336
10 USING A LINEAR SERVO MOTOR
10.3 Startup [A]
• 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 performed as follows.
*1 The following shows the pitch against the magnetic pole.
■For absolute position linear encoder
The magnetic pole detection is required in the following cases.
• When the system is set up (at initial 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.
1. Execute the magnetic pole detection.
Page 322 Operation at magnetic pole detection
Page 322 For incremental encoder
2. After the completion of the magnetic pole detection, change [Pr. PL01.0 Servo motor magnetic pole detection selection]
to "0" (magnetic pole detection disabled).
When [Pr. PL01.0] is set to "0" (magnetic pole detection disabled) after the magnetic pole detection, the magnetic pole
detection at each power-on is not required.
How to replace servo amplifier without magnetic pole detection
Refer to the following.
Page 325 How to replace servo amplifier without magnetic pole detection
Linear servo motor series LM-H3
LM-F
LM-U2 LM-K2 LM-AJ
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 20
Servo parameter Description
PL01.0 Servo motor magnetic pole detection selection
0: Magnetic pole detection disabled
1: Magnetic pole detection at initial servo-on after cycling the power
5: Magnetic pole detection at every servo-on
Initial value: 1 (magnetic pole detection at initial servo-on after cycling the power)
LSN LSP
The linear servo motor moves to the magnetic pole detection start position
upon servo-on, and the magnetic pole detection is executed.
Magnetic pole detection
start position
Servo-on position
Magnetic pole detection completion position
*1
The linear servo motor reciprocates several times and returns to the magnetic pole detection start position
to complete the magnetic pole detection, and then changes 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.
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