Design Guide | iC7 Series Air-cooled System Modules
Table 9: Minimum Distances from Motor Cables to Other Cables
Distance to other cables
[m (ft)]
Length of the shielded motor cable
[m (ft)]
0.3 (1.0)
≤ 50 (164)
1.0 (3.3)
≤ 150 (492)
1.
Before starting, make sure that none of the components of the AC drive is live. Read all safety precautions in this guide and
other documents available for this product.
2.
Make sure that the motor cables are sufficiently far from other cables.
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
).
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, the 590
A INU module is based on 3 parallel cables, and the 880 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 IM11: 4x(3x120+70) mm
2
, 150 m, 0.75 nF/m
→
CTOT = 4 x 150 m x 0.75 nF/m = 450
nF = CMAX
b.
Example where number of motor cables connected in parallel is higher than the default: 6x(3x120+70) mm
2
, 100 m, 0.75
nF/m
→
CTOT = 6 x 100 m x 0.75 nF/m = 450 nF = CMAX
c.
Example where motor cable capacitance is higher than the default: 4x(3x120+70) mm
2
, 130 m, 0.85 nF/m
→
CTOT = 4 x 130
m x 0.85 nF/m = 442 nF < CMAX
8.
The maximum cable length of the filters is also 150 m (492 ft).
9.
Only use symmetrical and shielded motor cables.
10.
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.
11.
Perform the cable insulation checks if necessary.
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