Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

Page: 268 / 500

13. USING A LINEAR SERVO MOTOR
13 - 19
(a) For the incremental linear encoder
For the incremental linear encoder, 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
parameter No.PS01) for executing the magnetic pole detection.
1) Timing chart
ON
OF
ON
OF
ON
OF
95ms
Servo-on command
Base circuit
Ready (RD)
15s or less
Magnetic pole detection time (Note)
Note. The magnetic pole detection time indicates the operation time when the stroke limits
(FLS and RLS) is ON.
2) Linear servo motor movement (when FLS and RLS are ON)
Servo-on position
(Magnetic pole detection start position)
RLS
(Note 2) FLS
(Note 1)
(Note 2)
Magnetic pole detection complete position
Note 1. When the stroke limit (FLS or RLS) turns OFF during the magnetic pole detection, the
operation of magnetic pole detection is carried on to the opposite direction. When
both FLS and RLS are OFF, the magnetic pole detection error (27. ) occurs.
2. The following shows the pitch against magnetic pole.
Linear servo motor series LM-H2
LM-U2
(Medium
thrust)
LM-K2
Pitch against magnetic pole
[mm]
48 30 48