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VFD-F Series
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED
3-16
3.7 Motor Operation Precautions
1. When using the AC drive to operate a standard 3-phase induction motor, notice that the
energy loss is greater than for an inverter duty motor.
2. Avoid running a standard induction motor at low speed. Under these conditions, the
motor temperature may rise above the motor rating due to limited airflow produced by
the motor’s fan.
3. When the standard motor operates at low speed, the output load must be decreased.
4. If 100% output torque is desired at low speed, it may be necessary to use a special
“inverter-duty” rated motor.