
B-63173EN-1/01-15
7/17
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
In case of start
Suppose that the relation between the position of the CAM follower and the phase
of the CAM shaft is shown in the following figure and the CAM follower points A, B, C
correspond to the CAM shaft points P, P’, P”. Suppose that there is no delay to get
the CAM shaft position to simplify the explanation.
At first, the CAM follower stops at the point A. If CAM follower selection signal
ELCAM*G238 is turned to “1” to start when the CAM shaft comes to the point P, the CAM
follower can synchronize with the CAM shaft without a shock.
If ELCAM* is turned to “1” when the CAM shaft comes to the point P’ where the CAM
follower should not start, the moving distance of the CAM follower is L, because the CAM
follower will move from A to B. If the CAM follower starts moving without any compensation,
the CAM follower is given a big shock. To reduce this shock, the parameter No.8090 to set
the tolerance of the velocity difference of the CAM follower is prepared.
Suppose that the value S is set in this parameter. Then if the velocity difference is
greater than S, the CAM follower is not started and keeps waiting. If the velocity difference
to the point C is S (L’=S), the CAM follower can move at velocity S when the CAM shaft
comes to the point P”. When the CAM follower moves from A to B, the velocity difference
is L and greater than S. In this case, the CAM follower is not moved. If the CAM shaft passes
the point P”, the CAM follower moves to C and synchronizes with the CAM shaft.
•
•
A
B
P
P’
Distance correspond to the
tolerance of the velocity
difference of CAM follower
C
CAM follower selection
signal ELCAM*
•
L
L’
•
•
P’’
0
1
Stop
Start
Waiting for start
CAM shaft revolving
direction
CAM follower motion
CAM shape
CAM
follower
position
CAM shaft
position