Configuring The Cable Length - Siemens SINAMICS S120 Manual

6.7.1

Configuring the cable length

To implement a longer motor cable, you can
● select a higher rating Motor Module or
● reduce the permissible continuous output current I
current I
The configuring data for booksize format Motor Modules are given in the following table:
Table 6- 5
Motor Module
Rated
output current I
3 A / 5 A
9 A
18 A
24 A
30 A
45 A / 60 A
It is not permissible to use shielded motor cables that are longer than 200 m.
When using a motor holding brake, the maximum motor cable length is 100 m. Voltage drops
may occur as a function of the motor cable length, motor holding brake current and cross-
section of the motor holding brake cables. Additional information on connection of the motor
holding brake can be found in Chapter "Options for the 24 V supply (Page 120)".
The permissible cable length for an unshielded motor cable is 150 % of the length for a
shielded motor cable.
Motor reactors can also be installed in order to permit the use of longer motor cables in the
VECTOR and U/f control types.
Power Units in Booksize C/D-Type Format
Manual, 12/2018, 6SL3097-5AC20-0BP0
.
rated
Permissible cable lengths for shielded motor cables
Length of motor cable (shielded)
> 50 ... 100 m
N
Use 9 A
Motor Module
Use 18 A
Motor Module
Use 30 A
Motor Module
or
I ≤ 1.5 × I
max
I ≤ 0.95 × I
continuous
Use 30 A
Motor Module
or
I ≤ 1.5 × I
max
I ≤ 0.95 × I
continuous
Always permitted
Always permitted
continuous
> 100 ... 150 m
Use 9 A
Motor Module
Use 18 A
Motor Module
Use 30 A
Motor Module
rated
rated
Use 30 A
Motor Module
rated
rated
I ≤ 1.35 × I
max
I ≤ 0.9 × I
continuous
I ≤ 1.75 × I
max
I ≤ 0.9 × I
continuous
Cabinet design
6.7 Connection system
in relation to the rated output
> 150 ... 200 m
Not permissible
Not permissible
Not permissible
Not permissible
I ≤ 1.1 × I
rated max rated
I ≤ 0.85 × I
rated continuous
I ≤ 1.5 × I
rated max rated
I ≤ 0.85 × I
rated continuous
rated
rated
115