RDL STLCR3 Installation Guide

STICK-ON® SERIES

Model ST-LCR3
Alternate Pulse Dual Relays

ANYWHERE YOU NEED...

•

Pulse at the Start of a Logic Signal

•

Pulse at the End of a Logic Signal

•

Relay Contact and Open-Collector Pulse

•

Active High or Active Low Inputs

•

Input Control Voltage From 3.3 to 24 Vdc

•

Control from Switch, Pushbutton, or Logic
Circuits

You Need The ST-LCR3!

The ST-LCR3 Alternate Pulse Dual Relays are part of the group of products in the STICK-ON series by
Radio Design Labs. These products are designed for quick, convenient installation, and reliable operation
with a variety of control input options.

APPLICATION: The ST-LCR3 is ideally suited to applications where momentary pulses are needed from a
single control signal. The module provides a momentary pulse when a logic signal at its input first
becomes active. A separate momentary pulse is provided when the logic signal at the module input
becomes inactive.

Two logic inputs are available on the ST-LCR3. Either of these inputs may be used. Terminal 1 is
internally pulled high to +5 Vdc. This input becomes active when an external closure or open-collector
pulls the terminal to ground. The external switching device does not need to pull the terminal high,
however the terminal may be pulled high with any voltage from +3.3 Vdc to +24 Vdc without any risk of
damage to the ST-LCR3 input. Terminal 3 is internally pulled to ground. This input becomes active when
an external closure or logic device applies a positive voltage from +3.3 Vdc to + 24 Vdc.

When the input being used first becomes active the START PULSE output from the module is triggered.
When the input first becomes inactive (after first being active) the END PULSE output from the module is
triggered. Both the start and end pulses have a nominal duration of 250 ms.

start and end pulses are active.

Each pulse output provides both an open-collector SLAVE terminal and relay contacts. The SLAVE
terminal may be used to control other RDL modules and a variety of other equipment. The relay contacts
may be used to control modules or equipment that do not operate from open-collector control.

The module operates from a ground-referenced 24 Vdc power supply.
The wide range of input voltages allows the ST-LCR3 to be controlled from a variety of modules,

equipment or switches. The ST-LCR3 is ideal in most applications requiring a control pulse at the
beginning of a switched signal, at the end of a switched signal, or at both the beginning and end of a
switched control signal.

Use the ST-LCR3 with other RDL RACK-UP
a complete audio/video system.

LED indicators show when the

®

, STICK-ON, TX™, or FLAT-PAK™ series products as part of

RDL • 659 N. 6th St. • Prescott, AZ., USA 86301 • [phone] • FAX [phone] • www.rdlnet.com

STICK-ON® SERIES

Model ST-LCR3
Alternate Pulse Dual Relays

+3.3 Vdc

OR

LOGIC

DRIVER

OPEN COLLECTOR
CONTROL SIGNAL
CONNECTION

ADDING ADDITIONAL CONTACTS

OR

TYPICAL MODULE ACTUATION

NOTE ACTUATION
VOLTAGE CAN BE

3.3 Vdc TO 24 Vdc

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

ALTERNAT

START

S

PULSE

ACTUATE

DO NOT
CONNECT
SLAVE TO

!

POWER +

OPEN COLLECTOR
ACTUATION, EMITTER
CAN BE GROUNDED

DIRECT RELAY ACTUATION

TERM 1 INPUT

L
A
V
E

ERNATE PULSE DUAL RELAYS

START

S

PULSE

L
A
V

END

S

PULSE

L
A
V
EE

PWR

LOGIC CONTROLLED RELAY

ACTUATE

S

PWR

L
A
V
E

5

24

V

V

TERM 3 INPUT

SHOWN DE-ENERGISED

START PULSE

END PULSE

DPDT CONTACTS
ENERGIZED DURING
ST-LCR3 START PULSE

MASTER

24 Vdc

POWER

SOURCE

UP TO

4 MORE

UNITS

(USE IDENTICAL CONNEC­TIONS FOR END PULSE)

SLAVE

250 mS NOMINAL

TIMING

TYPICAL PERFORMANCE

Inputs (2): Logic High or Logic Low (Low = ground, High = 3.3 Vdc to 24 Vdc)
Outputs (2): Open collector @ 25 mA suitable to drive indicators or slave LCRs.
Indicators (2): Pulse active LEDs
Relay Contacts: Double-Pole, Double-Throw

Maximum Switching Power: 60 W (220 Vdc, 125 Vac, 2 A)
Power Requirement: 24 to 33 Vdc @ 100 mA, Ground-referenced

891-1120C

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