Additional Data For Calculating The Rise Time And The Peak Line-To-Line Voltage; Additional Note For Sine Filters - ABB ACS880-07 Hardware Manual

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
below and multiply it by the nominal supply voltage (U
•
Voltage rise time: Read the relative values Û
diagram below. Multiply the values by the nominal supply voltage (U
into 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
Note: Û and du/dt values are approximately 20% higher during resistor braking.
LL

Additional note for sine filters

A sine filter also protects the motor insulation system. Therefore, du/dt filter can be
replaced with a sine filter. The peak phase-to-phase voltage with a sine filter is
approximately 1.5 · U
Sine filter is available as an option (+E206).
/(du/dt).
LL
A
Û /U
LL N
du/dt
------------ - (1/μs)
U N
200 300
l (m)
.
N
Guidelines for planning the electrical installation 83
/U value from the appropriate diagram
LL N
).
N
/U and (du/dt)/U
LL N
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
from the appropriate
N
) and substitute
N
B
Û /U
LL N
200 300
l (m)