DALI manual - Tridonic

.cMaintenance and troubleshootingMaintenance and troubleshootingFailure of a DALI ballastDALI 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 DALI ballasts. If a ballast fails, these parameters must be reset inthe replacement ballast. DALI 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 DALI short address is automatically assigned to the new DALI 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 DALIcircuitThere are certain points that deserve special attention when designing a DALI application. These include the limit onthe current in the DALI circuit and the limit on the cable length due to the maximum permissible voltage drop on theDALI line.What happens if these limits are exceeded?The system does not then behave as it should and some strange phenomena occur.For example:DALI devices react to broadcast commands but cannot be found during addressingNot all the DALI devices connected to the DALI circuit are found.Different numbers of devices are found at successive addressing processes.The devices do not react reliably to DALI commands.The commonest problems in a DALI installation result from the maximum voltage drop in the circuit being exceededand from a short-circuit somewhere on the DALI line. But how is the voltage drop in the DALI circuit measured?...DALI Manual | 08-2013 | en82 / 93