Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

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15 USING A DIRECT DRIVE MOTOR
15.3 Operation and functions
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Incremental system
For the incremental system, the magnetic pole detection is required every time the power is turned on.
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.
• Timing chart
*1 The magnetic pole detection time indicates the operation time when LSP (Forward rotation stroke end) and LSN (Reverse rotation
stroke end) are on.
• Direct drive motor movement (when LSP and LSN are on)
*1 When you turn off LSP or LSN during the magnetic pole detection, the magnetic pole detection is carried on to the opposite direction.
When LSP and LSN are off, [AL. 27 Initial magnetic pole detection error] occurs.
• Direct drive motor movement (when LSP or LSN is off)
When LSP or LSN is off at servo-on, the magnetic pole detection is carried out as follows.
15 s or less
ON
OFF
ON
OFF
ON
OFF
95 ms
Servo-on command
Base circuit
RD (Ready)
Magnetic pole detection time
*1
Magnetic pole detection completion position
Servo-on position (Magnetic pole detection start position)
Center of direct drive motor rotation part
LSP *1
LSN *1
10 degrees or less
Magnetic pole detection completion position
Magnetic pole detection
start position
After the machine moves to the position where the stroke limit
(LSP or LSN) is set, the magnetic pole detection starts.
Servo-on position
Center of direct drive motor rotation part
LSP
LSN
10 degrees or less