6.1.3
Undershoot Detection Home Return Positioning
Method
< Undershoot detection home return positioning
method >
•
With this method, the motor starts deceleration when
thedog is in contact with thedog switch, and the
motor is stopped immediately when the specified
number of zero point signals PG0 are received and
the speed becomes sufficiently slow. (BFM #3 b13
= 0)
➀
With this method, the number of zero point signals
is required to be set so that deceleration is
completed before the stop point.
➁
Set the length L of the dog long enough so that the
dog switch continues to be actuated even when the
dog is at thestop point. This allows thedog
automatically go back and reproach the dog switch
before the home position return operation is
performed again consecutively.
But even if the dog is short, when
the limit switches for detecting the
forward and reverse limits are
connected to the PC, the dog switch can
automatically go back using these limit switches.
(See Section 6.1.4.)
➂
Dispersion in the point at which the dog starts to be
in contact with the dog switch is required to be
adjusted so that the dog switch is actuated within
the interval between two PG0 signals at any time.
➃
Set the home position return speed V
RT
as small a
value as possible because there may be a response
lag with thedog switch.
It is recommended to set a V
CR
valuesmall enough
compared with the V
RT
valueso that thestop
precision is improved.
➄
When the operation is stopped, the error counter
clear signal CLR of the servo amplifier is output.
Thehomeposition (BFMs #14 and #13) valueis
transferred to the current position (BFMs #27 and
#26), and the home position return completed flag
(BFM #28 b2) is set to 1.
ON
OFF
High speed V
RT
(BFMs #10 and #9)
Number of zero point signals (BFM #12)
Example: 5
Dog is in contact
with the dog switch.
Zero point
signal PG0
Degree of deceleration
(BFM #15)
Home position
(BFMs #14 and #13)
Creep speed V
CR
(BFM #11)
Home position
return direction
(BFM #3 10, b9)
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6
FX-1PG/FX
2N
-1PG PULSE GENERATOR UNIT
OUTLINE OF OPERATION MODES
6-4
