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.cMaintenance and troubleshootingMaintenance and troubleshootingFailure of a <strong>DALI</strong> ballast<strong>DALI</strong> is based to a large extent on distributed intelligence, which means that the addresses and parameters such asgroup assignment and scene values are stored in the <strong>DALI</strong> ballasts. If a ballast fails, these parameters must be reset inthe replacement ballast. <strong>DALI</strong> ballasts straight from the factory are not programmed with any addresses, groupassignments or scene values.The simplest option is to use masterCONFIGURATOR:Replace the faulty ballast with a new ballastAddress the ballast with the function “System expansion” or “Only address new (not yet addressed) devices”.The lowest free <strong>DALI</strong> short address is automatically assigned to the new <strong>DALI</strong> ballast. Since there is an addressmissing in the circuit (that of the faulty ballast), it is automatically given the address of the old ballast. If severaldevices are faulty their replacements are randomly assigned the free addresses.Reprogram the group assignments and scene values.Exceeding the maximum cable length or short-circuits in the <strong>DALI</strong>circuitThere are certain points that deserve special attention when designing a <strong>DALI</strong> application. These include the limit onthe current in the <strong>DALI</strong> circuit and the limit on the cable length due to the maximum permissible voltage drop on the<strong>DALI</strong> line.What happens if these limits are exceeded?The system does not then behave as it should and some strange phenomena occur.For example:<strong>DALI</strong> devices react to broadcast commands but cannot be found during addressingNot all the <strong>DALI</strong> devices connected to the <strong>DALI</strong> circuit are found.Different numbers of devices are found at successive addressing processes.The devices do not react reliably to <strong>DALI</strong> commands.The commonest problems in a <strong>DALI</strong> installation result from the maximum voltage drop in the circuit being exceededand from a short-circuit somewhere on the <strong>DALI</strong> line. But how is the voltage drop in the <strong>DALI</strong> circuit measured?...<strong>DALI</strong> Manual | 08-2013 | en82 / 93