— 11-11 —
11.3.6. Alarm A4: Excess Velocity
This alarm detects that the Motor has continuously rotated faster than the velocity of 11.4 [s
-1
]
for 10 milliseconds or over, exceeding its maximum rotational speed 10 [s
-1
].
Table 11-13: Cause and remedy for the alarm P4
Cause Remedy
(1)
Unmatched combination of Motor
and Driver Unit.
• Check for proper combination
(2)
Motor velocity has exceeded the limit
due to external disturbance.
• Check for cause of the external disturbance.
(3)
Velocity has reached the limit due to
overshooting.
• Refer to “5. Tuning”.
• Reduce the parameter settings of acceleration and deceleration.
(4)
Defective cable, Motor or Driver Unit.
• Follow “Appendix 2: How to Check Motor Condition” for
checking their conditions. Replace the cable or the Motor if
necessary.
• If above procedures do not work, the Driver Unit nay be defective.
Replace it referring to “Appendix 4: Procedure for Replacing the
EDC Driver Unit.”
(1) The maximum rotational speed setting of parameters such as the parameter MV is 10 [s
-1
].
However the maximum rotational speed depends on each Motor model. Refer to “2.5. Motor
Specifications” and set the operating velocity not to exceed the specification.
11.3.7. Warning A5: Home Position Undefined
In case of absolute positioning operation, the Driver Unit specifies the target position in
accordance with the preset home position.
This warning occurs when the command for absolute positioning operation is inputted even the
home position is not yet defined.
◊ The state of undefined home position occurs when the Home Return operation is
interrupted even the command has been executed.
Table 11-14: Cause and remedy for the warning A5
Cause Remedy
(1)
The command for absolute
positioning operation is inputted after
an interruption of Home Return
operation.
• Complete the Home Return operation.
(1) The input ACLR or the command CL clears the warning.
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