Murphy LCDT-8535B User Manual

LCDT-8535B page 1 of 2

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.

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, 1/20HP,

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).

• 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

LCDT-8535B

Revised 07-06

Catalog Section 50

LCDT Selectronic®Tattletale®System

LCDT-8535B page 2 of 2

Module
Mounting
Hole

8 in.

(203 mm)

4-1/2 in.

(114 mm)

4-3/16 in.
(106 mm)

14 in. (356 mm)

clearance for conduit

9 in.

(229 mm)

3-1/4 in.
(83 mm)

10-1/4 in.
(260 mm)

5-15/16 in.

(151 mm)
10-5/8 in.
(270 mm)

8-5/8 in.

(219 mm)

15 in. (381 mm)

clearance for conduit

4-1/2 in.

(114 mm)

9 in.

(229 mm)

LCDT-PS-120/24/12

LCDT

How to Order

To order complete LCDT system, specify each component as follows:
(1) LCDT Module: Specify LCDT-

-NO: For normally open applications

-NC: For normally closed applications

(2) Terminal Strip and Cable Assembly: Specify LCDT-

-50CA-36: Normally open

-100CA-36: Normally closed

(3) Power Supply: Specify LCDT-

-PS-CD (R)-P: CD ignition positive ground

-PS-CD-N: CD one or two ignitions negative ground

-PS-120/24/12: Voltage: 120 AC, 12/24 DC

Shipping Dimensions:

LCDT-NO/NC module:

8-1/2x 9-1/2 x 5-1/2in. (216 x 241 x 140 mm).

LCDT-PS-CD-N and LCDT-PS-CD (R)-P:

4-1/2x 15-1/2 x 5-1/2in.

(114 x 394 x 140 mm).

LCDT-PS-120/24/12:

11-1/2x 18-1/4x 13-1/2in. (291 x 464 x

343 mm).

LCDT-50CA-36 or 100CA-36:

7-1/4x 12 x 5-1/2in.

(184 x 305 x 140 mm).

Shipping Weights:

LCDT-NO/NC Head:

5 lb. (2.2 kg.).

LCDT-PS-CD (R)-P:

9 lb. (4.08 kg.).

LCDT-PS-120/24/12:

21 lb. (9.5 kg.).

LCDT-50CA-36 or 100CA-36:

3 lb. (1.3 kg.).

LCDT System

The basic LCDT system consists of (1) the LCDT module,
(2) the terminal strip and cable assembly, and (3) the power supply.

LCDT Module–described on front page.
Terminal Strip and Cable Assembly

The plug-in type Terminal Strip has 50 screw-type connections for
normally open sensors and 100 connections for normally closed
sensors. The terminal strip can be connected to the LCDT module
with the 36 in. (914 mm) long flat ribbon cable.

Power Supply

You have a choice of input power supplies: LCDT-PS-CD (R)-P
and LCDT-PS-CD-N for CD ignition or LCDT-PS-120/24/12 for
120 VAC or 12 or 24 VDC. Each power supply includes control
Inputs/Outputs and an intrinsically safe barrier. They were
designed for Class I, Divisions 1 and 2, Group D Hazardous
Locations. FM and CSA listed.

LCDT-PS-CD(R)-P

LCDT-PS-CD-N

LCDT
Module

Power Supplies

Dimensions

Warranty

A limited warranty on materials and workmanship is given with this FW
Murphy product. A copy of the warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm

Printed in U.S.A. 04 7 554

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our
specifications and designs at any time. MURPHY, the Murphy logo, and Selectronic®Tattletale®. are registered
and/or common law trademarks of Murphy Industries, Inc. This document, including textual matter and
illustrations, is copyright protected by Murphy Industries, Inc., with all rights reserved. (c) 2006 Murphy
Industries, Inc.

www.fwmurphy.com

918.317.4100 Email: sales@fwmurphy .com

6-3/4 in.

(171 mm)

2-31/32 in.

(75 mm)

5-7/8 in.

(149 mm)

2-29/32 in.

(73 mm)

3/16 in. (5 mm)

dia. 3 places

6-1/8 in.

(156 mm)

6-1/16 in.
(154 mm)

6-9/16 in.
(167 mm)

3-1/32 in.

(77 mm)

3-1/8 in.
(79 mm)

3-3/32 in.
(79 mm)

1-7/8 in.
(48 mm)

3-1/2 in.
(89 mm)

clearance for plug

6-1/4 in.
(159 mm)