Mitsubishi FX2N-10GM, Hardware / Programming Manual

Page: 216 / 274

FX Series Positioning Controllers Operation, Maintenance and Inspection 8
8-12
Operation example 3
When it is possible to set the DOG width greater than the motor deceleration to creep distance
• If the ZRN input is turned ON in
the MANU mode or when the
DRVZ instruction is executed in
the AUTO mode, a machine zero
retur n operation will be exe-
cuted.
• The zero return speed, the zero
return direction, the deceleration
time, the creep speed, etc. are
set by parameters.
• Set the parameters so that
deceleration star ts when the
front end of the DOG reaches
the DOG switch and the zero
signal count is started when the
rear end of the DOG reaches the
DOG switch.
• When the PG0 count value
reaches the specified value (set
to PARA 17), travel is stopped,
the clear output (CLR) is issued,
and the zero point address (set
to PARA 16) is written to the
present value register.
Dog search function
The DOG search is performed in the same way as described on the previous page, using a
limit switch.
PARA 9 :
Deceleration
time
PARA 13 : Zero return speed
PARA 15 : Zero return direction
Initial
position
PARA 14 :
Creep speed
PARA 16 :
Machine zero point
address
CLR :
Counter
clear
output
DOG
Front end Rear end
PARA 18 :
Count start timing
PARA 19 :
DOG input logic
PG0 : Zero point signal
PARA 17 :
Number of zero point signals
Count is started
*
* Adjust to ensure that the DOG switch actuation point is
within the period between two consecutive PG0 pulses.
The DOG width must be wider than the machine decelera-
tion distance.