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8 ZERO POINT RETURN CONTROL
8.2.5 Zero point return method (3): Stopper stop method 2)
The following shows an operation outline of the "stopper stop method 2)" zero point
return method.
Operation chart
1)
The machine starts a machine zero point return.
(The machine starts acceleration specified in "
Pr.53
Zero point return acceleration time selection" in the
direction set in "
Pr.46
Zero point return direction", and moves at " Pr.48 Zero point return speed".)
2)
The machine detects near-point dog ON and starts deceleration.
(At this time, torque limit is required. If torque limit is not applied, the servomotor may fail at 4).)
3)
The machine decelerates to "
Pr.49 Creep speed" and then moves at the creep speed.
4) The machine comes into contact with the stopper at the creep speed, and stops.
5)
At the zero point signal after the stop, pulse output from the D75P2 stops and "deviation counter clear
output" is output to the drive unit.
6)
After the completion of "deviation counter clear output", the zero point return complete flag (RX(n+2)0,
RX(n+5)0) turns from OFF ON and the zero point return request flag (RX(n+1)F, RX(n+4)F) turns from
ON
OFF.
Machine zero point return start
(Positioning start signal)
Deviation counter clear output
Axis operation status
[RWrn+7, RWrn+15]
Zero point return request flag
[RX(n+1)F, RX(n+4)F]
Zero point return complete flag
[RX(n+2)0, RX(n+5)0]
Md.44 Movement amount
after near-point dog ON
Current feed value
[RWrn+0 to 1, RWrn+8 to 9]
Md.30 Machine feed value
t
ON
OFF
ON
OFF
OFF
ON
0
V
ON
Zero point signal
1)
2) 3) 4)
Pr. 48 Zero point return speed
Pr. 49 Creep speed
Stops at stopper
6)
5)
Valid torque limit range
Near-point dog OFF
Torque limit
Standing by
Inconsistent
Inconsistent
In zero point return
Value the machine moved is stored
Standing by
Zero point address
Fig. 8.6 Stopper stop method 2) machine zero point return