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If the Motor Does Not Operate Properly<br />
The following causes are possible:<br />
•The motor does not operate when an external operation signal is input.<br />
The frequency reference is 0.00 Hz or a no speed is selected by the digital inputs. Check the input signals and<br />
the frequency reference settings.<br />
Also make sure to set the Baseblock signal. The inverter does not accept any input if it is base blocked.<br />
•The load is too heavy<br />
Check the motor current. If it is at the limit of the inverter rated current the load might be too high. Check the<br />
inverter size and the mechanical system. Check also if the brake is operating or not.<br />
If the Direction of the Motor Rotation is Reversed<br />
If the motor rotates in the wrong direction, the motor output wiring may be incorrect. When the Inverter operates<br />
in the forward direction, the forward direction of the motor will depend on the manufacturer and the<br />
motor type, so be sure to check the motor specification<br />
The direction of the motor rotation can be reversed by switching two wires among U, V, and W. If using an<br />
encoder, the polarity will also have to be switched. If the Inverter is operated in V/f mode also parameter b1-<br />
04 can be used to change the rotation direction.<br />
If the Motor Stalls or Acceleration is Slow<br />
•The torque limit has been reached.<br />
When a torque limit has been set in parameters L7-01 to L7-04, the output torque will be limited according<br />
these settings. Therefore the motor may not develop enough torque to accelerate or the acceleration time might<br />
be very long.<br />
•The stall prevention level during acceleration is too low.<br />
If the value set for L3-02 (Stall Prevention Level during Acceleration) is too low, the acceleration time will be<br />
increased. Check that the set value is suitable and that the load is not too large for the motor.<br />
•The stall prevention level during running is too low.<br />
If the value set for L3-06 (Stall Prevention Level during Running) is too low, the motor speed and torque will<br />
be limited. Check that the set value is suitable and that the load is not too large for the motor.<br />
•Auto-tuning has not been performed for vector control<br />
Vector control will not work properly if auto-tuning has not been performed. Perform auto-tuning, or set the<br />
motor parameters through calculations.<br />
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