DC−bus operation
Basic dimensioning
Cables
7
359
EDS94SPP101 EN 10.2
With different motor cable lengths, per axis at least 25 % of the longest cable must be
considered when calculating the total motor cable length.
Example: 1 Motor cable length l
mot
[m]
Axis Actual
value
min. 25 % of the longest cable To be considered
16
0.25 * 20 = 5
6
2 ... 4 3 * 10 3 * 10
5 20 20
Total 56 max. permissible for 5 axes: < 60 56
EMC class C2 will be complied with.
Example 2 Motor cable length l
mot
[m]
Axis Actual
value
min. 25 % of the longest cable To be considered
1 ... 4 4 * 5 0.25 * 40 = 10 4 * 10
5 40 40
Total 60 max. permissible for 5 axes: < 60 80
EMC class C2 will not be complied with.
Example: 3 Motor cable length l
mot
[m]
Axis Actual
value
min. 25 % of the longest cable To be considered
1 ... 3 3 * 100
0.25 * 100 = 25
3 * 100
4 50 50
5 ... 10 6 * 15 6 * 25
Total 410 max. permissible for 10 axes: < 500 500
EMC class C2 will be complied with.
Example: 4 Motor cable length l
mot
[m]
Axis Actual
value
min. 25 % of the longest cable To be considered
1 ... 4 4 * 100
0.25 * 100 = 25
4 * 100
5 ... 10 6 * 15 6 * 25
Total 490 max. permissible for 10 axes: < 500 550
EMC class C2 will not be complied with.
7.5.9 Cables
Select the cable cross−sections for the currents resulting from power P
DC100%
. Please
observe the standards and regulations applicable for the particular location and
application.
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