Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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14 USING A LINEAR SERVO MOTOR
14.3 Operation and functions
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14
Operation at the magnetic pole detection
• Establish the machine configuration to use LSP (Forward rotation stroke end) and LSN (Reverse rotation
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 linear servo motor moves in the positive or negative 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.
• When the absolute position linear encoder is used, if a gap is generated to the positional relation between
the linear encoder and the linear servo motor, perform the magnetic pole detection again.
• The magnetic pole detection improves in accuracy when performed with no load.
• An alarm may occur when the linear encoder is not mounted properly, or when the linear encoder resolution
setting ([Pr. PL02] and [Pr. PL03]) or the setting value of [Pr. PL09 Magnetic pole detection voltage level] is
incorrect.
• For the machine whose friction becomes 30% or more of the continuous thrust, the linear servo motor may
not operate properly after the magnetic pole detection.
• For the horizontal shaft of the machine whose unbalanced thrust becomes 20% or more of the continuous
thrust, the linear servo motor may not operate properly after the magnetic pole detection.
• The magnetic pole detection may fail if performed simultaneously with multiple axes connected to each
other (e.g. a tandem configuration). Perform the magnetic pole detection for each axis. At this time, set the
axes for which the magnetic pole detection is not performed to servo-off.
WARNING
• Note that the magnetic pole detection automatically starts simultaneously with the turning-on of the servo-on command.
CAUTION
• If the magnetic pole detection is not executed properly, the linear servo motor may operate unexpectedly.