100 200 300
0.0
0.5
1.0
1.5
2.0
2.5
3.0
/
--
-
-
(1/ µs)
U
n
-
-
-
u
----
d
-
t
-
d
l (m)
Û
LL
/U
n
A
Û
LL
/U
n
l (m)
du/dt
U
n
-------------(1/ µs)
1.0
2.0
5.0
4.0
3.0
1.5
2.5
3.5
4.5
100 200 300
5.5
B
Drive with du/dt filter
A
Drive without du/dt filter
B
Motor cable length
I
Relative peak line-to-line voltage
Û
LL
/U
n
Relative du/dt value(du/dt)/U
n
Note: Û
LL
and du/dt values are approximately 20% higher with resistor braking.
Additional note for sine filters
A sine filter also protects the motor insulation system. The peak phase-to-phase voltage
with a sine filter is approximately 1.5 · U
n
.
Selecting the power cables
￭ General guidelines
Select the input power and motor cables according to local regulations.
• Current: Select a cable capable of carrying the maximum load current and suitable for
the prospective short-circuit provided by the supply network. The method of installation
and ambient temperature affect the cable current carrying capacity. Obey local regulations
and laws.
• Temperature: For an IEC installation, select a cable rated for at least 70 °C (158 °F)
maximum permissible temperature of conductor in continuous use. For North America,
select a cable rated for at least 75 °C (167 °F).
• Voltage: 600 V AC cable is accepted for up to 500 V AC. 750 V AC cable is accepted
for up to 600 V AC. 1000 V AC cable is accepted for up to 690 V AC.
To comply with the EMC requirements of the CE mark, use one of the preferred cable types.
See Preferred power cable types (page 92).
Symmetrical shielded cable reduces electromagnetic emission of the whole drive system
as well as the stress on motor insulation, bearing currents and wear.
Metal conduit reduces electromagnetic emission of the whole drive system.
The protective conductor must always have an adequate conductivity.
Guidelines for planning the electrical installation 91
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