Mitsubishi Electric MELSERVO-J4 MR-J4 TM Instruction Manual page 424

14. USING A LINEAR SERVO MOTOR
(a) For the incremental linear encoder
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 not need to set the parameter (first digit of
[Pr. PL01]) for executing the magnetic pole detection.
1) Timing chart
2) Linear servo motor movement (when LSP (Forward rotation stroke end) and LSN (Reverse
rotation stroke end) are on)
Note 1. When LSP (Forward rotation stroke end) or LSN (Reverse rotation stroke end) turns off during the magnetic pole detection, the
operation of the magnetic pole detection is carried on to the opposite direction. When both LSP and LSN are off, [AL. 27 Initial
magnetic pole detection error] occurs.
2. The following shows the pitch against the magnetic pole.
POINT
For the incremental linear encoder, 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 LSP (Forward
rotation stroke end) and LSN (Reverse rotation stroke end) are on.
(Magnetic pole detection start position)
LSN
(Note 1)
Linear servo motor series
Pitch against magnetic pole
[mm]
ON
OFF
95 ms
ON
OFF
ON
OFF
15 s or less
Magnetic pole detection time (Note)
Servo-on position
(Note 2)
Magnetic pole detection completion position
LM-H3
Medium thrust
LM-F
(Continuous thrust:
Less than 400 N)
48 30
14 - 15
LSP
(Note 1)
LM-U2
Large thrust
(Continuous thrust:
400 N or more)
60
LM-K2
48