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Technical Details –

Technical Details – Components for Discharge Lamps Determining operating/power reduction periods • The dial is set to the desired period of power reduction, e.g. to position 1 (0/0), which corresponds to a power-reduction period of six hours. • In the first night, the luminaire is activated by the twilight switch (e.g. at 20:30 hours) and will operate at its nominal rating. After four hours (default setting), the luminaire will be switched down by 40% of the lamp output by the power switch and will then remain in power-reduced operation until the twilight switch turns the system off (e.g. at 06:30 hours). • During this time, the power switch will measure the entire burning time of the lamp (10 hours in our example). • The power switch then compares the measured burning period with values stored on the microprocessor. The integrated comparative values of the power switch form the basis for the starting point of power-reduced operation for the following night. The "new" starting time will then be stored by the power switch until the following night. • In the second night, the lighting system – controlled by the twilight switch and thus dependent on the day/night cycle of the respective region and the time of year – will be activated (and deactivated) at a slightly different time as compared to the first night (either earlier or later, depending on the season) • With the dial set to position 1, the power switch will thus activate the six-hour period of powerreduced operation after two hours, as per our example, and will then revert to nominal operation before the twilight switch finally sends the signal to switch the lighting system off. • During the night, the power switch will again measure the entire burning time, compare this value with the stored values and then reset the starting time for power-reduced operation. • The period of power-reduced operation can be adjusted by changing the dial setting. This period can be extended in both directions (i.e. earlier or later) as detailed in the table on page 103. • If the dial is, for instance, set to 9 (1/2) this will produce a total period of power-reduced operation of 9 hours (1+6+2). As a result, power-reduced operation will begin one hour earlier than the value determined the night before would ordinarily prescribe and will then extend the minimum period of powerreduced operation by two hours. • If, in very rare cases, the total burning period of the lighting system should remain under six hours per night, the power switch will activate power-reduced operation after 15 minutes of nominal operation and stay in power-reduced mode until the lighting system is switched off. Switching diagram for power reduced operation. Switching diagram for power reduced operation Deactivating reduced-power operation for the night The functional scope of the PR 12 K LC power switch has been extended with an extra function that permits the operator to deactivate reduced-power operation of the lighting system for a single night. The function can be useful for local festivities or events (e.g. town fêtes) during which it would not be appropriate to operate the local street lighting system at reduced power for safety reasons. The power switch can be easily programmed to operate the lighting system at normal (i.e. 100%) power for the immediately following night cycle. The power switch is programmed by briefly switching the lighting system on for a period of min. 60 and max. 90 seconds during the day of the event and then switching it off again. The intelligent power switch recognises this command and sets the usual reduced-power operation to zero. The power switch can be successively programmed in this manner as many days in a row as necessary. For every night the lighting system is to be operated at normal (100%) power, the lighting system will have to be switched on for a period of min. 60 and max. 90 seconds during the day. The lighting system will be operated at normal (100%) power in the respective night following day-time activation of the extra function. 104

Technical Details – Components for Discharge Lamps The power switch does not need to be reprogrammed to return to power-reduced operation of the lighting system. The power switch will automatically return to its original (power-reducing) program if the lighting system is not switched on during the day for a period of min. 60 and max. 90 seconds. Before testing the extra function, it is important to ensure that the power switch has been in operation for at least one night cycle. Only then will the "learning cycle" start that is required to perform the basic function. After that, the extra function can be activated as described above. Luminaire testing The 'Test (Code 0)' dial setting on the power switch is used for luminaire testing during production as well as for direct function tests for "subsequent" installation in the lighting system. After the luminaire is switched on, the lamp is first operated at its nominal rating. After only five seconds, the system will be switched over to power-reduced operation, which will produce a visible change even though the lamp will not yet have attained its full output. Maintenance work on the lighting system Maintenance work that requires the lighting system to be switched on for a period of less than two hours will not influence the settings of power switch PR 12 K LC. Should the lighting system need to be switched on for more than two hours during maintenance work, the PR 12 K LC power switch will activate power-reduced operation after 15 minutes of nominal operation in the following night and will then start to re-measure the total burning time of the lighting system. To determine the starting time of power-reduced operation for subsequent nights, the power switch will again use the stored comparative values. Switch Units For power reduction using electronic ballasts with a 1–10 V interface Suitable for a broad range of lamps Vossloh-Schwabe's switch units are designed to enable one-step power reduction of lamps (FL, CFL, LED, HS, HI and C-HI) with the help of the respective electronic ballast or converter. To this end, the switch units utilises the 1–10 V interface of the control gear unit. The switch unit is mainly intended for outdoor luminaires in systems with or without a control phase. Discharge lamps may only be operated at reduced power if they have been expressly approved for this purpose by the manufacturer. In addition, the unit can also be used to dim tubular and compact fluorescent lamps as well as LEDs. The 1–10 V interface is addressed via an external circuit at the output of the switch unit using a suitably dimensioned resistor. The type of resistor and circuitry are selected by the luminaire manufacturer to suit the desired degree of power reduction. The switch unit satisfies the provisions of DIN EN 61347 and is suitable for use in outdoor luminaires of protection classes I and II. 1 2 3 4 5 6 7 8 9 10 105

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    2 Ballasts for Discharge Lamps For

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    Subsidiaries Subsidiaries Adress Ph