Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 505

■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
ON
Servo-on command
OFF
ON
Base circuit
OFF
ON
RD (Ready)
OFF
*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)
Center of direct drive motor rotation part
LSN *1
LSP *1
Servo-on position (Magnetic pole detection start position)
Magnetic pole detection completion position
10 degrees or less
*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.
LSN
Magnetic pole detection
start position
95 ms
15 s or less
*1
Magnetic pole detection time
Center of direct drive motor rotation part
LSP
Servo-on position
After the machine moves to the position where the stroke limit
(LSP or LSN) is set, the magnetic pole detection starts.
Magnetic pole detection completion position
10 degrees or less
15 USING A DIRECT DRIVE MOTOR
15.3 Operation and functions
15
503