
B-63173EN-1/01-15
11/17
EDIT
DATE DESIG. DESCRIPTION
FANUC Power Mate i-MODEL H
Enhancement of Electronic CAM
Function Specifications
DRAW.NO. CUST.
SHEET
01
00.08.07 New design
TITLE
Watching the position of a CAM shaft
Use the position switch signal to watch the position of a CAM shaft. The position switch signal function
watches the machine coordinate at every certain period and outputs the signal when the coordinate is
in the area that is set by the parameters. Control the CAM follower #1, #2, #3 to start or stop by this
signal. Please refer to the “FANUC Power Mate i-MODEL D/H CONNECTION MANUAL (FUNCTION)”
for more detail.
It is necessary to set the same value both in the absolute coordinate and the machine coordinate in
advance, because the machine coordinate is watched by the position switch function. As the output time
of the position switch has a scatter and delay from 24msec to 32msec, set the position switch area
considering this fact. For instance, the output of the position switch signal has delay from 8degree to
12 degree when the velocity of a CAM shaft is 60min
-1
. Therefore set the value of the parameter of the
position switch area before the actual start or stop point by from 8degree to 12degree.
Ex.) In case that a CAM shaft rotates at 60min
-1
and a CAM follower starts when the CAM
shaft comes to the area from 250degree to 270degree,
Area before 8-12degree from 250degree 238-242degree
Area before 8-12degree from 270degree 258-262degree
Then, the area involving above two is
238-262degree
These value is set as the area of position switch signal output to the parameters.
When the position switch area is set to cross the 0degree point of the CAM shaft, the position switch
signal does not output. For instance, it is the case that the area is set from 350 degree to 10degree.
There is another method to watch the position of a CAM shaft, such as PMC functional instruction
(WINDR, PSGN2). But the position switch is better and recommended.
CAM follower
position
CAM shaft
position
CAM shaft revolving
direction
Setting area to output
position switch signal
Set the area of the position switch signal
output before CAM follower start area
by 8-12degree.
CAM follower start area