Advertisement
8 ZERO POINT RETURN CONTROL
Machine zero point return start
(Positioning start signal)
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]
Deviation counter clear output
Axis operation status
[RWrn+7, RWrn+15]
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
Fig. 8.7 Operation when a zero point signal is input before the creep speed is reached
Restrictions
(1) Make sure to limit the torque for the servomotor after starting the deceleration
to " Pr.49 Creep speed". 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) "Stopper stop method 2)" cannot use the zero point return retry function.
Precautions during operation
(1) Input a zero point signal from an external source after the machine presses
against the stopper.
If the zero point signal is input before deceleration to " Pr.49 Creep speed",
the machine is immediately stopped as-is.
(2) The near-point dog must be kept turned ON until contact with the stopper.
OFF
OFF
OFF
Standing by
Inconsistent
Inconsistent
V
Zero point return speed
Pr.48
Zero point signal
Torque limit
ON
Near-point dog
OFF
ON
ON
In zero point return
0
Value the machine moved is stored
8 - 12
MELSEC-A
Stopper
Valid torque limit range
ON
Standing by
zero point address
t
Advertisement
Chapters
Troubleshooting
