Design Guide | iC7 Series Liquid-cooled System Modules
3. The motor cables must go across other cables at an angle of 90°.
4. If it is possible, do not put the motor cables in long parallel lines with other cables.
5. If the motor cables are in parallel with other cables, obey the minimum distances (see Table 14).
6. The distances are also valid between the motor cables and the signal cables of other systems.
7. The maximum length of shielded motor cables is 150 m (492 ft). If the used motor cables are longer, contact the vendor to
get more information. The motor cable length is based on the maximum number of cables for each frame. For example, 416
A INU module is based on 2 parallel cables, and 820 A INU module on 4 parallel cables. The default motor cable operating
capacitance is 0.75 nF/m. If some other cable type is used or the number of cables connected in parallel does not match with
recommendations, the maximum motor cable length must be derated so that the maximum total motor cable capacitance is
not exceeded.
a. Default maximum motor cable setup for Ix10L: 2x(3x120+70) mm
2
, 150 m, 0.75 nF/m → C
TOT
= 2 x 150 m x 0.75 nF/m = 225
nF = C
MAX
b. Example where number of motor cables connected in parallel is higher than the default: 3x(3x120+70) mm
2
, 100 m, 0.75
nF/m → C
TOT
= 3 x 100 m x 0.75 nF/m = 225 nF = C
MAX
c. Example where motor cable capacitance is higher than the default: 2x(3x120+70) mm
2
, 130 m, 0.85 nF/m → C
TOT
= 2 x 130
m x 0.85 nF/m = 221 nF < C
MAX
8. The minimum length of the motor cables without output filters is 5 m (16.4 ft).
9. See the maximum cable length of the filters in 7.13.1 dU/dt Filter and 7.13.2 Common-mode Filter.
10. Only use symmetrical and shielded motor cables.
11. Use symmetrical power cabling with power units connected in parallel. Each power unit must have the same number of cables
with an equal cross-section and equal length.
12. Perform the cable insulation checks if necessary.
Figure 62: Cabling Principle
Danfoss Drives Oy © 2024.03 AJ475942178716en-000101 / 172K2848A | 69
To Next Page
Loading...
Need help?
General
