Filter
Top Products
8 - 12
MELSEC-
A
8 ZERO POINT RETURN CONTROL
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.
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]
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
Axis operation status
[RWrn+7, RWrn+15]
t
ON
OFF
Zero point return speed
Torque limit
ON
OFF
OFF
ON
V
Near-point dog
ON
OFF
Zero point signal
Standing by
In zero point return
Standing by
Inconsistent
0
Inconsistent
Value the machine moved is stored
zero point address
Pr.48
Stopper
Valid torque limit range
Deviation counter clear output
Fig. 8.7 Operation when a zero point signal is input before the creep speed is reached