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Cable cross-section calculation
Notes on cable cross-section calculation and cable routing
Simplified formula for cable cross-section calculation
(for drives up to 2.5 A nominal current draw)
Note
: Observe permissible current output, see technical data.
A = cable cross-section
I = sum of the nominal currents of the drives
*L = simple cable length
** 30 % = = loading factor for drives greater than or equal to 2.5 A current draw
73 = factors, made up from 2.5 V max. permissible voltage drop and
electrical conductivity of copper
Troubleshooting
Power unit does not work
- Check mains power supply / mains voltage.
- Check on site mains fuse.
- Fuse faulty
possible overload
replace fuse
- Fuse still faulty
power unit faulty
replace power unit.
Drives running in the wrong direction
- Check connection terminal A1/A2 and replace if necessary.
- Reverse connection at the vent switch.
Vent switch with reverse function
- Reverse connection at the vent switch.
Windows do not open
- Vent switch incorrectly connected.
- Check mains power supply/mains voltage.
- A wind and rain detector is connected.
- A superior control is connected.
- Manual/automatic selector switch in the "automatic" position.
Cable length diagram
Cable length diagram to calculate the required cable cross-sections as a function of cable length and
the sum of the nominal currents of the drives.
Cable length diagram up to 8 amps
for drives with a current
draw < 2,5 A
Cable length diagram up to 8 amps
for drives with a current
draw ≥ 2,5 A
m (simple cable length)
Nominal drive current in amps
A [mm²] = (I [A] + loading factor in % where applicable**) x L* [m]
73
e)
d)
c)
b)
a)
0
1
Kabellängendiagramm bis 8 Ampere für Antriebe mit einer Stromaufnahme < 2,5 A
m
(e
in
fa
ch
e
Le
itu
ng
sl
än
ge
)
Nennstrom Antrieb in Ampere
a)
b)
c)
d)
e)
50
100
150
200
250
300
350
400
450
500
2
3
4
5
6
7
8
Kabellängendiagramm bis 8 Ampere für Antriebe mit einer Stromaufnahme
≥
2,5 A
a)
b)
c)
d)
e)
0
10
20
30
40
50
60
70
80
90
100
2,5 3 3,5
5
6
7
8
4 4,5
5,5
6,5
7,5
e) 6 mm²
d) 2 x 2,5 mm²
c) 4 mm²
b) 2,5 mm²
a) 1,5 mm²
6 mm²
2 x 2.5 mm²
4 mm²
2.5 mm²
1.5 mm²
m (simple cable length)
Nominal drive current in amps
simple cable length (L*)
Ventilation control panel iVent 8A
