Home Position Return - Mitsubishi Electric MELSERVO-J4 Series Instruction Manual

Home position return

The incremental linear encoder and the absolute position linear encoder have different reference home
positions at the home position return.
Incremental linear encoder
CAUTION
• If the resolution or the stop interval (the third digit of [Pr. PL01]) of the linear encoder is large, the linear servo motor may crash into the stroke end, which is
very dangerous.
■When the linear encoder home position (reference mark) exists in the home position return
direction
Reference home positions are necessary to perform home position return. In the initial setting of [Pr. PL01], reference home
positions are made at every 1048576 pulses starting from the linear encoder home position (reference mark) first passed
through after a home position return. Change the setting value of [Pr. PL01] according to the linear encoder resolution.
[Pr. PL01]
Stop interval setting at the home position return
Setting
Stop interval [pulse]
value
0
1
2
3 1048576 (initial value)
4
5
6
The following shows the relation between the stop interval at the home position return and the linear encoder resolution. For
example, when the linear encoder resolution is 0.001 m and the parameter for the stop interval at the home position return,
[Pr. PL01], is set to "_ 5 _ _" (16777216 pulses), the stop interval is 16.777 mm. The value inside a bold box indicates the
recommended stop interval for each linear encoder resolution.
Pr. PL01 Stop Linear encoder resolution [μm]
interval
0.001
[pulse]
_ 0 _ _ 8192 0.008
_ 1 _ _ 131072 0.131
_ 2 _ _ 262144 0.262
_ 3 _ _ 1048576 1.049
_ 4 _ _ 4194304 4.194
_ 5 _ _ 16777216 16.777
_ 6 _ _ 67108864 67.109
8192
131072
262144
4194304
16777216
67108864
0.005 0.01 0.02
0.041 0.082 0.164
0.655 1.311 2.621
1.311 2.621 5.243
5.243 10.486 20.972
20.972 41.943 83.886
83.886 167.772 335.544
335.544 671.089 1342.177
0.05 0.1 0.2
0.410 0.819 1.638
6.554 13.107 26.214
13.107 26.214 52.429
52.429 104.858 209.715
209.715 419.430 838.861
838.861 1677.722 3355.443
3355.443 6710.886 13421.773
14 USING A LINEAR SERVO MOTOR
[Unit: mm]
0.5 1 2
4.096 8.192 16.384
65.536 131.072 262.144
131.072 262.144 524.288
524.288 1048.576 2097.152
2097.152 4194.304 8388.608
8388.608 16777.216 33554.432
33554.432 67108.864 134217.728
14.3 Operation and functions
14
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