55
3G3JV Maintenance Operations Chapter7
The motor only rotates in one direction.
• Reverse rotation-prohibit is selected.
If n05 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.
7-2-3 Motor Rotates in the Wrong Direction
• The output wiring of the motor is faulty.
When the U/T1, V/T2, and W/T3 terminals of the Inverter are properly connected to the
T1(U), T2(V), and T3(W) terminals of the motor, the motor operates in a forward direction
when a forward rotation command is executed. The forward direction depends on the maker
and the motor type. Therefore, be sure to check the specifications.
Switching two wires among the U/T1, V/T2, and W/T3 will reverse the direction of rotation.
7-2-4 Motor Outputs No Torque or Acceleration is Slow
• The stall prevention level during running is too low.
If the value in n57 for stall prevention level during operation is too low, the speed will 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.
If the value in n56 for stall prevention level during acceleration is too slow, the acceleration
time will be too long.
Check to be sure that the set value is suitable.
7-2-5 Motor Deceleration is Slow
• The deceleration time setting is too long.
Check the deceleration time settings in n17 and n19.
• Stall Prevention during Deceleration
The Inverter incorporates a stall prevention function that will automatically prolong the period
of deceleration if the motor has an excessive amount of regenerative energy. This function will
operate if the period of deceleration is longer than the set value. If the period of deceleration
needs to coincide with the set value, use an Inverter model with a larger capacity or a model
incorporating a function to process regenerative energy (such as the SYSDRIVE
3G3MV or
3G3EV-series Inverter).
7-2-6 Motor Burns
• The load is too big.
If the load of the motor is too big and the motor is used with the
effective torque exceeding the
rated torque of the motor, the motor will burn out. For example, the rated torque of the motor
and capacity may be limited to eight hours of use if the inscription on the motor states that the
motor is rated for eight hours. If the 8-hour rated torque is used for normal operation, it may
cause the motor to bun out.
Reduce the load amount by either reducing the load or lengthening the
acceleration/deceleration time. Also consider increasing the motor capacity.
To Next Page
Loading...
