6.1.3
Undershoot Detection Home Return Positioning
Method
< Undershoot detection home return positioning
method >
• 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)
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 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.
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.
➃Set the home position return speed V
RT
as small a
value as possible because there may be a response
lag with the dog switch.
It is recommended to set a V
CR
value small enough
compared with the V
RT
value so that the stop
precision is improved.
➄ 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.
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 VCR
(BFM #11)
Home position
return direction
(BFM #3 10, b9)
$
#
'
&
%
6
FX-1PG/FX
2N
-1PG PULSE GENERATOR UNIT OUTLINE OF OPERATION MODES
6-4
To Next Page
Loading...
Need help?
General