Transport, Installation and Connection
74 BA8230
Cross-section Resistance R
50
Inductive reactive resistance
[mm²]
[Ω/km] [Ω/km]
95 0.216 0.0754
120 0.171 0.0733
150 0.139 0.0733
185 0.110 0.0725
Table 25: Operating values for PVC insulated cable at 50 °C cable temperature.
To compensate for internal voltage drops 8230 frequency inverter units can simulate
the output voltage in an over-modular manner. The voltage drop across the motor
cable however cannot be compensated without direct measurement at the motor
connection. However the motor current consumed increases almost proportionally
through a reduced motor voltage at the same torque and increases the motor losses
for a squared reduction in motor trip torque and a reduction in motor flux.
If the values for the voltage drop are exceeded, 3-phase asynchronous motors with
U
Motor
< U
Mains
are to be used. If standard 3-phase motors are used, a reduction in the
type point can be made to determine the revised rating point.
Example: 50 Hz / 400 V changed to 47.5 Hz / 380 V
The level of interference on the mains side which is associated with the power is
increased through longer motor cables. A mains filter is recommended if sensitive
consumers are operated on the same mains supply and motor cable lengths
exceed 50 m.
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