Symbols; Sizing; Derating; Temperature Derating - ABB ACS800-04 Hardware Manual

Symbols

Nominal ratings
I continuous rms output current. No overload capability at 40 °C.
cont.max
I maximum output current. Available for 10 s at start, otherwise as long as allowed by drive
max
temperature.
Typical ratings:
No-overload use
P typical motor power. The power ratings apply to most IEC 34 motors at the nominal voltage,
cont.max
230 V, 400 V, 500 V or 690 V.
Light-overload use (10% overload capability)
I continuous rms current. 10% overload is allowed for one minute every 5 minutes.
2N
P typical motor power. The power ratings apply to most IEC 34 motors at the nominal voltage,
N
230 V, 400 V, 500 V or 690 V.
Heavy-duty use (50% overload capability)
I continuous rms current. 50% overload is allowed for one minute every 5 minutes.
2hd
P typical motor power. The power ratings apply to most IEC 34 motors at the nominal voltage,
hd
230 V, 400 V, 500 V or 690 V.

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
value is greatest). If the limit is exceeded, motor torque and current are automatically restricted. The
function protects the input bridge of the drive against overload. If the condition exists for 5 minutes, the
limit is set to P
cont.max
Note 2: The ratings apply at ambient temperature of 40 °C (104 °F). In lower temperatures the ratings
are higher (except I
Note 3: Use the DriveSize PC tool for a more accurate dimensioning if the ambient temperature is
below 40 °C (104 °F) or the drive is loaded cyclically.

Derating

The load capacity (current and power) decreases if the installation site altitude exceeds 1000 metres
(3281 ft), or if the ambient temperature exceeds 40 °C (104 °F).
Note: If the ingoing cooling air temperature of the drive module is max. 40 °C (104 °F), no derating of
the drive output current is needed despite the cabinet temperature rising over 40 °C (104 °F).

Temperature derating

In the temperature range of +40 °C (+104 °F) to +50 °C (+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

At altitudes from 1000 to 4000 m (3281 to 13123 ft) above sea level, the derating is 1% for every 100 m
(328 ft). For a more accurate derating, use the DriveSize PC tool. See
metres (6562 feet) on page 52.
.
).
max
, 1.1 · P
hd
, 0.90 · I or 0.90 · I
2N 2hd cont.max
Installation sites above 2000
85
or P (whichever
N cont.max
%
· 10 °C =
°C
.
Technical data