Lenze E82xVxxxKxxxxx - Manual (Page 112)

Electrical installation
Notes on project planning
Motor cable
6
l
112 EDS82EV903 EN 3.0
6.2.9 Motor cable
Specification
ƒ The used motor cables must
– comply with the requirements that apply to the site of installation (e.g.
EN 60204−1, UL),
– comply with the following voltage data: EN 0.6/1 kV, UL 600 V.
ƒ For shielded motor cables only use cables with braid made of tinned or nickel−plated
copper. Shields made of steel braid are not suitable.
– The overlap rate of the braid must be at least 70 % with an overlap angle of 90°.
ƒ Use low−capacitance motor cables:
Power class Capacitance per unit length
Core/core Core/shield
0.25 ... 2.2 kW Up to 1.5 mm 2 £75 pF/m £ 150 pF/m
3 ... 11 kW From 2.5 mm 2 £100 pF/m £ 150 pF/m
15 ... 30 kW £ 140 pF/m £ 230 pF/m
45 ... 55 kW £ 190 pF/m £ 320 pF/m
75 ... 90 kW £ 250 pF/m £ 410 pF/m
Cable length
ƒ The motor cable must be as short as possible for having a positive effect on the drive
behaviour.
ƒ For group drives (several motors connected to one drive controller) the resulting
cable length l
res
is the crucial factor:
I
res
[m] + (l
1
) l
2
) l
3
... ) l
i
) @ i
Ǹ l
x
Length of the individual motor cable
l
res
Resulting length of the motor cable
i Number of the individual motor cables
ƒ At rated mains voltage and a switching frequency of 8 kHz and without additional
output filters, the maximum permissible length of the motor cable is as follows:
– 50 m shielded
– 100 m unshielded
)
Note!
For compliance with EMC regulations, the permissible cable lengths must be
changed.