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8 ZERO POINT RETURN CONTROL
Restrictions
(1) Always limit the servomotor torque after the "
Pr.49 Creep speed" is reached.
If the torque is not limited, the servomotor may fail when the machine presses
against the stopper. (Refer to section "12.4.2 Torque limit function".)
(2) Use an external input signal as the zero point signal.
(3) The zero point retry function cannot be used in "stopper stop method 3)".
Precautions during operation
(1) If the zero point signal is input before the workpiece stops at the stopper, the
workpiece will stop at that position, and that position will become the zero
point.
At this time, an error will not occur.
t
ON
OFF
ON
OFF
OFF
ON
V
0
Pr. 49 Creep speed
Valid torque limit range
Machine zero point return start
(Positioning start signal)
Axis operation status
[RWrn+7, RWrn+15]
Value the machine moved is stored
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]
Zero point address
Inconsistent
Standing by
In zero point return
Inconsistent
Standing by
Md.30 Machine feed value
Torque limit
Zero point signal
Deviation counter clear output
Stopper
Fig. 8.10 When the zero point signal is input before the stop at the stopper
(2) If the restart command is turned ON after machine zero point return is stopped
upon a stop signal, an error “zero point return restart not possible” (error code:
209) occurs.