Omron MX2 Series User Manual page 296

6 Vector Control and Applied Functions
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.
• 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 6-55.
• 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.
• At frequency matching restart, the control mode may detect an overvoltage at high rotation
speeds of 120 Hz or higher, or at low rotation speeds under a low inductive voltage.
If an overcurrent is detected, instead of using frequency matching restart, use an external
brake or DC injection braking to stop the motor before restarting.
6 - 54
Maximum current of PM motor > Approx. 300% of rated output current of inverter
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)