T57-5 System DISTRIBUTED DIMMING NETWORKTunnel Lighting Control SystemT57-5 system is design as a Contactor Based or a Distributed Dimming Network. SCOPE APPLICATIONStructureUnidirectionalBidirectionalLong tunnelInside the T51-3 System NEMA 3R, 4X or 12 enclosure.(Pre-wired and tested to UL508A (CAN/CSA C22.2.0014-M91)Major ComponentsNote: Incoming power of 120 VAC, additional Transformer 480/277 VAC.Normally closed electrically held relayPower distributionFusesNormally closed contactorMain controller: T57Twelve output channels for night and two daytime light levels.Hold-On timer, (0-160 min)Output channelAdjustable ascending input time delay (0-99 min)Adjustable descending input time delay (0-99 min)Hold-On timers, (0-240 min)Hold-Off timers, (0-99 min) Optional programming sequenceAlternation of lightsNight/Day crossoverInput into the T57 controllerMAS sensorTMAS sensorTLUM sensorReceives 4-20mA signal.Adjustable deadband.