7
-18
K
K
K
K
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.
K
K
K
K
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).
K
K
K
K
If
the
Motor
Operates
Higher
Than
the
Reference
Use
the following information if the motor operates higher than the reference.
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