Mitsubishi Electric MELSEC-Q Series User Manual page 387

Precautions during operation
(1) The error "Count method movement amount fault" (error code: 206) will occur
if the "[Pr.50] Setting for the movement amount after proximity dog ON" is
smaller than the deceleration distance from the "[Pr.46] HPR speed" to "[Pr.47]
Creep speed".
(2) If the speed is changed to a speed faster than "[Pr.46] HPR speed" by the
speed change function (refer to "13.5.1 Speed change function".) during a
machine HPR, the distance to decelerate to "[Pr.47] Creep speed" may not be
ensured, depending on the setting value of "[Pr.50] Setting for the movement
amount after proximity dog ON". In this case, the error "Count method
movement amount fault" (error code: 206) occurs and the machine HPR is
stopped.
(3) The following shows the operation when a machine HPR is started while the
proximity dog is ON.
4)
3)
ON
Proximity dog OFF
Zero signal
Fig. 8.6 Count method 1) machine HPR on the proximity dog ON position
(4) Turn OFF the proximity dog at a sufficient distance from the HP.
Although there is no harm in operation if the proximity dog is turned OFF
during a machine HPR, it is recommended to leave a sufficient distance from
the HP when the proximity dog is turned OFF for the following reason.
If machine HPRs are performed consecutively after the proximity dog is turned
OFF at the time of machine HPR completion, operation will be performed at
the HPR speed until the hardware stroke limit (upper/lower limit) is reached.
If a sufficient distance cannot be kept, consider the use of the HPR retry
function.
(5) When the stop signal stops the machine HPR, carry out the machine HPR
again. When restart command is turned ON after the stop signal stops the
HPR, the error "HPR restart not possible" (error code: 209) will occur.
(6) After the home position return (HPR) has been started, the zero point of the
encoder must be passed at least once before point A is reached.
However, if selecting "1: Not need to pass servo motor Z-phase after power
on" with "Function selection C-4 (PC17)", it is possible to carry out the home
position return (HPR) without passing the zero point.
Pr. 50 Setting for the movement amount
after proximity dog ON
1) 5)
2)
8 - 11
[Operation when a machine HPR is started at the
proximity dog ON position]
1) A machine HPR is started.
2) The machine moves at the HPR speed in the
opposite direction of an HPR.
3) Deceleration processing is carried out when
the proximity dog OFF is detected.
4) After the machine stops, a machine HPR is
carried out in the HPR direction.
5) The machine HPR is completed on detection
of the first zero signal after the travel of the
movement amount set to "[Pr.50] Setting for
the movement amount after proximity dog
ON" on detection of the proximity dog signal
ON.
Chapter 8 HPR Control