Omron SYSDRIVE 3G3RV, User Manual

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7
-18
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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 Inverter 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 for-
ward
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.
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If the Motor Does Not Put Out Torque or If Acceleration Is Slow
Use
the following information if the motor does not output torque or if acceleration is too slow.
n
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 (H3-09 = 10 to 12 or 15), check to be sure
that
the analog input value is suitable.
n
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.
n
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.
n
V/f control limit
The
output torque at low frequencies is smaller with V/f control than it is for vector control. Consider whether
it
is possible to change to vector control (A1-02 = 2).
n
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 constants through calculations. Alternatively, change the Control Method Selection
(A1-02)
to V/f control (0 or 1).
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If the Motor Operates Higher Than the Reference
Use
the following information if the motor operates higher than the reference.