T57-4 System


Tunnel Lighting Control System
T57-4 system sends 4-20mA signal to Remote Dimmer Enclosures (RDE) to control the dimming driver for LED fixtures.

  • Unidirectional
  • Bidirectional
  • Long tunnel
Inside the T51-3 System NEMA 3R, 4X or 12 enclosure.
(Pre-wired and tested to UL508A (CAN/CSA C22.2.0014-M91)

Major Components

Note:  Incoming power of 120 VAC, additional Transformer 480/277 VAC.

  • Normally closed electrically held relay
  • Power distribution
  • Fuses
  • Normally closed contactor
  • Main controller: T57
    Twelve output channels for night and two daytime light levels.
    Hold-On timer, (0-160 min)
Output channel
  • Hi/Low Voltage Trim, (0-100)
  • Hi/Low Output Trim, (0-100%)
  • Hi/Low Setpoint Value, 0-xx Footcandle (Cd/m2)
  • Fade/Rise Time, 0-60 seconds
 Optional programming sequence
  • Alternation of lights
  • Night/Day crossover
Input into the T57 controller
  • MAS sensor
  • TMAS sensor
  • TLUM sensor
  • Receives 4-20mA signal.
  • Adjustable deadband.