Delta ASDA-A3 Series User Manual page 364

ASDA-A3 Motion Control
 Miscutting prevention mechanism
Sometimes the position of the packing content shifts on the chain conveyor, so the cutter might
cut the content, causing damage to the cutter or machine. To avoid this issue, install a sensor
for preventing miscutting. When the sensor detects no packing contents, it means the content is
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not in the right position and the miscutting prevention mechanism needs to be activated. To use
this mechanism, set the following conditions: the clutch remains engaged when Servo Off, the
E-Cam curve scaling (P5.019) starts taking effect upon the next engagement, and return to the
pre-engage status after disengagement.
When the first set of DO: CAM_AREA1 is rising-edge triggered and the sensor detects no packing
content, use the DI event to trigger the PR path and activate the miscutting prevention
mechanism. Use Macro #F to calculate the deviation between the cutter axis current position and
the target position, and write this deviation data to the specified PR number. Set the E-Cam curve
scaling (P5.019) to 0 and use Macro #8 to activate the scaling setting. When the master axis
keeps operating and the clutch is engaged, the cutter will pause because the scaling setting is 0.
After Macro #8 is triggered, the E-Cam curve scaling (P5.019) is reset to the original value.
Meanwhile, execute the PR incremental position command specified in Macro #F to return the
cutter to the specified position and wait for the pre-enagagement cycle to complete, then the cutter
keeps operating when it is re-engaged.
Miscutting
prevention sensor
Slave axis
position
(PUU)
E-Cam phase (°)
0° 45° 90° 135° 180° 225° 270° 315° 360°
DO: 0x18
CAM_AREA
P5.090 = 180 P5.091 = 280
Figure 7.3.11.5 Miscutting prevention mechanism
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