Siemens SIMOTICS T-1FW68, Configuration Manual

Page: 156 / 194

Electrical connection
8.3 System integration
1FW68 radial segment motors
154
Configuration Manual, 08/2021, A5E51132930B AA
8.3.6 Current-carrying capacity of the cables
To electrically connect stator segments with a current demand of up to 66 A,
combination cables with a cross-section of up to 16 mm
2
are used. The cables must have
4 conductors for the power and 4 conductors for the signals. The cross-section for each
of the signal conductors is 0.5 mm
2
.
You must use single conductor cables for higher current demands. You require a total of
3 power cables for each stator segment. An additional cable is required for the protective
conductor connection. Further, you require an additional signal cable.
Note
Power cable conductor cross-section
The cross-section of the power cable conductors is based on the current I
0
. I
0
is the
current of the stator segment at torque M
0
and speed n = 1 r/min.
The current I
0
of the stator segment must be less than the current-carrying capacity of
the cable.
The tables below state the maximum permissible current I
0
of the stator segment for
different cross-sections of the power cable conductors.
The data on the current-carrying capacity I for combined cables in the following table are
based on IEC 60204-1.
Table 8- 7 Current-carrying capacity with method of installation C *) for combined cables
Cross-section for power conductors in mm
2
Maximum permissible current I
0
in A
2.5 21
4 28
6 36
10 50
16 66
*) Fixed or static cable installation
The data on the current-carrying capacity for single-core cables in the following table
are based on IEC 60364-5-52, Table B52.12, F/5. The maximum permissible ambient
temperature is 40 ° C.
Table 8- 8 Current-carrying capacity for single-core cables
Cross-section for power conductors in mm
2
Maximum permissible current I
0
in A
35 123
50 154