Mitsubishi Electric MELSEC-L LD75D, User Manual

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[Operation when a machine OPR is started at the near-point dog ON position]
1.
A machine OPR is started.
2.
The machine moves at the OPR speed in the opposite direction of an OPR.
3.
Deceleration processing is carried out by "[Pr.39] Stop group 3 sudden stop selection" when the
near-point dog OFF is detected.
4.
After the machine stops, a machine OPR is carried out in the OPR direction.
5.
The machine OPR is completed after the deviation counter clear output is provided on detection of
the first zero signal after the travel of the movement amount set to "[Pr.50] Setting for the
movement amount after near-point dog ON" on detection of the near-point dog signal ON.
• Turn OFF the near-point dog at a sufficient distance from the OP. Although there is no harm in operation if
the near-point dog is turned OFF during a machine OPR, it is recommended to leave a sufficient distance
from the OP when the near-point dog is turned OFF for the following reason. If machine OPRs are
performed consecutively after the near-point dog is turned OFF at the time of machine OPR completion,
operation will be performed at the OPR speed until the hardware stroke limit (upper/lower limit) is reached. If
a sufficient distance cannot be kept, consider the use of the OPR retry function.
• When a machine OPR is stopped with the stop signal, perform a machine OPR again. If the restart
command is turned ON after a stop with the stop signal, an error "OPR restart not possible" (error code: 209)
occurs.