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

Symbols

Nominal ratings
I Continuous RMS output current. No overloadability at 40 °C.
cont.max
I Maximum output current. Allowable for 10 seconds at start, otherwise as long as allowed
max
by drive temperature. Note: Maximum motor shaft power is 150% P
Typical ratings for no-overload use
P Typical motor power. The power ratings apply to most IEC 34 motors at nominal voltage
cont.max
(400, 500 or 690 V).
Typical ratings for light-overload use (10% overloadability)
I Continuous rms current. 10% overload is allowed for 1 minute every 5 minutes.
2N
P Typical motor power. The power ratings apply to most IEC 34 motors at nominal voltage
N
(400, 500 or 690 V).
Typical ratings for heavy-duty use (50% overloadability)
I Continuous rms current. 50% overload is allowed for 1 minute every 5 minutes.
2hd
P Typical motor power. The power ratings apply to most IEC 34 motors at nominal voltage
hd
(400, 500 or 690 V).

Derating

The load capacity (current and power) decreases if the installation site altitude exceeds 1000 metres
(3300 ft), or if the ambient temperature exceeds 40 °C (104 °F).

Temperature derating

In the temperature range +40 °C (+104 °F) to +50 °C (+122 °F) the rated output current is decreased
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
Note: I rating is not allowed above 40 °C (104 °F).
cont.max

Altitude derating

In altitudes from 1000 to 4000 m (3300 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.
or 0.90 · I .
2N 2hd
111
.
hd
%
· 10 °C =
°C
Technical data