Delta DVP-PM Series

9 Electrical CAM
DVP-PM Application Manual
9-52
M4
DFLT
D138
D140
M4
M4
..
..
..
DEDIV F2.0 D142
D140
DINT
D142 D144
DSUB
D126
D302
D144
DMOV
D126 D302
Convert the offset value into
floating point value
D142=1/2 D138
Users can decide an
offset ratio
Backup the actual
offset value
Calculate the modified Slave
length according to the actual
offset value
When calculation is finished,
move the length of Slave into
D302
back
Points to note:
1. Users can modify the offset ratio (0.5*D138 ) according to actual needs
2. D132 has to be applied in DTO instruction for creating rotary cut E-CAM Data with offset compensation
in this example
Set up M4 to calculate the actual offset value and the modified Slave length
9.4.2.6 Flying Saw Application –Check cutter position
In flying saw application, it is important to check if the cutter is back in designated position when moving
back. If the cutter is not at designated position, it should remain current speed until limit switch is met,
otherwise the mechanical system might be damaged during the moving back process of cutter. M1757 can
be applied to remain current speed of Slave and continue operation until the limit. Users can compare the
designated position with Master position in current cycle to decide if M1757 needs to be enabled. Master
position in current cycle can be obtained by subtracting “Master position captured at the end of cycle” from
accumulated Master position (DD1862). Master position captured at end of cycle can be read out by using
DFROM instruction (D0 = K10005, Capture mode).
 Application Example
Set up
:
Check if the cutter position is correct and automatically determine the execution of M1757.
Control Steps
:
Step 1: Run the program and read the E-CAM status in capture mode by DFROM instruction. Read the data
in CR#10005 (Capture mode) of special module K100 to D300~D308 at the end of cycle.
Step 2: Substract the captured Master position (D306) from the
number of accumulated MPG input pulses
(D1862), and we can obtain the actual Master position in current cycle (D350).
Step 3: Compare the actual Master position (D350) with the target position (D1842). If the actual Master
position is bigger than the target position and the limit switch has not been triggered, execute M1757 then
stop the CAM operation.