2-6
2-6
Line Disconnection, Reverse Wiring, or Out-of-control Errors Occur
Probable cause
Item to check
Countermeasure
Error occurs in the line
disconnection detecting function.
·
The gain is too low.
* If the gain is too low, fine
positioning will require a long
time, which will be determined
as line disconnection.
·
Adjust the gain. (Increase the
gain.)
·
The zero adjustment of the
speed command is not correct.
* If the zero adjustment is
incorrect, the positioning
completion signal will not be
output, which will be
determined as line
disconnection.
* If the zero adjustment is in the
direction opposite to the
fine-speed command, the
motor will rotate in the opposite
direction, which will be
determined as reverse wiring.
·
Make the zero adjustment of the
speed command correctly.
·
External force is affecting the
motor torque on the vertical
shaft.
* If external force is imposed on
the motor in the direction
opposite to fine positioning, the
motor will rotate in the opposite
direction, which will be
determined as reverse wiring.
·
Disable the line disconnection
detecting function.
Note 1.
The absence of the speed command signal, the reverse line connection of A and B phases,
the absence of A and B phases, or noise may be a cause of the abnormal motor operation. If
the motor is in abnormal operation, the cause may be determined by determining the operat-
ing status of the motor at the time of servo-lock and positioning.
Item
Speed command
signal disconnec-
tion
A and B phase re-
verse line connec-
tion
A and B phase line
disconnection
Noise
Servo-lock
Slow rotation
Runaway
Slow rotation
Slow rotation
Positioning
Slow rotation
Runaway
Runaway
Positioning
deviation
S
“Runway” indicates a situation in which the motor is out of control and the motor runs in ac-
celeration exceeding its maximum rotation speed.
S
“Slow rotation” indicates a situation in which the motor runs at low rotation speed due to
Position Control Unit output or Servo Driver input offset.
Refer to
Chapter 4 Countermeasures Against Noise
if noise is the cause of the problem.
Note 2.
Some of the OMRON Position Control Units incorporate a line disconnection detecting func-
tion.
Such a model will be in fine positioning operation automatically when it is turned on, at which
time, if the motor turns in the opposite direction due to reversed wiring or the positioning op-
eration does not complete within the specified period, an error will result.
Connection to Position Control Unit
Chapter 2
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