User manual DALLEE ELECTRONICS OPTO-DT

[. . . ] The OPTO-DT can be set for two distinct time functions. 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. [. . . ] The upper right strip is for the emitters (black). 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 emitter/detector devices are supplied, mounted on brackets, with wires attached. When attaching these brackets to the layout please use screws and care so as to minimize vibration to the devices. To extend the distance between the emitter and detector it will be necessary to lengthen the wires. When extending these wires it is absolutely essential that the polarity of the connections from the emitter/detector devices to the OPTO-DT board be maintained. If the polarity is reversed the optical devices will be damaged. It is suggested that when possible only the emitter wires be extended. If you must extend the detector wires, do so sparingly as extra wire length may reduce the sensitivity of the detector. As a further aid in extending the optical range a hood or shield can be installed on the detector. A short length of tubing, heatshrink is ideal, makes an excellent hood. After mounting the optical devices and making all electrical connections to the OPTO-DT board it is time to power up and check the alignment of the optical path. When the alignment is correct the small green LED in the lower right corner of the board will illuminate. Alignment is accomplished mechanically by bending and rotating the mount brackets. 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. [. . . ] The OPTO-DT with only one input set has a jumper bar in place of switch #4. NORMAL is selected when the jumper is closed while an open jumper sets TIMER function. DO NOT place this jumper across the other connector!The output relay of the OPTO-DT is of Double Pole Double Throw configuration with contacts rated at 5 Amps. [. . . ]