COGNEX® Checker® 3G Series User’s Guide
What is Checker 3G and what does it do? Table of Contents Checker 3G is a programmable vision sensor that verifies the presence and appearance of objects. COGNEX You configure Checker 3G by creating one or more Jobs using a SensorView Teach Pendant or a PC connected to the Checker 3G’s USB port. Checker’s One-Click™ sensors let you check the presence, absence, appearance, and size of part features with a single click OR + 24 VDC − Once configured, Checker 3G is placed in Run Mode.
Checker 3G Products and Accessories Flying Lead Cable (C3G-CBL-001) Connects Checker directly to your equipment (5m). Checker 3G Series Systems 3G1 Part Detection √ Trigger Input Line √ M12 USB Cable (CKR-200-CBL-USB) Discrete Outputs 2 Personalities 2 Provides an IP67-compliant USB connection from Checker to the PC (5m). Presence √ Measurement √ I/O Extender (CKR-200-CBL-EXT) Power and I/O extension cable (5m).
Dimensions and Features 4 3 67 (2.64) 67 (2.64) 2 2 22 (0.87) 22 (0.87) 6 39 (1.54) 39 (1.54) 60 (2.36) 60 (2.36) 7 6 mm (in) mm (in) 1 1 Mounting holes (M4 x 4 mm) 2 Focus lock (M3, use 2.5 mm hex key) 3 Lens cover/focus ring 4 Status LED (GREEN): 1 41 (1.61) 41 (1.61) 27.5+0.5 27.5+0.5 (1.08+0.02) (1.08+0.
Getting Started Step Using SensorView Teach Pendant Using a PC 1: Review system requirements • • A PC with: • SensorView Teach Pendant v 2.4 or newer 24 VDC power supply, 525 mA (250 mA for Checker 3G, 275 mA for SensorView Teach Pendant) USB cable • Microsoft® Windows® 2000™ SP4, Windows XP™, or Windows Vista™ • 128 MB RAM • USB 1.1 (2.0 recommended for best performance) • 1024 x 768 (96 DPI) or 1280 x 1024 (120 DPI) display and • • 2.
Verify Checker is Working -- Teach Pendant COGNEX Verify Checker is Working -- PC SensorView should display the Setup mode home screen, as shown here. The PC software should automatically connect to Checker 3G and display an image.
Checker User Interface -- Teach Pendant SensorView Teach Pendant provides an interactive interface that lets you configure, manage, and monitor a Checker 3G. For general information on how to use this interface, see the SensorView Teach Pendant Users Guide and Reference. 6 COGNEX 1 Setup mode home screen. Each of the four steps at the left includes substeps to let you create and modify Checker 3G jobs. 2 Navigation keys. Use these keys to select which item is active on the Checker 3G screen.
Checker User Interface -- PC The Checker User Interface is PC software that lets you control Checker. You use this program to view Checker images, create and modify Checker Jobs, and to monitor running Checkers. 1 1 Menu bar and status pane. The menu bar lets you open and save jobs and manage Checker personalities and system settings. The status pane shows which Checker is connected, the Job name and if it has been saved, along with results for the most recent image. 2 Checker steps.
Checker Part Triggers Choosing a Trigger Type A part trigger tells Checker that a part is ready to be inspected. Checker supports three trigger types. You set the trigger type in the Start ►Select Trigger step on SensorView Teach Pendant or the Select Part Trigger step on the PC. In most cases, it is simplest to use the Internal Part Trigger, since no external equipment is required.
Part Finding Sensor Part Finding Sensors and Trigger Types A Part Finding Sensor detects and locates your part in the image. You create a Part Finding Sensor by drawing a box around a feature of part that is present on both good and bad parts. Part Finding Sensors are used differently for different trigger types. 1 2 • With an Internal Trigger, a Part Finding Sensor is required. The Part Finding Sensor tells Checker that a part is present.
Presence Sensors Sensor Threshold Presence Sensors evaluate part of a Checker image to determine if a feature is present or not. The sensor threshold slider sets the level below which a sensor fails and above which a sensor passes. In many cases, the default value works well. If you adjust the slider, set it so that it is mid-way between the level for good parts and bad parts.
Measurement Sensors How to use the Measurement Sensor Controls Measurement Sensors evaluate part of a Checker image to determine if a feature is within a specified size range. In most cases, there is no need to change the one-click setup sensor. Features that are too large or too small will fail, while features that are the correct size will pass. You use the controls shown below to adjust a measurement sensor.
Advanced Measurement Sensor Features Selecting the Edge Search Rule Normally, width and height sensors measure the edges that are closest to the caliper blades while diameter sensors measure the strongest edges. Adjusting Edge Sensitivity The sensitivity control for measurement sensors controls how many edges the sensor evaluates when measuring your feature. As you move the sensitivity slider, the sensor displays the edges that it finds as yellow lines.
Job Control The example below shows how to load the Job in slot 5: Checker 3G has eight Job slots. You can assign saved Checker Jobs to Job slots, then load them while Checker is running by sending Job Select and Job Change signals to Checker through its input lines. 1 You can assign a Job saved on a Checker to any Job slot using the Main Menu ►Job Control screen on SensorView Teach Pendant or selecting Checker->Set up Job Control on the PC.
External Retrain You can configure both Part Finding Sensors and Pattern Sensors to be retrainable by checking External Retrain in the sensor control panel. Whenever Checker receives a signal on the RETRAIN line, Checker retrains any retrainable Part Finding Sensors and Pattern Sensors using the part of most recently acquired image that lies within the retrain region.
Run Time Display Run Time Recording Run Time Display lets you control what images, if any, are displayed by Checker in Run mode. Run Time Recording lets Checker record and save specific images while it is running, even when not connected to SensorView Teach Pendant or a PC. You can choose from among any of the current Checker results. You configure Run Time Display from the Main Menu ►Display and Record screen on SensorView Teach Pendant or the Display and Record step on the PC.
Filmstrip Control -- SensorView The Filmstrip Control lets you record and play back Checker images. 3 1 Image source selector: Controls source of images in Setup mode. 2 Click to add one or more images to the Filmstrip. 3 Filmstrip display. Click on an image to view it. Blue bars separate images of a single detected part (in Internal Part Trigger mode). 4 Filmstrip clear, load, and save controls.
Filmstrip Control -- PC The Filmstrip Control lets you record and play back Checker images. 1 2 5 3 6 4 7 34 1 Filmstrip mode selector 2 Record button. Click (or press F5) to add an image to the Filmstrip. 3 Recording rate. How many images per second are added to the Filmstrip. 4 Filmstrip display. Click on an image to view it. Blue bars separate images of a single detected part (in Internal Part Trigger mode). 5 Playback button (only enabled in Playback mode).
Input/Output Wiring Circuit Diagrams (Typical) The leads in the flying lead cable (C3G-CBL-001) are color-coded to indicate which signal is carried on which line. The corresponding pins on the M12 connector are provided as well.
Input/Output Wiring Examples + 24 VDC − Trigger from PLC (Checker sources current) and Ouput to PLC (Checker sinks current) 24 VDC+ POWER IN (RED) GROUND (BLACK) DC + DC common Sink Source TRIGGER (ORANGE) INPUT COMMON (WHITE/VIOLET) Photosensor trigger (Checker sources current) + 24 VDC − DC OUT DC IN 0 1 2 3 4 5 COM 0 1 2 3 4 5 COM DC OIN DC OUT 0 1 2 3 4 5 COM 0 1 2 3 4 5 COM 24 VDC+ POWER IN (RED) GROUND (BLACK) + 24 VDC − 24 VDC+ POWER IN (RED) GROUND (BLACK) TRIGGER (ORANGE) INPUT C
Working Distance and Field of View Adjusting Focus The distance from Checker’s lens cover to your part is the working distance; the field of view is what Checker can see at that distance. As the working distance increases, so does the size of the field of view. Adjust focus using the clear ring on Checker. Using the supplied 2.5 mm hex key, you can lock the focus adjustment by tightening the focus lock. These charts show the field of view provided by the standard 5.
Changing Lenses 1 To remove the Checker lens, follow the steps listed below. 1 Screw lens into Checker at least five full rotations. 1 Unscrew lens cover. Lens is secured to lens cover by small internal O-ring. 2 Make sure both outer and inner O-rings are seated in place on the lens cover. 2 When lens is fully released, remove cover with lens in place. 3 Firmly and evenly press the lens cover onto Checker until it snaps into place. 3 Remove lens from lens cover.
Mounting Checker XX XX The optional Checker mounting bracket lets you easily position and adjust Checker on your line. Caution: Do not use a mounting screw with an exposed thread depth of greater than 5mm. Allowing the mounting screw to bottom in the mounting hole can damage Checker. Caution: The maximum torque for a mounting screw is 1.8 nM (16 inch-pounds). Exceeding this torque value can damage Checker.
Specifications Precautions Observe these precautions when installing Checker to reduce the risk of injury or equipment damage: Cable 24AWG, 5 m, M12 connector (power and I/O) Power requirements Voltage: +24 VDC (22-26 VDC) Current: 250 mA max • Discrete Inputs Input ON: > 10 VDC (> 6 mA) Input OFF: < 2 VDC (< 1.5 mA) Protection: Opto-isolated, polarity-independent • • Discrete Outputs Output: Solid state switch Rating: 100 mA, 24 VDC Max Max voltage drop: 3.
COGNEX® 590-7096
