Length Of The Motor Cable - Siemens SINAMICS G12 Hardware Installation Manual

5.2.2

Length of the motor cable

Always dimension the motor cable so that the ohmic losses are less than 5 % of the inverter
power rating.
The permissible length of the motor cable also depends on the quality of the motor cable and
the inverter pulse frequency. The values specified below are applicable for high quality cables,
such as CY100 or similar, and for the pulse frequencies set in the factory.
If you set other pulse frequencies, then you must ensure that the EMC category is complied
with on the plant or system side.
EMC-compliant wiring is required in order that the inverter complies with the EMC category
listed in the following table.
Carefully observe the following section for operation in the first environment:
Table 5-1
EMC category
Inverter
Cable
200 V
400 V
For a low-capacitance motor cable: FSB 100 m, FSC 150 m
1)
For a low-capacitance motor cable: FSA 150 m, FSB 100 m, FSC 100 m
2)
150 m for voltages in the range 380 V ... 415 V,
3)
100 m for voltages in the range 440 V ... 480 V
Table 5-2
EMC category
Inverter
Cable
200 V
400 V
690 V
Power Module PM240-2
Hardware Installation Manual, 08/2017, A5E33294624B AG
Pulse frequencies (Page 73).
EMC-compliant installation of a machine or system (Page 26)
Electromagnetic compatibility of variable-speed drives (Page 111)
Permissible lengths of motor connecting cables, inverter FSA ... FSC
Second Environment, C2
with internal
C2 filter nal C2 filter
Shielded
50 m
50 m
1)
Permissible cable lengths for the motor connection, FSD ... FSE
Second Envi‐
ronment, C2
with internal
C2 filter
Shielded
---
150 m
100 m
5.2 Connecting the line and motor cable at the inverter
with exter‐ with exter‐
nal C1 filter,
with output
reactor
Shielded Shielded
50 m ---
50 m 150 m
2) 3)
with or without filter, with or with‐
out output reactor
Shielded Unshielded
200 m 300 m
200 m 300 m
200 m 300 m
No EMC category
without fil‐ without filter,
ter, without with output reactor
output reac‐
tor
Shielded/ Shielded
unshielded
150 m 150 m
150 m 150 m
No EMC category
without filter, with two output re‐
actors in series
Shielded
350 m
350 m
---
Connecting-up
Unshielded
225 m
225 m
Unshielded
525 m
525 m
---
59