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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
/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).
• 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