Mitsubishi Electric MR-J4, Instruction Manual

Page: 582 / 794

15. USING A LINEAR SERVO MOTOR
15 - 15
(a) For the incremental linear encoder
POINT
For the incremental linear encoder, the magnetic pole detection is required
every time the power is turned on.
By turning on SON (Servo-on) after 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
15 s or less
ON
OFF
ON
OFF
ON
OFF
95 ms
SON (Servo-on)
Base circuit
RD (Ready)
Magnetic pole detection time (Note)
Note. The magnetic pole detection time indicates the operation time when LSP (Forward
rotation stroke end) and LSN (Reverse rotation stroke end) are on.
2) Linear servo motor movement (when LSP (Forward rotation stroke end) and LSN (Reverse
rotation stroke end) are on)
LSN
(Note 1)
LSP
(Note 1)
(Note 2)
Magnetic pole detection completion position
Servo-on position
(Magnetic pole detection start position)
Note 1.
2.
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.
The following shows the pitch against the magnetic pole.
Linear servo motor series
LM-H3
LM-F
LM-U2
LM-K2
Medium thrust
(Continuous thrust:
Less than 400 N)
Large thrust
(Continuous thrust:
400 N or more)
Pitch against magnetic pole
[mm]
48 30 60 48