CirKits.com DAS1-c1 Dark Activated Switch Alignment Instructions Work with the board mounted on a non-conductive surface, or mount the board permanently to a metal plate using spacers. You will need a DC variable voltage power source such as a lab supply, the assembled Dark Activated Switch circuit board and a volt meter. Make sure that the power source is connected with the correct polarity. CAUTION: the first time the board is connected to the power source, it is advisable to make a brief connection to be sure that there are no high current shorts from the soldering job. Rechargeable batteries have the ability to produce large amounts of current, short circuiting batteries can cause fires. Remove metal jewelry when working with batteries. Keep loose wire and metal away from the circuitry. The customer assumes all liability for any damages. []Use a variable voltage DC power supply set to 11V DC. If you don't have an 11V supply, you can use a rechargeable battery that has been discharged to 11V. []Connect the board's BAT - terminal to the DC supply's - terminal. []Connect the board's BAT + terminal to the DC supply's + terminal. Use a Red positive (+) wire and a black negative (-) wire for the battery wires. []Turn the three position switch to the On (right) side. The potentiometers have a full range of 25 turns, they make a clicking sound when they are at the endpoints. []Turn the LVD setpoint potentiometer RV1 counter-clockwise until the two white LEDs turn on. []Slowly turn RV1 clockwise until the LEDs turn off. The low voltage disconnect setting is now at 11V DC. For other LVD setpoints, adjust the power supply to the desired LVD setpoint and repeate the last two instructions. If you raise and lower the variable DC supply's voltage, the LEDs should turn off at 11V and on at 11.9V due to the circuit's hysteresis action. Hysteresis width can be adjusted by changing R11. []Turn the three position switch to the Auto (left) side. []Make sure the CDs cell is attached to the 2 pin connector. []Turn RV2 counter-clockwise 25 turns, the LEDs should turn off. []Place the CDs sensor in a dark location or cover it with a black plastic container. The light level on the CDs cell should be at the darkness where you wish the DAS1 to turn on. []Turn RV2 clockwise until the LEDs turn on. []Remove the cover from the CDs cell, the LEDs should turn off. If you cover and uncover the CDs cell, the LEDs should turn on and off, the off light level is darker than the on light level due to the circuit's hysteresis action. []You may want to fine-tune the RV2 darkness turn-on setting at dusk after the DAS1 board has been mounted in a permanent location. That completes the alignment of the DAS1. DAS1 Board Mounting: The DAS1 should be permanently mounted in a metal or high temperature plastic box to prevent short circuits and the resulting fire hazard. If a standard 4"x4" electrical utility box is the used, the DAS1 can be mounted to the utility box cover plate with four 4-40 x 1/2" screws and 1/4" long spacers. Place the board so that the switch and LEDs protrude out of the utility box knock-out disks. Do not connect power to the DAS1 until it is screwed into the box and the box is screwed shut. Be sure to allow sufficient ventilation if the DAS1 is used at or near the full 10 amp current capacity. Cabling to the DAS1 should be securely clamped to the utility box or another solid structure. DAS1 Board Connection: Crimp-on spade lugs are the preferred way to terminate the DC supply and load wires. The minimum recommended wire gauge for 10 amp operation is #14, stranded wire is easier to work with than solid wire. The DAS1 can be permanently connected to a 12VDC power source such as a solar-charged lead acid, NiCd or NiMH battery or a 12V DC power supply. If the power source is a long distance from the DAS1, a 10 amp fuse should be put near the power source to protect the wire against shorts. If the CDs cell is remotely mounted from the DAS1 board, twisted pair wire can be used for up to 10 feet. For longer distances, use shielded twisted pair wire. The CDs cell should connect to the inside connectors, those should connect to the DAS1 2 pin connector. The shield wire should connect to the Load - line on the DAS1 4 pin connector, the remote end of the shield should be unconnected. The CDs cell should be pointed toward the outdoors so that it can detect the fall of night. Note that the CDs cell should be located so that it is not exposed to any light from the LEDs or the external lamps. If the CDs cell sees light from the DAS1, it will cause the lamps to flash on and off when darkness falls. The load lamps should be connected in parallel, a combination of 12V white LED lamps and automotive lamps may be used. The total lamp current should not exceed 10 amps. Be sure to use proper heat-radiating fixtures for incandescent lamps. DAS1 Board Operation: -Turn the switch to On and the white LEDs and external load lamps will light. -Turn the switch to Off and the white LEDs and external load lamps will turn off. -Turn the switch to Auto and the white LEDs and external load lamps will turn on when the CDs cell is dark.