Symbols; Sizing; Derating - ABB ACS350 User Manual

Symbols

Input
I continuous rms input current (for dimensioning cables and fuses)
1N
Output
I continuous rms current. 50% overload is allowed for one minute every ten minutes.
2N
I maximum (50% overload) current allowed for one minute every ten minutes
2,1min/10min
I maximum output current. Available for two seconds at start, otherwise as long as
2max
allowed by the drive temperature.
P typical motor power. The kilowatt ratings apply to most IEC 4-pole motors. The
N
horsepower ratings apply to most NEMA 4-pole motors.

Sizing

The current ratings are the same regardless of the supply voltage within one voltage range. To achieve
the rated motor power given in the table, the rated current of the drive must be higher than or equal to
the rated motor current.
Note 1: The maximum allowed motor shaft power is limited to 1.5 · P
torque and current are automatically restricted. The function protects the input bridge of the drive
against overload.
Note 2: The ratings apply at ambient temperature of 40°C (104°F).

Derating

The load capacity decreases if the installation site ambient temperature exceeds 40°C (104°F) or if the
altitude exceeds 1000 meters (3300 ft).
Temperature derating
In the temperature range +40°C...+50°C (+104°F...+122°F), the rated output current is decreased by
1% for every additional 1°C (1.8°F). The output current is calculated by multiplying the current given in
the rating table by the derating factor.
Example If the ambient temperature is 50°C (+122°F), the derating factor is 100% - 1
90% or 0.90. The output current is then 0.90 · I
Altitude derating
In altitudes 1000...2000 m (3300...6600 ft) above sea level, the derating is 1% for every 100 m (330 ft).
Switching frequency derating
Derate according to the switching frequency used (see parameter 2606) as follows:
Switching
frequency
4 kHz No derating
8 kHz Derate I
12 kHz Derate I
16 kHz Derate I
Ensure that parameter
the drive's internal temperature is too high. See parameter
2N
U = 200...240 V
N
to 90%.
2N
to 80%.
2N
to 75%.
2N
2607 SWITCH FREQ CTRL = 1 (ON), which reduces the switching frequency if
. If the limit is exceeded, motor
N
.
Drive voltage rating
U
N
No derating
Derate I to 75% for R0 or to 80% for
2N
R1...R4.
Derate I to 50% for R0 or to 65% for
2N
R1...R4 and derate maximum ambient
temperature to 30°C (86°F).
Derate I to 50% and derate maximum
2N
ambient temperature to 30°C (86°F).
2607 for details.
291
%
· 10°C =
°C
= 380...480 V
Technical data