Murphy LCDT-8535B specifications Description, Features, Specifications

LCDT Selectronic® Tattletale® System

LCDT-8535B

Revised 07-06

Catalog Section 50

Description

The LCDT Selectronic Tattletale system is a compact fault annunciator with an electronic alarm/shutdown control system. It was designed to protect engine-driven or motor-driven compressors and pumps. The annunciator indicates the sensor, and hence the parameter, that causes an alarm or shutdown. In addition, a means is provided for testing the operation of each sensor without initiating an alarm or shutdown. Employing a liquid crystal display, the LCDT system gives a digital reading of the tripped sensor and the lockout timer countdown.

As the heart of the system, the basic annunciator component has two variations: the Model LCDT-NO, which accommodates normally open sensors, and the Model LCDT-NC, which accommodates normally closed sensors. These units are enclosed in an aluminum box having a brush finish. The LCDT system accommodates 47 sensor inputs, 15 of which may be locked out during start-up by the start/run timer delay.

A separate power supply is provided with the model LCDT instrument. Power may be supplied by CD ignition, a 120 VAC line, or by 12 or 24 VDC battery.

Intended for use with all Swichgage instruments without “OS” option.

Features

■System alarm or shutdown for up to 47 sensors.

■Timed start-up overrride for up to 15 sensors.

■Liquid Crystal Display of tripped sensors and the lockout timer countdown.

■Test timer for shutdown override during sensor test.

■Intrinsically safe annunciator unit; Class I, Division 1, Group D Hazardous Locations.

■Explosion-proof power supply.

■A battery maintains the electronics while the engine is not running.

■Optional 3-second time delay allows a fuel valve to close before grounding the ignition.

•Monitor Engine or Motor Driven Pumps and Compressors

•47 Normally Open (N.O.) or Normally Closed (N.C.) Sensor Inputs

•CSA* and Factory Mutual** Listed

•Rated for Hazardous Locations

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.

*When used with approved ignitionA. Contact Murphy for details.

** When installed per Murphy drawings HC-9450-A (50-08-0021) or HC-9450-AA (50-08-0019).

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