Sizing; Derating; Temperature Derating; Altitude Derating - ABB ACS800 Hardware Manual

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
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. If the installation site is higher than
2000 m (6600 ft) above sea level, please contact your local ABB distributor or office for further
information.

Mains cable fuses

Fuses for short-circuit protection of the mains cable are listed below. The fuses also
protect the adjoining equipment of the drive in case of a short-circuit inside the drive.
Check that the operating time of the fuse is below 0.5 seconds. The operating
time depends on the supply network impedance and the cross-sectional area,
material and length of the supply cable. In case the 0.5 seconds operating time is
exceeded with gG fuses, ultrarapid (aR) fuses will in most cases reduce the
operating time to an acceptable level. See also Planning the electrical installation:
Thermal overload and short-circuit
tables.
Note 1: In multicable installations, install only one fuse per phase (not one fuse per conductor).
Note 2: Larger fuses must not be used.
Note 3: Fuses from other manufacturers can be used if they meet the ratings.
.
cont.max
).
max
, 0.90 · I or 0.90 · I
2N 2hd
protection. For UL recognized fuses, see
, 1.1 · P or P (whichever
hd N cont.max
%
· 10 °C =
°C
.
cont.max
Technical data
77
US