Project Planning
1
6
10
Name: Basis
KEB COMBIVERT F5
04.05.04
Chapter
Section
Page
Date
©
KEB Antriebstechnik, 2002
All Rights reserved
10.1.3 Cable 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 from the DIN VDE
0298 Part 4. The values apply approximately and only for the intended operation. In
border cases always proceed in accordance with the above standard. The following
table shows the current-carrying capacity of 3- and/or 5-wire PVC cables (i.e. 2 and/or
3 loaded wires) in dependence on the ambient temperature. The current is to be laid
out to the input current of the frequency inverter.
Standard
Alternatively 30°C 40°C 45°C 50°C
0,5 mm²
-
7
6
6
5
0,75 mm²
-
12
10
10
9
1 mm²
-
15
13
13
11
1,5 mm²
-
18
16
15
13
2,5 mm²
-
26
23
22
18
4 mm² 2 x 1,5 mm²
34
30
29
24
6 mm² 2 x 2,5 mm²
44
38
37
31
10 mm²
2 x 4 mm²
61
53
51
43
16 mm²
2 x 6 mm²
82
71
69
58
25 mm²
2 x 10 mm² 108
94
91
77
35 mm²
2 x 16 mm² 135
117
113
96
50 mm²
2 x 16 mm² 168
146
141
119
70 mm²
2 x 25 mm² 207
180
174
147
95 mm²
2 x 35 mm² 250
218
210
178
120 mm²
2 x 50 mm² 292
254
245
207
150 mm²
2 x 50 mm² 330
287
277
234
185 mm²
2 x 70 mm² 394
343
331
280
240 mm²
2 x 95 mm² 450
392
378
320
300 mm²
2 x 95 mm² 507
441
426
360
400 mm² 2 x 150 mm² 661
575
555
469
500 mm² 2 x 185 mm² 774
673
650
550
Current in [A] at
Cross section of feed cable
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 the case of long lines (>30m) still maximum torque is required at the motor shaft,
the cable should be dimensioned 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 utilizing the power reserves of the inverter.
