Mitsubishi Electric MR-J4W2-0303B6 Instruction Manual page 352

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.
1) Timing chart
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
operate unexpectedly.
POINT
Establish the machine configuration using FLS (Upper stroke limit) and RLS
(Lower stroke limit). Otherwise, 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 [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 a servo 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.
Servo-on command
Base circuit
RD (Ready)
Note. The magnetic pole detection time indicates the operation time when FLS (Upper
stroke limit) and RLS (Lower stroke limit) are on.
ON
OFF
95 ms
ON
OFF
ON
OFF
15 s or less
Magnetic pole detection time (Note)
15 - 11