Carrier Frequency Selection
6-3
Inverters in Protection Class IP00 and IP20 / NEMA 1 and Normal Duty 2
In the Normal Duty 2 mode the maximum carrier frequency is decreased compared to the Normal Duty 1
mode but the short term overload capability is increased. No further increase of the carrier frequency is possi-
ble. Refer to Fig 6.2 for the overload capability of both modes and to page 5-47, Factory Settings that Change
with the Inverter Capacity (o2-04) for the carrier frequency default settings in Normal Duty 2
Fig 6.2 Normal Duty 1 and 2 Inverter Overload Detection Curve
Inverters in Protection Class IP54
The default carrier frequency setting is 5kHz for all Inverters in protection class IP54. If the carrier frequency
is set to a higher value than the factory setting, the overload capability is reduced as shown in Fig 6.3. For
IP54 Inverters the setting Heavy Duty 2 is not available.
Fig 6.3 Overload Capability depending on Carrier Frequency (IP54)
0.1
1
10
100
100 110 120 130 140 150 160 170 180 190 200
Overload Level [%]
Inverter Overload Detection Time [min]
Normal Duty 1 Normal Duty 2
120%
96%
72%
5 kHz
10 kHz
15 kHz
Overload Current for 1 Minute
Carrier Frequency
400V class 7.5kW to 18.5kW (IP54)
400V class 22 to 55kW (IP54)
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