Siemens Sinamics PM250 - Connection Overview; Length of Motor Cable

Connection
5.1 Line and motor connection
PM250 Power Module
34 Hardware Installation Manual, 01/2016, A5E36265179B-AA
5.1.3
Connection overview
Note
Line filter
The inverters are available with or without integrated line filter (Class A). There are external
filters (Class B) for increased EMC requirements for frame size FSC.
See Line filter
(Page
71)
5.1.4
Length of 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 (Page 58) 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.
Table 5- 1 Permissible motor cable length in m
Inverter with integrated filter and shielded cable
Inverter without filter, no EMC
category
First environment /
second environ-
ment,
EMC Category C2
Second environ-
ment, EMC category
C3
No EMC category
Shielded cable
Unshielded
cable
25
25
50
50
100
When using the inverter in the first environment, carefully observe the information in Section
Electromagnetic compatibility of the inverter (Page 63)