 90
GX 110
GX 132
GX 160
GX 200
HX 250
HX 315
HX 400
JX 500
JX 560
JX 630
JX 710
JX 900
1)
permissible tolerance: –20 %
2)
These values apply to Motor Modules with line supply voltages of 500 V to 690 V 3AC (order number 6SL3720-1TGxx-xAA3).
Min. cable lengths for parallel connections of S120 Motor Modules connected to motors with a common winding system
Motor supply cable
1)
I Minimum length
rated
[A]
[m]
210 30
260 27
310 20
380 17
490 15
605 13
745 10
840 9
985 8
1260 6
1405 5
Motor supply cable Motor Module
1)
I
Minimum length
rated
[A]
[m]
2)
85 80
100 72
120 65
150 55
175 50
215 40
260 32
330 25
410 20
465 18
575 15
735 13
810 11
910 10
1025 8.5
1270 7
SINAMICS Engineering Manual – November 2015
SINAMICS S120 Cabinet Modules
Engineering Information
P at 690V
Frame size rated
[kW]
Supply voltage 890 V – 1035 V DC
FX 75
FX 90
FX 110
FX 132
GX 160
GX 200
GX 250
GX 315
HX 400
HX 450
HX 560
JX 710
JX 800
JX 900
JX 1000
JX 1200
Motor supply cable
I
Minimum length
rated
[A] [m]
2)
85 100
100 90
120 80
150 70
175 60
215 50
260 40
330 30
410 25
465 25
575 20
735 18
810 15
910 12
1025 10
1270 8
427/528
Ó Siemens AG
1)