Mitsubishi Electric MELSEC Q Series Programming Manual page 408

6 POSITIONING CONTROL
6.23.8 Home position return by the data set method 2
(1) Data set method 2
The proximity dog is not used in this method.
(2) Home position return by the data set method 2
Home position is the real position of the servo motor at the home position return
operation.
Home position return
by servo program
start instruction
Fig. 6.39 Home position return operation by the data set method 2
(3) Home position return execution
Home position return by the data set method 2 is executed using the servo
program in Section 6.23.19.
(4) Cautions
(a) A zero point must be passed (zero pass signal: M2406+20n ON) between
turning on the power supply and executing home position return.
If home position return is executed without passing a zero point once, "no
zero point passed error" occurs. If "no zero point passed error" occurred,
perform the home position return again after resetting the error and turn the
servo motor at least one revolution by the JOG operation.
The zero point passing can be confirmed with the zero pass signal
(M2406+20n). However, when "1 : Not need to pass motor Z phase after the
power supply is switched on" is selected in the "function selection C-4
(PC17)" of servo parameter (expansion setting parameter), even if it does
not pass zero point at the servo amplifier power ON, the home position
return is possible because the zero pass signal (M2406+20n) turns ON.
(b) The home position return data required for the data set method 2 are the
home position return direction and home position address.
Machine travel range
Real position of
machine at the home
position return start
6 - 221
Command position
at the home position
return start
Home position is the
real position at the
home position return