Motor Application Precautions
9-5
9
Motor Application Precautions
Using the Inverter for an Existing Standard Motor
Observe the following precautions when using an Inverter for an existing standard motor.
Low Speed Ranges
If a standard cooled motor is used at low speed the cooling effects are diminished. If the motor is used in con-
stant torque applications in low speed area the motor may overheat. If full torque is required at low speed con-
tinuously an externally cooled motor must be used.
Installation Withstand Voltage
If the inverter is used with an input voltage of 440 V or higher and long motor cables, voltage spikes at the
motor terminals may occur which can damage the motor windings. Please ensure that the motor insulation
class is sufficient.
Noise
The noise generated in the motor depends on the carrier frequency. The higher the setting the less the gener-
ated noise is.
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