Installation Instructions - Clipsal

Intelligent Building SeriesC-Bus 12 Channel Professional Architectural Dimmer Installation Instructions8.0 Fault Diagnosis8.1 ProtectionC-Bus 12 Channel Professional Architectural Dimmers feature several types ofprotection. These can generally be classified as:• Output protection• Thermal protection• Over voltage protection• Over and under frequency protection• Soft Start8.1.1 Output ProtectionEach of the twelve output circuits is protected by a fast-acting thermalmagnetic circuit breaker. These breakers are designed to pass the ratedcurrent, but will disconnect the output circuit for any overload condition(the larger the overload, the quicker the disconnection).The breakers protect the dimmers output devices from short-circuit loadsand faulty wiring looms, and save on expensive dimmer repairs. A trippedcircuit breaker indicates a load fault that requires immediate attention.8.1.2 Thermal ProtectionThe C-Bus 12 Channel Professional Architectural Dimmers featuretemperature-controlled fan cooling. As the internal temperature of thedimmer increases, the fan starts to operate. The fan operates attemperatures above 50 o C.8.1.3 Supply Power Fault ProtectionThe C-Bus 12 Channel Professional Architectural Dimmers electroniccircuits will tolerate significant over-voltages and accidentally transposedactive-neutral connection with no internal or output load damage.8.1.4 Over and Under Frequency ProtectionThe C-Bus 12 Channel Professional Architectural Dimmers constantlymonitor the mains frequency. If the mains frequency falls below 40Hz orabove 80Hz the unit will isolate all 12 output channels until the mainsfrequency returns to within range.8.1.5 Soft StartWhen a channel is first turned on to a level greater than 50% the voltageis limited for the first 5 mains half cycles (at 50Hz this is a duration of 0.05seconds). This allows the bulb filament to warm up, minimizing nuisancecircuit breaker tripping. Soft start is applied to a channel after it has beenat a level of 0% for a period greater than 1.5 seconds. This allows thechannel to be flashed on and off repeatedly, but have it soft start onlyonce.© Copyright 2003 Clipsal Integrated Systems Pty Ltd. Page 23