ABB ACS880-77CC, Hardware Manual

Page: 88 / 128

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Derating
The load capacity (current and power) decreases if the installation site altitude exceeds
1000 meters (3281 ft), or if the ambient temperature exceeds 45 °C (113 °F).
Ambient temperature derating
In the temperature range +45 °C (+113 °F) … +55 °C (+131 °F), the rated output current is
decreased by 2.5% 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 55 °C (+131 °F), the derating factor is
100% - 2.5 %/°C · 10 °C = 75% or 0.75. The output current is then 0.75 · I
gen
.
For converter output current derating based on coolant inlet temperature, see section
Temperature limits (page 121) .
Altitude derating
At altitudes above 1000 m (3281 ft) above sea level, the derating is 1% for every 100 m
(328 ft) on maximum continuous current. This can be compensated by reducing maximum
ambient air temperature by 1 °C (1.8 °F) for every 100 m (328 ft). Derating is allowed only
on maximum continuous current for grid and generator. If the installation site is located
higher than 2000 m (6562 ft) above sea level, contact your local ABB representative.
Type equivalence table
Basic module type (R9iLC)
Construction type
Converter type
ACS880-77CC-
Grid-side converter Generator-side converter
ACS880-104LC-… (+E205) ACS880-104LC-… (+E205) Generator-side converter
m Grid-side con-
verter LCL
U
N
= 690 V
0860A-7 0900A-7 2×(4×R9iLC + 4×R9iLC +
1×LCL)
6880A/5500A-7
3AXD10000011539
88 Technical data