The Beghelli Central Test Emergency Lighting System (CT) is a centralised emergency lighting system with centrally controlled self testing emergency luminaires. CT performs the following functions:
• operational and full duration testing of the luminaires
• enabling or disabling the emergency function
• system control.
CT can control up to 1024 units, including the Maintained (SA) and Non Maintained (SE). An interface booster is required every 64 units, to amplify the data signals.
CONTROL UNIT ( C U )
A liquid cristal display (80 characters on 2 lines), a 24-column printer and a keyboard interface the operator with the CU. The display shows various selection menu to make easier the operator’s control, as well as the key to be pressed to start the various functions. A keyswitch located at the back of the keyboard can be used to prevent access by unauthorised persons. CT can be integrated into a centralised control system with a wider range of functions, or into a remote monitoring + control system via a telephone line. A two serial-line connectors (RS232) are located at the back of the CU. A sealed rechargeable 7,2V 1,2 Ah NiCd battery provides for 3 hours full duration in case of a power failure.
The CU is able to check when the first luminaires are connected into the system and report the number of luminaires as well as the list of their corresponding identification codes.
CONTROL MODULE ( C M )
Using the CM, all units in a CT system can be controlled from a PC. Beghelli supplies the appropriate software together with the CM.
DIN SERIAL INTERFACE
The connection between the Luminaires and Control Unit is achieved by means of an interface device that serves to amplify the signal and eliminate disturbance. The device can control up to 64 luminaires and occupies 6 DIN modules.
CT working is based on the interactive communication between the CU and each luminaire, carried out in a sequencial manner(polling) CU microprocessor sends messages on the data transmission line, recognised only by the appropriate codified luminaire. The unit microprocessor in the luminaire sends back a reply message, which is then analised by the CU. The CT controls not only the status of the units but the whole system as well. Any problems on the data line or main power line are immediately detected and a warning message is sent to the CU. The CT System is fail safe and should the CU fail luminaires, remain essentially autonomous. Cable or CM will also not affect emergency operation.
The CU runs the operational test automatically or following a specific demand. The operator can use the CU to program the time lag between two automatic tests as well as the test timing. During any test, the luminaire lights up for about one minute to verify the correct working of the fluorescent tube and the battery. CU collects and stores any failure and reports to the operator via display or a print out, stating test day and time and also the type of failure and identification number of the luminaires involved.
The multicolour ed LED located on the front of the luminaire facilitates identification of the defective unit and also indicates (See AT section) the luminaire status.
FULL DURATION TEST
The full duration test is run as the functionality test but is longer, because the state of the luminaires’ battery is checked by the unit microprocessor, collecting and storing any possible failure. Test results are shown on the display, and it is possible to print out test date and time, type of failure and identification number of the luminaires involved. The multicolour LED located on the front of the luminaire facilitates identification of the defective unit and also indicates (See AT section) the unit status. The operator can program automatic testing frequency between 1 and 99 weeks or can run tests on demand.