Precautions for Correct Use
•
Check the maximum allowable current (limiting current beyond which demagnetization
occurs) for your PM motor.
The inverter could output approximately 300% of the rated output current of the inverter.
Select a PM motor as follows to prevent demagnetization.
When comparing each motor specification, note whether it is an effective value or a peak
value. The inverter’s rated current is an effective value.
Maximum current of PM motor > Approx. 300% of rated output current of inverter
•
In the PM motor mode, some of the inverter functions are unavailable. Unavailable parame-
ters are not displayed on the Digital Operator.
Refer to 6-8-2 Functional Limitations in PM Motor Mode on page 6-56.
•
The PM motor control mode is applied to one single motor. It is not possible to drive more
than one PM motor with a single inverter.
•
With an extremely large load, this control may not keep the PM motor in a synchronized
state.
As a guide, the motor-shaft conversion of the moment of load inertia shall be not more than
30 times as great as the moment of inertia of the PM motor.
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