Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 347

14. USING A DIRECT DRIVE MOTOR
(2) Operation at the magnetic pole detection
WARNING
CAUTION
The magnetic pole detection is required in the following cases.
1) Using the motor in the incremental system (Refer to (2) (a) of this section.)
2) Using the absolute position detection system with the following cases. (Refer to (2) (b) of this
section.)
When the system is set up (at the first startup of equipment)
When the direct drive motor is replaced
When the Z-phase pulse of the direct drive motor is not turned on manually
When Absolute position erased (25. ) is occurred
Note that the magnetic pole detection automatically starts simultaneously with the
turning-on of the servo-on command.
If the magnetic pole detection is not executed properly, the direct drive motor may
operates unexpectedly.
POINT
Make a machine components for using stroke limits (FLS/RLS). If stroke limits
(FLS/RLS) are not used, the machine may be damaged due to a collision.
At the magnetic pole detection, whether the motor rotates in the forward or reverse
direction is unpredictable.
Depending on the setting value of Parameter No.PL09 (Magnetic pole detection
voltage level), an overload, overcurrent, magnetic pole detection alarm, or others
may occur.
When performing the positioning operation from a controller, use the sequence
which confirms the normal completion of the magnetic pole detection and the
servo-on status, then outputs the positioning command. If the controller outputs the
positioning command before Ready (RD) turns on, the command may not be
accepted or a servo alarm may occur.
After the magnetic pole detection, check the positioning accuracy with the test
operation (positioning operation function) of MR Configurator.
The accuracy of the magnetic pole detection improves with no load.
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