Mitsubishi Electric MELSERVO-J5 User Manual page 381

• Caution for passing the home position (reference mark)
An interval for turning on home position (reference mark) signal of the linear encoder has a certain width. (Specifications differ
depending on the linear encoder.)
MR-J5 Partner's Encoder User's Manual
Example: When the Z-phase is recognized at startup
B
Home position signal
A recognized as
ON position
The position where LZ (Encoder Z-phase pulse) is turned on depends on the direction of home position passing. In cases
where each homing is required to be completed at the same position, such as dog type homing, start homing with the same
direction.
• Point to note for linear encoder without home position (reference mark)
For the linear encoder without home position (reference mark), LZ (Encoder Z-phase pulse) of the servo amplifier is not
outputted. Check the specifications of the controller for whether LZ (Encoder Z-phase pulse) is necessary or not for homing.
■Absolute position linear encoder
When using an absolute position linear encoder, the data set type homing can also be carried out.
• For proximity dog type homing
For a proximity dog type homing, the nearest reference home position after proximity dog off is the home position. The linear
encoder home position can be set in any position. LZ (Encoder Z-phase pulse) is outputted based on the set value of [Pr.
PL01.2 Homing stop interval setting].
Linear servo
motor speed
0 mm/s
ON
Proximity dog signal
OFF
Reference
home position
Linear servo
motor position
Linear encoder home position
*1 This can be changed with [Pr. PL01].
A
B recognized as ON position
Homing direction
Homing speed
*1
1048576 pulses
1048576 pulses × n
Creep speed
Home position
10 USING A LINEAR SERVO MOTOR
379
10.4 Basic functions
10