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Engineering Guide CDA3000
3 Selection of inverter module
3.3.5 87 Hz charac-
teristic /
Expanded
manipulating
range
The operating range with constant torque of a 400 V / 50 Hz motor in star
configuration can be expanded to 87 Hz in delta configuration.
Example: Motor 4 kW / 50 Hz in delta configuration
• Rated power 4 kW
• Nominal speed 1420 rpm
• Rated voltage 230 / 400 V
• Delta / star configuration
1. Reconfigure motor to delta configuration (230 V / delta)
2. Select inverter output
=
= 4 kW
.
1.73 = 6.9 kW
Selected inverter module: CDA34.017
Rated power 7.5 kW
Rated voltage 0 ... 400 V
Max. output frequency 0 ... 100 Hz
P
Inverter
P
Motor
3⋅≥
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