OnRobot VGC10 User Manual page 10

Safety
CAUTION:
Before pressing the button always make sure that no part will
be dropped due to the loss of gripper power. If Dual Quick Changer is
used it will cycle the power for both sides.
NOTE:
If the robot program is started and one of the safety switches has been
previously pressed, the second popup will appear. The process to unlock
the gripper is the same.
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