6. Commissioning
© Festo Didactic 655633 89
6.4.2 Diffuse sensor (Gripper, colour distinction)
The diffuse sensor is used for colour distinction of the workpieces. A fibre optic
cable is connected to a fibre optic unit. The fibre optic unit emits visible red light.
The diffuse sensor detects the light reflected by the workpiece Different surfaces or
colours changes the amount of reflected light.
Prerequisite
– PicAlfa module and fibre optic unit are assembled.
– Gripper is tubed up.
– Compressed air supply switched on.
– Fibre optic unit is wired up.
– Power supply unit switched on.
Execution
1. Mount the fibre optic cable head to the gripper jaw. The head is fitted flush with
the inner surface of the gripper jaw.
2. Connect the fibre optic cables to the fibre optic unit.
3. Place a red workpiece into the receptacle and pick-up the workpiece with the
gripper.
4. Adjust the potentiometer of the fibre optic unit by means of a screwdriver until
the switching status display switches to on.
Note
Maximal 12 revolutions of the adjusting screw are permissible.
5. Place a black workpiece into the receptacle and pick-up the workpiece with the
gripper.
6. Adjust the potentiometer of the fibre optic unit by means of a screwdriver until
the switching status display switches to off.
Note
Maximal 12 revolutions of the adjusting screw are permissible.
7. Check the setting of the fibre optic unit.
Note
Red and metallic workpieces should be detected securely, black workpieces not.
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