ABB ACH480 Series - Surrounding Air Temperature Derating; Altitude Derating; Switching Frequency Derating

￭ Surrounding air temperature derating
DeratingTemperatureFrame
No derating
Less than 50 °C
(122 °F)
All
Output current decreases by 1% for every additional 1 °C
(1.8 F).
50 … 60 °C
(122 … 140 °F)
R1…R3
Output current decreases by 1% for every 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 every 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
400/480 V drives: In altitudes 1000 … 4000 m (3281 … 13123 ft) above sea level, the
derating is 1% for every 100 m (328 ft). In addition:
• A maximum altitude of 4000 m (13123 ft) is permitted for these earthing systems:
TN-S, TT. A maximum altitude of 2000 m (6562 ft) is permitted for these earthing
systems: corner-grounded delta, IT (ungrounded).
• Above 2000 m (6562 ft), the maximum permitted voltage for the relay output RO1
decreases. At 4000 m (13123 ft), it is 30 V.
• Above 2000 m (6562 ft), the maximum permitted potential difference between the
adjacent relays of the BREL-01 relay extension module (option +L511) decreases.
At 4000 m (13123 ft), it is 30 V.
To calculate the derated output current, multiply the current in the ratings table with the
derating factor k, which for x meters or feet is:
￭ Switching frequency derating
Derating the drive output current is necessary when using high minimum switching
frequencies. If you change parameter 97.02 Minimum switching frequency, calculate
128 Technical data