Selecting The Power Cables; General Guidelines - ABB ACQ580-34 Hardware Manual

78 Guidelines for planning the electrical installation
3.0
2.5
2.0
1.5
1.0
0.5
0.0
100
A Drive with du/dt filter
B Drive without du/dt filter
I Motor cable length
Û /U Relative peak line-to-line voltage
LL N
(du/dt)/U Relative du/dt value
N
Note: Û and du/dt values are approximately 20% higher with resistor braking.
LL

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).
Important: For certain product types or option configurations higher temperature rating
may be required. See the technical data for details.
• 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
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.
A
Û
/U
LL n
d / d
u t
- -- - - -- - - - - - (1/ µs) -
U n
200 300
l (m)
79).
5.5
5.0
du/dt
-------------(1/ µs)
U n
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
100
B
Û
/U
LL n
200 300
l (m)