Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 481

• Linear servo motor movement (when LSP (Forward rotation stroke end) or LSN (Reverse rotation stroke end) is off)
When LSP or LSN is off at servo-on, the magnetic pole detection is carried out as follows.
The linear servo motor moves to a
magnetic pole detection start position
upon servo-on, and the magnetic pole
detection is executed.
Magnetic pole detection
start position
LSN
Magnetic pole detection completion position
The linear servo motor reciprocates several times and returns
to the magnetic pole detection start position to complete the
magnetic pole detection and to go into the servo-lock status.
At this time, there may be a gap, approximately a quarter of
the pitch against magnetic pole, from the start position.
*1 The following shows the pitch against the magnetic pole.
Linear servo motor series
Pitch against magnetic pole [mm]
■For the absolute position linear encoder
The magnetic pole detection will be required with the following timings.
• When the system is set up (at the first startup of equipment)
• After a servo amplifier is replaced
• After a linear servo motor (primary-side or secondary-side) is replaced
• After a linear encoder (scale or head) is replaced or remounted
If a gap is generated to the positional relation between the linear encoder and the linear servo motor, perform
the magnetic pole detection again.
Perform the magnetic pole detection in the following procedure.
1.
Set [Pr. PL01 Linear servo motor/DD motor function selection 1] to "_ _ _ 1" (Magnetic pole detection at first servo-on).
[Pr. PL01]
1
Magnetic pole detection at first servo-on (Initial value)
2.
Execute the magnetic pole detection. Page 478 For the incremental linear encoder
3.
After completing the magnetic pole detection properly, change [Pr. PL01] to "_ _ _ 0" (Magnetic pole detection disabled).
[Pr. PL01]
0
Magnetic pole detection disabled
After the magnetic pole detection, by disabling the magnetic pole detection function with [Pr. PL01], the magnetic pole
detection after each power-on is not required.
Servo-on
position
LSP
LM-H3 LM-U2
LM-F
Medium thrust
(Continuous thrust: Less
than 400 N)
48 30
*1
Large thrust
(Continuous thrust: 400
N or more)
60
14 USING A LINEAR SERVO MOTOR
14.3 Operation and functions
LM-K2
14
48
479