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Text version of the page
| AC Port ac ometer The camera must be informed of the transport speed at all times. A tachometer is typically used to do this. A tachometer outputs a set number of pulses for each rotation its wheel makes. Accu-Sort typically supplies a 20 pulse per inch (20 PPI) tachometer. This tells the camera the precise transport speed, allowing it to determine the exact position of objects on the transport. This information is used when reconstructing the image. The TACH port is a 9-pin "D" female connector, labeled TACH on the camera CCB panel. The drawing below shows the internal circuitry of the port. This information is helpful if you need to create your own cable. | |||||||||||||||||||||
| Figure 4-3: Internal Wiring for TACH Connection | |||||||||||||||||||||
| A A | |||||||||||||||||||||
| CA You must use shielded interface cables with the AV4000. To maintain FCC compliance, the cable shield must make a 360° connection to the shielded mating connector. For the TACH port, A UL Listed cable, rated VW-1, min. 22 AWG must be used. | |||||||||||||||||||||
| MP R A The tachometer input signals (J2 pins 1 and 2) must stay in the range of -0.6 V to 28.2 V relative to the DC common of the camera (J2 pins 3, 5 and 9) to avoid damaging the Zener transient voltage suppressors on the inputs (CR10 and CR13 shown on Figure 4-4). | |||||||||||||||||||||
| P For tachometer mounting instructions, refer to the documentation that came with your tachometer. For setup instructions, reference the Accu-Setup for AccuVision Software Manual. | |||||||||||||||||||||