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15. USING A DIRECT DRIVE MOTOR
(3) Operation at the magnetic pole detection
WARNING
CAUTION
(a) Incremental system
By turning on the servo-on command from the controller after the power-on, the magnetic pole
detection is automatically carried out. Therefore, there is no need to set the parameter (first digit of
[Pr. PL01]) for executing the magnetic pole detection.
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
Establish the machine configuration to use LSP (Upper stroke end) and LSN
(Lower stroke end). The machine may be damaged due to a collision without
LSP and LSN.
Assign LSP and LSN and perform the magnetic pole detection also in the torque
mode.
At the magnetic pole detection, whether the motor rotates in the forward or
reverse direction is unpredictable.
Depending on the setting value of [Pr. 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 RD (Ready) turns on, the command may not be
accepted or an alarm may occur.
After the magnetic pole detection, check the positioning accuracy with the test
operation (positioning operation function) of MR Configurator2.
The accuracy of the magnetic pole detection improves with no load.
POINT
For the incremental system, the magnetic pole detection is required every time
the power is turned on.
15 - 10
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