Additional Data For Calculating The Rise Time And The Peak Line-To-Line Voltage; Additional Note For Sine Filters - ABB ACS880-37 Hardware Manual

80 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
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

Additional note for sine filters

A sine filter (option +E206) also protects the motor insulation system. The peak phase-to-
phase voltage with a sine filter is approximately 1.5 × U
/(du/dt).
LL
Û /U
LL N
du/dt
------------ - (1/s)
U
N
200 300
/U value from the diagram below and
LL N
).
N
/U and (du/dt)/U
LL N
N
l (m)
.
N
from the diagram
N
) and substitute into