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FX-1PG/FX
-1PG PULSE GENERATOR UNIT
2N
6.1.3
Undershoot Detection Home Return Positioning
Method
< Undershoot detection home return positioning
method >
Degree of deceleration
(BFM #15)
Home position
(BFMs #14 and #13)
Creep speed V
CR
(BFM #11)
Number of zero point signals (BFM #12)
Example: 5
ON
OFF
• With this method, the motor starts deceleration when
the dog is in contact with the dog 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)
With this method, the number of zero point signals
is required to be set so that deceleration is
completed before the stop point.
Set the length L of the dog long enough so that the
dog switch continues to be actuated even when the
dog is at the stop point. This allows the dog
automatically go back and reproach the dog switch
before the home position return operation is
performed again consecutively.
OUTLINE OF OPERATION MODES
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.)
High speed V
RT
(BFMs #10 and #9)
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
Home position
the interval between two PG0 signals at any time.
return direction
Set the home position return speed V
(BFM #3 10, b9)
value as possible because there may be a response
Dog is in contact
lag with the dog switch.
with the dog switch.
It is recommended to set a V
compared with the V
Zero point
precision is improved.
signal PG0
When the operation is stopped, the error counter
clear signal CLR of the servo amplifier is output.
The home position (BFMs #14 and #13) value is
transferred to the current position (BFMs #27 and
#26), and the home position return completed flag
(BFM #28 b2) is set to 1.
6
as small a
RT
value small enough
CR
value so that the stop
RT
6-4
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