T51-3 System


Tunnel Lighting Control System
T51-3 system is an industrial microprocessor contactor based lighting control panel.

  • 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 interposing relay
  • Power distribution
  • Fuses
  • Normally closed contactor
  • Main controller: T51
    Six output channels for night and two daytime light levels.
    Hold-On timer, (0-160 min)
Output channel
  • Adjustable 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 sequence
  • Alternation of lights.
  • Night/Day crossover
Input into the T51 controller
  • TMAS sensor
  • TLUM sensor
  • Receives 4-20mA signal.
  • Adjustable deadband.
Type of Tunnel light sources
  • Fluorescent (FL)
  • Low Pressure Sodium (LPS)
  • High Pressure Sodium (HPS)
  • Metal Halide (MH)
  • Light emitting diode (LED)