Checking The Total Cable Length For Multi-Motor Drives - Siemens SINAMICS G130 Engineering Manual

SINAMICS S120
Engineering Information

6.10 Checking the total cable length for multi-motor drives

In the case of SINAMICS S120 multi-motor drives, the total cable length (i.e. the sum of the motor cable lengths for
all the Motor Modules that are fed by a common Infeed Module and via a common DC busbar) must be restricted.
This is necessary in order to ensure that the resulting total capacitive leakage current Σ I
leakage currents I generated from the individual Motor Modules 1...n), which depends on the overall motor cable
Leak
length, does not overload the Infeed Module if this current flows back to the DC busbar via the line filter of the Infeed
Module or via the supply system, and the Infeed Module itself.
The following table specifies the values for the permissible total cable length l
S120 Infeed Modules when feeding multi-motor drives. The following must be noted here:
· The total cable length l
have higher output currents and more than one motor cable routed in parallel, that each of the parallel
cables must be taken into account when the total cable length is calculated.
· The total cable length l
1.5 times higher are permissible.
· When S120 Infeed Modules are connected in parallel, the specified permissible total cable length l
multiplied by the number of Infeed Modules connected in parallel. A derating of 7.5% must be observed for
Basic Line Modules and Smart Line Modules, and a derating of 5% for Active Line Modules.
· The values apply regardless of the type of supply system, i.e. for both grounded TN supply systems and
non-grounded IT supply systems.
SINAMICS S120 Frame size
Infeed Module
Supply voltage 380 V to 480 V 3AC
Basic Line Module FBL / FB
Basic Line Module FBL / GB
Basic Line Module GBL / GD
Smart Line Module GX
Smart Line Module HX / JX
Active Line Module FX / GXL / GX
Active Line Module HXL / HX
JXL / JX
Supply voltage 500 V to 690 V 3AC
Basic Line Module FBL / FB
Basic Line Module GBL / GB
Basic Line Module GD
Smart Line Module GX
Smart Line Module HX / JX
Active Line Module HXL / HX
JXL
Permissible total cable length for SINAMICS S120 Infeed Modules feeding multi-motor drives
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is the cable length that is really routed. This means in the case of drives which
perm
applies to shielded motor cables. In the case of unshielded motor cables, values
perm
Rated power at
400 V / 690 V
[ kW ]
200 to 400
560 to 710
830 to 900
250 to 355
500 to 800
132 to 300
380 to 900
250 to 630
900 to 1370
1500
450
710 bis 1400
630 to 1700
JX
/
perm
Input current at Permissible total
400 V / 690 V cable length for
shielded cables
l
perm
[ A ]
[ m ]
365 to 710 2600
1010 to 1265 4000
1420 to 1630 4800
463 to 614 4000
883 to 1430 4800
210 to 490 2700
605 to 1405 3900
260 to 730 1500
925 to 1350 2250
1580 2750
463 2250
757 bis 1430 2750
575 to 1560 2250
(sum of the capacitive
Leak
for the various types of SINAMICS
perm
must be