ABB ACS880-11 - Additional Data for Calculating the Rise Time and the Peak Line-To-Line Voltage

Requirement forNominal AC supply
voltage
ABB du/dt and common mode filters, insu-
lated N-end motor bearings
Motor insulation sys-
tem
100 kW < P
n
< 350 kW
or
IEC 315 < frame size
< IEC 400
P
n
< 100 kW or frame
size < IEC 315
134 hp < P
n
< 469 hp
or
NEMA 500 < frame
size < NEMA 580
P
n
< 134 hp or frame
size < NEMA 500
+ N or CMF+ N or CMF
Standard: Û
LL
=
1300 V
U
n
≤ 420 V
+ N + du/dt + CMF+ du/dt + (N or CMF)Standard: Û
LL
=
1300 V
420 V < U
n
< 500 V
or
+ N or CMF+ N or CMF
Reinforced: Û
LL
=
1600 V, 0.2 micro-
second rise time
+ N + du/dt + CMF+ du/dt + (N or CMF)Reinforced: Û
LL
=
1600 V
500 V < U
n
≤ 600 V
or
+ N + CMF+ N or CMF
Reinforced: Û
LL
=
1800 V
+ N + du/dt + CMF+ N + du/dtReinforced: Û
LL
=
1800 V
600 V < U
n
≤ 690 V
+ N + CMF+ N + CMF
Reinforced: Û
LL
=
2000 V, 0.3 micro-
second rise time
1)
1)
If the intermediate DC circuit voltage of the drive is increased from the nominal level due to long term resistor
braking cycles, check with the motor manufacturer if additional output filters are needed.
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. 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 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 diagram
below. Multiply the values by the nominal supply voltage (U
n
) and substitute into
equation t = 0.8 · Û
LL
/(du/dt).
Guidelines for planning the electrical installation 61