ABB ACS580-07-0495A-4 - Selecting the Power Cables

Guidelines for planning the electrical installation 53
Additional data for calculating the rise time and the peak line-to-line voltage
If you need to calculate the actual peak voltage and voltage rise time considering the
actual cable length, proceed as follows:
• Peak line-to line voltage: Read the relative Û
LL
/U
N
value from the appropriate diagram
below and multiply it by the nominal supply voltage (U
N
).
• Voltage rise time: Read the relative values Û
LL
/U
N
and (du/dt)/U
N
from the appropriate
diagram below. Multiply the values by the nominal supply voltage (U
N
) and substitute
into equation t = 0.8 · Û
LL
/(du/dt).
Additional note for common mode filters
The drive is equipped with a common mode filter as standard.
Selecting the power cables
 General rules
Select the input power and motor cables according to local regulations:
• Select a cable capable of carrying the drive nominal current. See section Ratings
(page 117) for the rated currents.
• Select a cable rated for at least 70 °C maximum permissible temperature of conductor
in continuous use.
• Make sure that the inductance and impedance of the PE conductor/cable (grounding
wire) is rated according to permissible touch voltage appearing under fault conditions
(so that the fault point voltage will not rise excessively when a ground fault occurs).
• 600 V AC cable is accepted for up to 500 V AC.
A Drive with du/dt filter
B Drive without du/dt filter
I Motor cable length
Û
LL
/U
N
Relative peak line-to-line voltage
(du/dt)/U
N
Relative du/dt value
Note: Û
LL
and du/dt values are approximately 20% higher with resistor braking.
Û
LL
/U
N
l (m)
du/dt
U
N
-------------(1/s)
1.0
2.0
5.0
4.0
3.0
1.5
2.5
3.5
4.5
100 200 300
100 200 300
0.0
0.5
1.0
1.5
2.0
2.5
3.0
l (m)
du/dt
U
N
-------------(1/s)
Û
LL
/U
N
5.5
A
B