Murphy LCDT Series Compressor Controls

  • Specifications


    Power: Supplied by CD ignition of an engine, 120 VAC line, or by 12 or 24 VDC battery.

    Power Inputs (Operating Voltage):
    LCDT-PS-CD (R)-P: 90-250 VDC, CD ignition, positive ground.
    LCDT-PS-CD-N: 90-250 VDC CD ignition, negative ground.
    LCDT-PS-120/24/12: 120 VAC (6 VA), 24 VDC (1 watt), 12 VDC (0.5 watts).

    Sensor Inputs: Accepts up to 47 sensors (NC version only 45) via a ribbon cable. The LCDT system was designed to be used with sensor switches having normally open or normally closed contacts such as Murphy Swichgage instrument. NOTE: An approved isolation barrier such as a thermocouple type barrier, must be used between sensor switch and input terminals if sensor outputs come from any energy storing device such as a relay or transistor.

    Relay Outputs Ratings:
    LCDT-PS-CD (R)-P Contact rating: 4A, 1/20 HP, 125/250 VAC/3A, 30 VDC.
    LCDT-PS-120/24/12 Contact Rating: 5A, 28 VDC. 120 VAC (resistive).

    FET Outputs: LCDT-PS-CD-N rating (for fuel valve and ignition ground): 0.5A @ 250 V.

    Alarm Relay Contact Rating: 4A, 1/20 HP, 125/250 VAC/3A, 30 VDC.

    Operating Temperature: Module (head): -40 to 185°F (-40 to 85°C).

    Power Supply: 0 to 158°F (-18 to 70°C)

    Storage Temperature: -40 to 302°F (-40 to 150°C).

    Case: LCDT-NO/NC (module): anodized aluminum.

    Power Supply (all models): Explosion-proof aluminum.

    Multiplexer Scan Rate: Scans all 47 sensors in 0.7 sec.

    Start-Run/Test Timer: Standard 5 minutes, specify other, up to 7 minutes maximum (in 1 minute increments).

    Laboratory Approvals: CSA* and Factory Mutual System** Listed for Class I, Division 1, Group D, Hazardous Locations.

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FW Murphy Service Network

Palmer Johnson's six-location factory-authorized service center network features:

  • Factory-trained technicians
  • Field service
  • Onsite troubleshooting and diagnostics
  • Unit removal and installation

For FW Murphy service, call 1-800-341-4334.

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