If The Direction Of The Motor Rotation Is Reversed; If The Motor Does Not Put Out Torque Or If Acceleration Is Slow - YASKAWA G7 Series Technical Manual

If the Direction of the Motor Rotation is Reversed

If the motor operates in the wrong direction, the motor output wiring is faulty. When the Drive T1(U), T2(V),
and T3(W) are properly connected to the motor T1(U), T2(V), and T3(W), the motor operates in a forward
direction when a forward run command is executed. The forward direction depends on the manufacturer and
the motor type, so be sure to check the specifications.
The direction of rotation can be reversed by switching two wires among U, V, and W.

If the Motor Does Not Put Out Torque or If Acceleration is Slow

Use the following information is the motor does not output torque or if acceleration is too slow.
The torque limit has been reached.
When a torque limit has been set in parameters L7-01 to L7-04, no torque will be output beyond that limit.
This can cause the torque to be insufficient, or the acceleration time to be too long. Check to be sure that the
value set for the torque limit is suitable.
If torque limits have been set for the multi-function analog input (H3-05 or H3-09 = 10 to 12 or 15), check to
be sure that the analog input value is suitable.
The stall prevention level during acceleration is too low.
If the value set for L3-02 (Stall Prevention Level during Acceleration) is too low, the acceleration time will be
too long. Check to be sure that the set value is suitable.
The stall prevention level during running is too low.
If the value set for L3-06 (Stall Prevention Level during Running) is too low, the speed will drop before out-
putting torque. Check to be sure that the set value is suitable.
Autotuning has not been performed for vector control
Vector control will not be perform if autotuning has not been performed. Perform autotuning separately for the
motor, or set the motor parameters through calculations. Alternatively, change the Control Method Selection
(A1-02) to V/f control (0 or 1).
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Troubleshooting
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