Siemens SINAMICS S120 - Parallel Connections of Motor Modules; General; Minimum Motor Cable Lengths for Motors with Common Winding System

SINAMICS S120
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
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6.11 Parallel connections of Motor Modules
6.11.1 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".
6.11.2 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 Chassis format with air cooling (frame sizes FX, GX, HX and JX) and with liquid cooling (frame
sizes FXL, GXL, HXL and JXL). 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 400V
[kW]
I
rated
[A]
Minimum length
1)
[m]
Anschlussspannung DC 510 V bis 720 V
FX / FXL 110 210 30
FX / FXL 132 260 27
GX / GXL 160 310 20
GX 200 380 17
GX / GXL 250 490 15
HX / HXL 315 605 13
HX / HXL 400 745 10
HX / HXL 450 840 9
JX / JXL 560 985 8
JX / JXL 710 1260 6
JX / JXL 800 1330 5
JX / JXL 800 1405 5
Motor Module Motor supply cable
Motor Module Motor supply cable
Frame size
P
rated
at 500V
[kW]
I
rated
[A]
Minimum length
1)
[m]
Frame size
P
rated
at 690V
[kW]
I
rated
[A]
Minimum length
1)
[m]
Anschlussspannung DC 675 V bis 900 V
2)
Anschlussspannung DC 890 V bis 1035 V
2)
FX 55 85 80 FX 75 85 100
FX / FXL 55 100 72 FX / FXL 90 100 90
FX 75 120 65 FX 110 120 80
FX / FXL 90 150 55 FX / FXL 132 150 70
GX 110 175 50 GX 160 175 60
GX / GXL 132 215 40 GX / GXL 200 215 50
GX 160 260 32 GX 250 260 40
GX / GXL 200 330 25 GX / GXL 315 330 30
HX 250 410 20 HX 400 410 25
HX / HXL 315 465 18 HX / HXL 450 465 25
HX / HXL 400 575 15 HX / HXL 560 575 20
JX / HXL 500 735 13 JX / HXL 710 735 18
HXL 560 810 13 HXL 800 810 18
JX / JXL 560 810 11 JX / JXL 800 810 15
JX 630 910 10 JX 900 910 12
JX / JXL 710 1025 8.5 JX / JXL 1000 1025 10
JX / JXL 900 1270 7 JX / JXL 1200 1270 8
JXL 1000 1560 6 JXL 1500 1560 7
1)
permissible tolerance: –20 %
2)
These values apply to Motor Modules with line supply voltages of 500 V to 690 V 3AC (order number 6SL3x2x-1TGxx-xAA3).
Min. cable lengths for parallel connections of S120 Motor Modules connected to motors with a common winding system