ABB ACS880-07 - Additional Data for Calculating the Rise Time and the Peak Line-To-Line Voltage

Requirement forNominal AC supply
voltage
ABB d u /d t and common mode filters, insulated N-
end motor bearings
Motor insulation sys-
tem
1)
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 Û
LL
= 1300 V, 0.2 µs rise
time
U
n
≤ 420 V
+ N + d u /d t + CMF+ d u /d t + (N or CMF) Û
LL
= 1300 V420 V < U
n
< 500 V
+ N or CMF+ N or CMF Û
LL
= 1600 V, 0.2 µs rise
time
+ N + d u /d t + CMF+ d u /d t + (N or CMF) Û
LL
= 1600 V500 V < U
n
≤ 600 V
+ N + CMF+ N or CMF Û
LL
= 1800 V, 0.2 µs rise
time
+ N + d u /d t + CMF+ N + d u /d tÛ
LL
= 1800 V600 V < U
n
≤ 690 V
+ N + CMF+ N + CMF Û
LL
= 2000 V, 0.3 µs rise
time
1)
These are typical values. The network topology and grounding, drive type, cable type, cable length, and motor type
have an effect on the phase-to-phase and phase-to-ground voltages of the motor. For motor dimensioning and
selection, refer to IEC 60034-18-41, IEC 60034-18-42 and IEC/TC 60034-25. For more information, contact ABB.
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 estimate the 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 ( t
r
): Read the d u /d t value from the diagram below. Substitute
the Û
LL
(in kV) and d u /d t values into equation t
r
= 0.8 · Û
LL
/(d u /d t ).
98 Guidelines for planning the electrical installation