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

█

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 lengths 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 FB
Basic Line Module GB
Basic Line Module GD
Smart Line Module GX
Smart Line Module HX+JX
Active Line Module FX+GX
Active Line Module HX+JX
Supply voltage 500 V to 690 V 3AC
Basic Line Module FB
Basic Line Module GB
Basic Line Module GD
Smart Line Module GX
Smart Line Module HX+JX
Active Line Module HX+JX
Permissible total cable length for SINAMICS S120 Infeed Modules feeding multi-motor drives
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 Input current at
400 V / 690 V 400 V / 690 V
[ kW ]
200 to 400 365
560 to 710 1010 to 1265
900
250 to 355 463
500 to 800 883
132 to 300 210
380 to 900 605
250 to 560 260
900 to 1100 925
1500
450
710 to 1400 757
560 to 1400 575
Engineering Information
for the various types of SINAMICS
perm
Permissible total
cable length for
shielded cables
l
perm
[ A ]
[ m ]
to 710 2600
4000
1630 4800
to 614 4000
to 1430 4800
to 490 2700
to 1405 3900
to 575 1500
to 1180 2250
1580 2750
463 2250
to 1430 2750
to 1270 2250
SINAMICS Engineering Manual - May 2008
SINAMICS S120
(sum of the capacitive
Leak
must be
perm
239/396
© Siemens AG