Mitsubishi Electric MELSERVO-J4 MR-J4 TM Instruction Manual page 450

15. USING A DIRECT DRIVE MOTOR
1) Timing chart
2) Direct drive motor movement (when LSP or LSN are on)
3) 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.
Magnetic pole detection
start position
ON
Servo-on command
OFF
ON
Base circuit
OFF
ON
RD (Ready)
OFF
Note. The magnetic pole detection time indicates the operation time when LSP (Forward
rotation stroke end) and LSN (Reverse rotation stroke end) are on.
(Note) LSN
Note. When the stroke limit (LSP or LSN) turns off 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.
LSP
LSN
15 - 11
95 ms
15 s or less
Magnetic pole detection time (Note)
Center of direct drive motor rotation part
LSP (Note)
Servo-on position (Magnetic pole detection start position)
Magnetic pole detection completion position
10 degrees or less
Center of direct drive motor rotation part
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