8-21
Lengthen the acceleration time or reduce the load. Also consider increasing the
motor capacity.
H The motor only rotates in one direction.
·Reverse rotation-prohibit is selected.
If n006 for reverse rotation-prohibit selection is set to 1 (reverse run prohibited), the
Inverter will not accept reverse-rotation commands.
To use both forward and reverse rotation, set n05 to 0.
8-2-3 Motor Rotates in the Wrong Direction
·The output wiring of the motor is faulty.
WhentheU,V,andWterminalsoftheInverterareproperlyconnectedtotheU,Vand
Wterminalsofthemotor,themotorwilloperateinaforwarddirectionwhenaforward
rotation commandis executed.The forwarddirection dependson themanufacturer
and the motor type. Therefore, be sure to check the specifications.
Switching two wires among the U, V, and W will reverse the direction of rotation.
8-2-4 Motor Outputs No Torque or Acceleration is Slow
·The Inverter in vector control is restricted by the torque compensation limit.
If the torque compensation limit in n109 is set to a value that is too small, the motor
torque will be limited to a low value and sufficient torque will not be available.
If no torque restriction is required, set the parameter to a range from 150% (default
setting) to 200%.
·The stall prevention level during running is too low.
Ifthevalueinn093forstallpreventionlevelduringoperationistoolow,thespeedwill
drop before torque output is turned ON.
Check to be sure that the set value is suitable.
·The stall prevention level during acceleration is too low.
Ifthevalueinn094forstallpreventionlevelduringaccelerationistooslow,theaccel-
eration time will be too long.
Check to be sure that the set value is suitable.
·V/f Control Limit
Unlike vector control, the output torque of the Inverter in V/f control is low at low fre-
quencies. Consider the use of vector control if higher output torque at low frequen-
cies is required.
Maintenance Operations Chapter 8
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