Mitsubishi Electric MELSEC-Q Series User Manual page 389

Restrictions
When this method is used, a deviation will occur in the stop position (HP)
compared to other HPR methods because an error of about 1 ms occurs in taking
in the proximity dog ON.
Precautions during operation
(1) The error "Count method movement amount fault" (error code: 206) will occur
and the operation will not start 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
Fig. 8.8 Count method 2) 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.
Pr. 50 Setting for the movement amount
after proximity dog ON
1) 5)
2)
8 - 13
[Operation when an 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 after moving
the movement amount set in the "[Pr.50]
Setting for the movement amount after
proximity dog ON".
Chapter 8 HPR Control