Mitsubishi Electric MELSEC Q Series Programming Manual page 406

6 POSITIONING CONTROL
(3) Home position return execution
Home position return by the count method 3 is executed using the servo program
in Section 6.23.19.
(4) Cautions
(a) A system in which the servo motor can rotate one time or more is required.
(b) After the proximity dog ON, when a servo motor rotates one time to reverse
direction after stop with travel value set in the "travel value after proximity
dog ON", make a system which does not turn OFF the external upper/lower
stroke limit.
(c) Home position return and continuously start of home position return are also
possible in the proximity dog ON in the count method 3.
When the home position return and continuously start of home position
return are executed in the proximity dog ON, the home position return is
executed after return the axis once to position of the proximity dog OFF.
(d) When the "travel value after proximity dog ON" is less than the deceleration
distance from "home position return speed" to "creep speed", a minor error
(error code: 209) will occur and deceleration stop is made.
(e) 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 zero pass signal (M2406+20n) turns
ON. This operation is the same as count method 1.
(f) If in-position signal (M2402+20n) does not turn ON, home position return is
not ended.
REMARK
The signal types that can be used with home position return by the count method 3
are shown below.
Signal type
DOG signal of Q172DLX
External input signal (DOG) of servo amplifier
(DOG)
Built-in interface in Motion CPU (DI)
Bit device
Ver.!
: Refer to Section 1.3 for the software version that supports this function.
Q173DSCPU/
Q172DSCPU
6 - 219
Q173DCPU(-S1)/
Q172DCPU(-S1)
Ver.!
: :
Usable, Unusable