Murphy Network Card LCDT 8535B User Manual

LCDT-8535B  
Revised 07-06  
Catalog Section 50  
LCDT Selectronic® Tattletale® System  
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  
Description  
Specifications  
The LCDT Selectronic Tattletale system is a compact fault Power: Supplied by CD ignition of an engine, 120 VAC line, or  
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.  
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.  
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.  
LCDT-PS-120/24/12 Contact Rating: 5A, 28 VDC.  
120 VAC (resistive).  
Intended for use with all Swichgage instruments without  
“OS” option.  
FET Outputs: LCDT-PS-CD-N rating (for fuel valve and  
ignition ground): 0.5A @ 250 V.  
Features  
Alarm Relay Contact Rating: 4A, 1/20 HP, 125/250 VAC/3A, 30 VDC.  
System alarm or shutdown for up to 47 sensors.  
Timed start-up overrride for up to 15 sensors.  
Operating Temperature: Module (head): -40 to 185°F (-40 to 85°C).  
Power Supply: 0 to 158°F (-18 to 70°C)  
Liquid Crystal Display of tripped sensors and the lockout timer  
Storage Temperature: -40 to 302°F (-40 to 150°C).  
countdown.  
Case: LCDT-NO/NC (module): anodized aluminum.  
Test timer for shutdown override during sensor test.  
Power Supply (all models): Explosion-proof aluminum.  
Intrinsically safe annunciator unit; Class I, Division 1, Group D  
Multiplexer Scan Rate: Scans all 47 sensors in 0.7 sec.  
Hazardous Locations.  
Start-Run/Test Timer: Standard 5 minutes, specify other, up to  
Explosion-proof power supply.  
7 minutes maximum (in 1 minute increments).  
A battery maintains the electronics while the engine is  
*
**  
Laboratory Approvals: CSA and Factory Mutual System Listed  
not running.  
for Class I, Division 1, Group D, Hazardous Locations.  
Optional 3-second time delay allows a fuel valve to close  
*
before grounding the ignition.  
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).  
LCDT-8535B page 1 of 2  
 

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