ABB ACS880-07XT Series - Rise Time and Peak Voltage Data

62 Guidelines for planning the electrical installation
Additional data for calculating the rise time and the peak line-to-line voltage
The diagrams below show the relative peak line-to-line voltage and rate of change of
voltage as a function of the motor cable length with and without a du/dt filter in use.
To calculate the actual peak voltage for a certain cable length read the relative Û
LL
/U
N
value from the appropriate diagram and multiply it by the nominal supply voltage (U
N
).
To calculate the actual voltage rise time for a certain cable length read the relative values
Û
LL
/U
N
and (du/dt)/U
N
from the appropriate diagram. Multiply the values by the nominal
supply voltage (U
N
) and substitute into equation t = 0.8 · Û
LL
/(du/dt).
Additional note for sine filters
Sine filters protect the motor insulation system. Therefore, the 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
N
.
Additional note for common mode filters
Common mode filter is included in the standard drive module delivery.
Drive with du/dt filter 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: ÛLL and du/dt values are approximately 20% higher with resistor braking.
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
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
5.5