Additional Data For Calculating The Rise Time And The Peak Line-To-Line Voltage - ABB ACS880-17 Hardware Manual

74 Guidelines for planning the electrical installation

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
multiply it by the nominal supply voltage (U
•
Voltage rise time: Read the relative values Û
below. Multiply the values by the nominal supply voltage (U
equation t = 0.8 · Û
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
Additional note for sine filters (option +E206)
Sine filters protect the motor insulation system. Therefore, du/dt filter can be replaced with
a sine filter. The peak phase-to-phase voltage with the sine filter is approximately 1.5 · U
/(du/dt).
LL
A
Û /U
LL N
du/dt
------------ - (1/s)
U N
200 300
l (m)
/U value from the diagram below and
LL N
).
N
/U and (du/dt)/U
LL N
) and substitute into
N
B
5.5
5.0
du/dt
------------ - (1/s)
U
4.5
N
4.0
3.5
3.0
2.5
2.0
1.5
1.0
100
from the diagram
N
Û /U
LL N
200 300
l (m)
.
N