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

14. USING A LINEAR SERVO MOTOR
2) Specify the setting value that is an approximately 70% of the value set when [AL. 50 Overload 1],
[AL. 51 Overload 2], [AL. 33 Overvoltage], [AL. E1 Overload warning 1], and [AL. EC Overload
warning 2] occurred as the final setting value. However, if [AL. 27 Initial magnetic pole detection
error] occurs with this value, specify a value intermediate between the value set at [AL. 50
Overload 1], [AL. 51 Overload 2], [AL. 33 Overvoltage], [AL. E1 Overload warning 1], and [AL. EC
Overload warning 2] and the value set at the magnetic pole detection alarm as the final setting
value.
3) Perform the magnetic pole detection again with the final setting value to check there is no
problem.
(c) Setting example
Linear encoder magnetic
pole detection
[Pr. PL09] setting
Occurring
Alarm
Not occurring
In this example, the final setting value of [Pr. PL09] is 49 (Setting value at the alarm occurrence = 70
× 0.7).

14.3.3 Home position return

(1) Incremental linear encoder
CAUTION
(a) When the linear encoder home position (reference mark) exists in the home position return direction
When an incremental linear encoder is used, the home position is the position per 1048576 pulses
(changeable with the third digit of [Pr. PL01]) with reference to the linear encoder home position
(reference mark) passed through first after a home position return start. Change the setting value of
[Pr. PL01] according to the linear encoder resolution.
30 35 40
While increasing the setting value of [Pr. PL09], carry out the
magnetic pole detection repeatedly.
POINT
The incremental linear encoder and the absolute position linear encoder have
different reference home positions at the home position return.
If the resolution or the stop interval (the third digit of [Pr. PL01]) of the linear
encoder is large, it is very dangerous since the linear servo motor may crash into
the stroke end.
[Pr. PL01]
45 65
Stop interval setting at the home position return
Setting
Stop interval [pulse]
value
0 8192
1 131072
2 262144
3 1048576 (initial value)
4 4194304
5 16777216
6 67108864
14 - 18
70
An alarm has occurred when the setting
value of [Pr. PL09] is set to 70.