Siemens SINAMICS PM240-2 - Requirements for the protective conductor

Connecting-up
5.2 Connecting the line and motor cable at the inverter
Power Module PM240-2
52 Hardware Installation Manual, 01/2017, A5E33294624B AE
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.
Pulse frequencies (Page 65).
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.
EMC-compliant installation of a machine or system (Page 23)
Carefully observe the following section for operation in the first environment:
Electromagnetic compatibility of variable-speed drives (Page 96)
Table 5- 1 Permissible lengths of motor connecting cables, inverter FSA … FSC
EMC category
Second Environment, C2
No EMC category
Inverter
with internal
C2 filter
with external
C2 filter
with external
C1 filter,
with output
reactor
without filter,
without
output reac-
tor
without filter,
with output reactor
Cable
Shielded
Shielded
Shielded
Shield-
ed/unshield
ed
Shielded
Unshielded
200 V
50 m
50 m
---
150 m
150 m
225 m
400 V
50 m
1)
50 m
2)
150 m
3)
150 m
150 m
225 m
1)
For a low-capacitance motor cable: FSB 100 m, FSC 150 m
2)
For a low-capacitance motor cable: FSA 150 m, FSB 100 m, FSC 100 m
3)
150 m for voltages in the range 380 V … 415 V,
100 m for voltages in the range 440 V … 480 V
Table 5- 2 Permissible cable lengths for the motor connection, FSD … FSE
EMC category
Second Envi-
ronment, C2
No EMC category
Inverter
with internal
C2 filter
with or without filter, with or
without output reactor
without filter, with two output
reactors in series
Cable
Shielded
Shielded
Unshielded
Shielded
Unshielded
200 V
---
200 m
300 m
350 m
525 m
400 V
150 m
200 m
300 m
350 m
525 m
690 V
100 m
200 m
300 m
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