Mitsubishi Electric MELSEC iQ-R RD75P4, User Manual

Page: 57 / 598

2 OPR CONTROL
2.2 Machine OPR
55
2
Precautions during the operation
• If the distance set in [Pr.50] Setting for the movement amount after near-point dog ON is shorter than the deceleration
distance from [Pr.46] OPR speed to deceleration stop, Count method movement amount fault (Error code: 1944H) occurs
and the operation does not start.
• If the speed is changed to a speed faster than the speed set in [Pr.46] OPR speed using the speed change function
(

Page 243 Speed change function) during a machine OPR operation, the distance required for deceleration stop may
not be ensured depending on the setting of [Pr.50] Setting for the movement amount after near-point dog ON. In this case,
Count method movement amount fault (Error code: 1944H) occurs and the machine OPR is stopped.
• The following shows the operation performed when the machine OPR is started while the near-point dog is on.
• The near-point dog must be turned off at a sufficient distance from the OP. There is no harm in operation even if the near-
point dog is turned off during a machine OPR. However, ensuring a sufficient distance from the OP is recommended for the
following reasons when the near-point dog is turned off.
• When the machine OPR has been stopped by a stop signal, perform the machine OPR again. If Restart command is turned
on after the stop by a stop signal, OPR restart not possible (Error code: 1946H) occurs.
[Operation when the machine OPR is started from a point
where the near-point dog is on]
(1) A machine OPR is started.
(2) The machine moves at the OPR speed in the direction reverse to the
specified OPR direction.
(3) The deceleration processing is performed according to the setting of [Pr.39]
Stop group 3 sudden stop selection when the off state of the near-point dog
is detected.
(4) After the machine stops, the machine OPR is performed in the specified
OPR direction.
(5) When the machine moves for the movement amount set in [Pr.50] Setting for
the movement amount after near-point dog ON from the point where the on
state of the near-point dog is detected, the machine OPR will be completed.
• If the workpiece is at a point where the near-point dog is still on when the machine OPR is completed, another machine OPR can be performed from
that point even though OPR complete flag ([Md.31] Status: b4) is on.
• If the workpiece is at a point where the near-point dog is off when the machine OPR is completed and another OPR is performed, the workpiece
travels at the OPR speed until it reaches a limit switch. This causes Hardware stroke limit (+)/Hardware stroke limit (-) (Error code: 1905H/1907H). If
a sufficient distance cannot be ensured for Near-point dog signal to be turned on, use the OPR retry function. When the OPR retry function is used,
a retry operation can be performed using limit switches.
ON
OFF
Pr.50
(1) (5)
(4)
(3)
(2)
Near-point dog
Setting for the movement amount
after near-point dog ON