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Siemens D 21.4 · 2017
Tools and configuration
Configuration notes
Power units
13
■
Configuration
(continued)
Long motor cables
Using pulse width modulation, the Power Modules or Motor Mod-
ules generate an AC voltage to feed the connected motor from
the DC voltage of the DC link. Capacitive leakage currents are
generated in clocked operation and these limit the permissible
length of the motor cable. The maximum permissible motor ca-
ble length is specified for each Power Module or Motor Module
in the component description.
Motor reactors limit the rate of rise and magnitude of the capac-
itive leakage currents, thereby allowing longer motor cables to
be used. The motor reactor and motor cable capacitance form
an oscillating circuit which must not be stimulated by the pulse
pattern of the output voltage. The resonant frequency of this os-
cillating circuit must therefore be significantly higher than the
pulse frequency. The longer the motor cable, the higher the ca-
ble capacitance and the lower the resonant frequency. To pro-
vide a sufficient safety margin between this resonant frequency
and the pulse frequency, the maximum possible motor cable
length is limited, even when several motor reactors are con-
nected in series. The maximum cable lengths in combination
with motor reactors are specified in the technical specifications
for the motor reactors.
Where a longer motor cable is required, a higher rating power
unit must be selected or the permissible continuous output cur-
rent
I
continuous
must be reduced in relation to the rated output
current
I
rated
.
The permissible cable length for an unshielded motor cable is
150 % of the length for a shielded motor cable.
Motor reactors can be used for frame sizes FSA to FSC to allow
longer motor cables to be used. Sine-wave filters are recom-
mended for frame sizes FSD to FSF.
The maximum cable lengths are shorter in order to comply with
EMC compatibility according to EN 61800-3.
See section
EMC notes.
Rated output
current
I
rated
Length of the MOTION-CONNECT motor cable (shielded)
> 50 … 100 m (164 … 328 ft)
> 100 … 150 m (328 … 492 ft)
> 150 … 200 m (492 … 656 ft)
> 200 m (656 ft)
Motor Module booksize format
3 A/5 A
Use Motor Module 9 A
Use Motor Module 9 A
Not permissible
Not permissible
9 A
Use Motor Module 18 A
Use Motor Module 18 A
Not permissible
Not permissible
18 A
Use Motor Module 30 A or
I
max
≤
1.5 ×
I
rated
I
continuous
≤
0.95 ×
I
rated
Use Motor Module 30 A
Not permissible
Not permissible
30 A
Always permissible
I
max
≤
1.35 ×
I
rated
I
continuous
≤
0.9 ×
I
rated
I
max
≤
1.1 ×
I
rated
I
continuous
≤
0.85 ×
I
rated
Not permissible
45 A/60 A
Always permissible
I
max
≤
1.75 ×
I
rated
I
continuous
≤
0.9 ×
I
rated
I
max
≤
1.5 ×
I
rated
I
continuous
≤
0.85 ×
I
rated
Not permissible
85 A/132 A
Always permissible
I
max
≤
1.35 ×
I
rated
I
continuous
≤
0.95 ×
I
rated
I
max
≤
1.1 ×
I
rated
I
continuous
≤
0.9 ×
I
rated
Not permissible
200 A
Always permissible
I
max
≤
1.25 ×
I
rated
I
continuous
≤
0.95 ×
I
rated
I
max
≤
1.1 ×
I
rated
I
continuous
≤
0.9 ×
I
rated
Not permissible
PM240-2 Power Module
1.3 A
1.7 A
2.2 A
3.1 A
4.1 A
Not permissible
Not permissible
Not permissible
Not permissible
5.9 A
7.7 A
I
max
≤
1.1 ×
I
rated
I
continuous
≤
0.6 ×
I
rated
Not permissible
Not permissible
Not permissible
10.2 A
I
max
≤
1.2 ×
I
rated
I
continuous
≤
0.7 ×
I
rated
Not permissible
Not permissible
Not permissible
18 A
I
max
≤
1.2 ×
I
rated
I
continuous
≤
0.7 ×
I
rated
I
max
≤
0.7 ×
I
rated
I
continuous
≤
0.45 ×
I
rated
Not permissible
Not permissible
25 A
32 A
I
max
≤
1.5 ×
I
rated
I
continuous
≤
0.9 ×
I
rated
I
max
≤
1.3 ×
I
rated
I
continuous
≤
0.8 ×
I
rated
Not permissible
Not permissible
38 A
45 A
60 A
Always permissible
Always permissible
Always permissible
Not permissible
75 A
90 A
Always permissible
Always permissible
Always permissible
Not permissible
110 A
145 A
178 A
Always permissible
Always permissible
Always permissible
Not permissible
from 145 A: 300 m (984 ft)
© Siemens AG 2017