Motor Rotates In The Wrong Direction; Motor Outputs No Torque Or Acceleration Is Slow; Motor Deceleration Is Slow; Motor Burns - Omron SYSDRIVE 3G3JV User Manual

Maintenance Operations
H 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.

8-2-3 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.

8-2-4 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.

8-2-5 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 de-
celeration 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).

8-2-6 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.
8-12
Chapter 8