Prefect Control PRE3206 Installation Instructions

Tel: 01787 320 604 Fax: 0845 450 3020 Email: [email protected] Website: www.prefectcontrols.com Due to our policy of continuous improvement, we reserve the right to change specifications without notice PRE3206 IP66 Photocell Specification: SUPPLY VOLTAGE: 220-240 Volts AC 50 Hz TIME OUT PERIOD: Adjustable 1 hour to 16 hours or AUTO OFF. LIGHT LEVEL: Adjustment 10 LUX to1000 LUX approximately. TERMINAL CAPACITY: 2.5mm2 IP RATING: IP 66 MATERIAL: Polystyrene TYPE: Class 2 TEMPERATURE: -10°C to 35°C CONFORMITY: EMC-89/336/EEC Operation: The PRE3206 twilight switch will turn artificial lighting on when the ambient light falls below a preset level. The artificial lighting will then be turned off either when the ambient light exceeds the preset level (auto off) or after a preset time delay (timed off). For example, in the auto off mode the PRE3206 can be used to switch external security lights on at dusk and automatically switch them off again at dawn. In the timed off mode display or sign lighting can be set to turn on when it gets dark and stay on only for a set time period. An integral 2 minute time delay prevents nuisance switching caused by, for example, car headlights or dark clouds. The unit has a highly accurate adjustable photocell; a selectable time delay; adjustable switching differential and is mounted in a vandal resistant IP66 enclosure. 1. Make sure the load is connected and in working order. 2. Isolate the mains supply to the circuit at the main consumer unit. 3. Connect the controller via the terminal block. Live supply to the L terminal, Neutral to the N terminal. 4. For direct switching applications link L to COM and take the output from the NO terminal. 5. Set the TIME thumbwheel to AUTO OFF by turning fully anticlockwise 6. Set the LUX thumbwheel to LATE by turning fully clockwise. 7. Set the DIFF (differential) thumbwheel half way. 8. Power the unit up. 9. The lights will not come on until the ambient light level is very low. 10. Adjust the LUX level and differential using the guide overleaf. 11. Finally set the TIME thumbwheel to AUTO OFF or the desired time setting. WARNING! This device works at mains potential. Be sure to take care when working with electricity. Installation Instructions: 79 95 95 79 39 15

Tel: 01787 320 604 Fax: 0845 450 3020 Email: [email protected] Website: www.prefectcontrols.com Due to our policy of continuous improvement, we reserve the right to change specifications without notice Wire the PRE3206 product as in the diagram. The unit has a voltage free changeover output which can be used to switch, say, a BMS or lighting control system as well as switching a load directly. To switch a load directly link the L and COM terminals and take the output from the NO terminal. •� Where�possible�site�the�sensor�as�high�as�possible�on�a�north� facing vertical surface •� Avoid�locating�the�PRE3206�in�direct�sight�of�the�light�that�it� is controlling. •� Ensure�that�all�cable�entry�to�the�enclosure�is�via�suitable� cable glands and seal with silicone sealant where appropriate. •� If�it�is�necessary�to�screw�through�the�rear�of�the�enclosure� ensure that any holes are covered with the caps provided and sealed with silicone sealant where appropriate. ADJUSTING THE LUX LEVEL 1. The best time to set the LUX level is when the unit is just required to turn on. 2. Leave the TIME and DIFF thumbwheels set as above. 3. Turn the LUX thumbwheel very slowly anticlockwise towards the EARLY position until the lights come on. 4. There is a 2 minute time delay to prevent nuisance switching. This is automatically disabled whenever the LUX thumbwheel is turned, and then re-instated automatically after a further 2 minutes. 5. Turning the LUX thumbwheel to EARLY switches the unit earlier in the day, i.e. when ambient conditions are lighter. Turning to LATE switches the unit later in the day, i.e. when ambient conditions are darker. ADJUSTING THE DIFFERENTIAL 1. After the unit has turned on, the differential is used to determine at what level of measured light to switch off again. It is only relevant in AUTO OFF mode. 2. If the differential is set to minimum the unit will turn off when the measured light is only a tiny bit greater than the level at which it turned on. 3. If the differential is set to maximum the unit will turn off then the measured light is much greater than the level at which it turned on. 4. If, say, the unit is set to turn on at dusk, set the differential lower (anticlockwise) if you want the lights to turn off again early in the morning and set the differential higher (clockwise) if you want the lights to turn off again when it is much lighter. 5. The differential is also useful if the unit can see the lights which it is controlling. In this case increasing the differential will prevent cycling of the lights. Installation Instructions: Wiring: LUX ADJUSTMENT LIVE IN NEUTRAL CIRCUIT PROTECTION (IF REQUIRED) L N DIFF TIME LUX COM NC NO TIMING ADJUSTMENT DIFFERENTIAL ADJUSTMENT EARLY LATE LUX AUTO OFF 16 HRS TIME 1 HR TIMED OFF MIN MAX DIFF Thumbwheel Settings