User manual DALLEE ELECTRONICS OPTO-DT (REV 1)

[. . . ] In NORMAL function, with the time adjustment at minimum setting, the relay will be activated (on) when the infra-red beam is interrupted and relaxed (off) when the beam is restored. As the time adjustment is increased a minimum (on) time for the relay is established. When the beam is broken the relay is (on) for at least the minimum time period. If the beam remains interrupted beyond the minimum time period the relay stays (on) until the beam is restored. [. . . ] The further apart the optical devices are mounted the more critical precise alignment becomes. The multiple input version of the OPTO-DT has a block of four small rocker type switches which are used to change functions. Switches #1, #2 and #3 are for selecting and aligning the optical sets. If you are using less than three optical sets with this OPTO-DT, the switch for the unused set must be in the open position. For adjustment of alignment, turn the selected switch to the closed position and leave the other two switches open. This will allow each of the optical sets to be independently selected for alignment. When alignment has been completed, return the switches for the optical sets to their closed positions which is the normal position for operation. Rocker switch #4 is used to determine which time function is to be selected. When switch #4 is closed the NORMAL function is operational. In NORMAL function, the relay is activated when the optical path is interrupted and relaxed when the optical path is restored. There is a time adjustment potentiometer located above the relay, adjacent to upper left terminal #1. Full counter clockwise rotation of this potentiometer corresponds to minimum The second set of terminal strips, to the lower right, are used to connect the optical input sets (optical detectors, black units). The copper wire of the detector connects to terminal #1 and the silver wire connects to #4. In the multiple version the copper wires from the second and third detectors connect to #2 and #3. All silver wires from the detectors connect to terminal #4. These should not be connected in reverse polarity since damage to the detectors may occur!The upper right strip is for the emitters (clear). The copper wire of the emitter connects to terminal #1 and the silver wire connects to terminal #4. In the multiple version the emitters must be connected in series. The copper wire of the first emitter connects to terminal #1, silver wire connects to the copper of the second emitter (#2), whose silver then connects to the copper of the third emitter(#3). The silver wire of the last emitter always connects to terminal #4. These series connections can be made at the #2 and #3 terminals as indicated above or directly, wire to wire, at the layout location. [. . . ] The output relay of the OPTO-DT is of Double Pole Double Throw configuration with contacts rated at 5 Amps. There may be situations where you may desire to have additional relay contacts available. At the left edge of the OPTO-DT board, just above the lower left terminal strip, there are two pads on the board. These pads allow for a second relay (Item #555) to be operated by the OPTO-DT. [. . . ]