ABB ACH480 - Surrounding air temperature derating; Altitude derating

Altitude derating: The derating factor for 5500 ft is
Surrounding air temperature derating: Derating is not necessary at 95 °F
surrounding air temperature.
To see if the derated output current of a drive is sufficient for the application,
multiply the drive output current for light-duty use ( I
Ld
) by all the applicable derating
factors. For example, drive type ACH480-04-21A-4 has an output current of 21 A
at 480 V.
Switching frequency derating:The derating factor for this drive type is 0.67 at
8 kHz. Calculate the derated drive output current:
In this example, the derated output current is sufficient, because it is higher than
the required current.
￭
Surrounding air temperature derating
DeratingTemperatureFrame
No deratingLess than 50 °C
(122 °F)
All
Output current decreases by 1% for each additional 1 °C
(1.8 F).
50 … 60 °C
(122 … 140 °F)
R1…R3
Output current decreases by 1% for each additional 1 °C
(1.8 F) on:
IEC types
50 … 60 °C
(122 … 140 °F)
R4
• ACH480-04-033A-4
• ACH480-04-046A-4
UL (NEC) types
• ACH480-04-027A-4
Output current decreases by 2% for each additional 1 °C
(1.8 F) on:
IEC types
• ACH480-04-039A-4
• ACH480-04-050A-4
UL (NEC) types
• ACH480-04-034A-4
• ACH480-04-042A-4
￭
Altitude derating
230 V drives: At altitudes 1000 … 2000 m (3281 … 6562 ft) above sea level, the
derating is 1% for each added 100 m (328 ft) above 1000 m (3281 ft).
Technical data 137