Mitsubishi Electric MELSEC Q Series Programming Manual page 428

Motion controller, real mode
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6 POSITIONING CONTROL
(g) Home position return by dogless home position signal reference method
(Operation A)
1) Set the servo parameter (expansion parameter) "Function selection C-4
(PC17)" to "0: Need to pass motor Z phase after the power supply is
switched on". If set to "1: Not need to pass motor Z phase after the
power supply is switched on", when home position return by dogless
home position signal reference method (operation A) is started, a minor
error (error code: 124) will occur and the home position return is not
executed.
2) If the zero pass signal (M2046+20n) was on at home position return start,
this signal turns off once at the home position return start and turns on
again at the next zero point passage.
3) If an external limit switch is detected during a deceleration stop after
zero point detection, an error occurs and stops. Ensure there is enough
distance between the zero point signal and external limit switch, or set
the deceleration time so the decelerating distance is shortened.
4) With home position return retry function valid, if zero point is detected
during a deceleration stop after external limit switch is detected, an error
occurs and stops.
Set the external limit switch in a position that puts the zero signal inside
the external limit switch.
(h) Home position return by dogless home position signal reference method
(Operation B)
1) Set the servo parameter (expansion parameter) "Function selection C-4
(PC17)" to "1: Not need to pass motor Z phase after the power supply is
switched on". If set to "0: Need to pass motor Z phase after the power
supply is switched on", when home position return by dogless home
position signal reference method (operation B) is started, a minor error
(error code: 193) will occur and the home position return is not executed.
2) Home position return retry function cannot be used.
(i) Home position return by dogless home position signal reference method
(Operation C)
1) If an external limit switch is detected during home position return
operation, an error occurs and stops.
2) Home position return retry function cannot be used.
6 - 241

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