KEB COMBIVERT F5-A, Applications Manual, Page: 495 / 552

General design
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 9.1 - 7
9
9.1.3 Cables and fuses
By means of this section you can check whether you can still optimize your machine with regard to the material
usage. The specifications are derived for the DIN VDE 0298 Part 4. The values apply approximately and only
for the intended operation. In marginal cases it must be always proceed according to the standard described
obove.
The following table shows the current capability of 3 and/or 5 core PVC cables (i.e. 2 and/or 3 loaded cores)
in dependence with the ambient temperature. The current is to be laid out to the input current of the frequency
inverter.
Cross section of the allocation Current in A at
standard alternative 30°C 40°C 45°C 50°C
0.5 mm
2
– 7 6 6 5
0.75 mm
2
– 12 10 10 9
1 mm
2
– 15 13 13 11
1.5 mm
2
– 18 16 15 13
2.5 mm
2
– 26 23 22 18
4 mm
2
2 x 1.5 mm
2
34 30 29 24
6 mm 2 2 x 2.5 mm 2 44 38 37 31
10 mm 2 2 x 4 mm 2 61 53 51 43
16 mm 2 2 x 6 mm 2 82 71 69 58
25 mm 2 2 x 10 mm 2 108 94 91 77
35 mm 2 2 x 16 mm 2 135 117 113 96
50 mm 2 2 x 16 mm 2 168 146 141 119
70 mm
2
2 x 25 mm
2
207 180 174 147
95 mm
2
2 x 35 mm
2
250 218 210 178
120 mm
2
2 x 50 mm
2
292 254 245 207
150 mm
2
2 x 50 mm
2
330 287 277 234
185 mm
2
2 x 70 mm
2
394 343 331 280
240 mm
2
2 x 95 mm
2
450 392 378 320
300 mm
2
2 x 95 mm
2
507 441 426 360
400 mm 2 2 x 150 mm 2 661 575 555 469
500 mm 2 2 x 185 mm 2 774 673 650 550
The use of special cables or the way of laying the cables allows even higher currents (see DIN VDE 0298 Part
4). The motor cable must correspond to the cross-section of the mains cable.
If in case of long lines (>30m) still maximum torque is required at the motor shaft, the cable should be dimensi-
oned for the next larger cross-section in order to reduce line resistances.
Mains fuses are to be designed for the rated input current of the inverter. The current/time-characteristic of the
fuse must be slow-acting in order to avoid premature tripping when the power reserves of the inverter are used.