RDL ST-LCR3 Logic-Controlled Relay (Dual Alternate Pulse) with Power Supply.
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 +5 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 +5 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. LED indicators show when the
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 individually, or combine it with other RDL products as part of a complete audio/video
system.