400/480 V drives: At altitudes 1000 … 4000 m (3281 … 13123 ft) above sea level,
the derating is 1% for each added 100 m (328 ft) above 1000 m (3281 ft). In addition:
• A maximum altitude of 4000 m (13123 ft) is permitted for these grounding
systems: TN-S, TT. A maximum altitude of 2000 m (6562 ft) is permitted for
these grounding systems: corner-grounded delta, midpoint-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
the derated current. Multiply the drive output current with the applicable derating
factor from the table.
Derating is not necessary when changing parameter 97.01 Switching frequency
reference.
Frame R4: If the application is cyclic and the surrounding air temperature is
constantly more than 40 °C (104 °F), keep parameter 97.02 Minimum switching
frequency at its default value (1.5 kHz). Higher switching frequencies decrease the
product life time or the performance in the temperature range 40 … 60 °C
(104 … 140 °F).
Derating factorIEC type
ACH480-
04-…
12 kHz8 kHz< 4 kHz
1-phase
U
n
= 230 V
0.660.801.002A4-1
0.660.801.003A7-1
0.680.811.004A8-1
0.680.811.006A9-1
0.740.851.007A8-1
138 Technical data
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