3RH, 3TX, LZX coupling links
SIRIUS System Manual
GWA 4NEB 430 0999-02b
6-5
6.2.2 Coupling links in two-tier and box terminal format
Features
• Connections at two levels
• Very narrow design, as of 6.2 mm
• Terminal system: screw-type and Cage Clamp
• Labeling strip to identify equipment
Models
The 3TX70 coupling links for SIRIUS are available as both input couplers and
output couplers, which have their terminals in different positions:
Figure 6-1: Output couplerInput coupler
Input coupling links have hard gold-plated contacts for greater contact reli-
ability at low voltages and currents.
Status indication
A yellow status LED on the drive circuit side indicates whether there is any
control supply voltage applied to the coupler.
Protective circuit
There is an integrated rectifier at the input of each coupler. As a result, they
are protected against polarity reversal. The rectifiers function as flywheeling
diodes at disconnection. Semiconductor outputs are protected by suppres-
sor or Zener diodes.
Manual-0-automatic
Some coupling links are equipped with a manual-0-automatic switch that
makes it easier to switch the system on and is used for test purposes.
• Manual: Relay is always on
• O (zero): Relay is always off
• Automatic: Relay follows the control supply voltage
Power consumption
Following on from the technical specifications of the electronic systems, the
coupling links have low power consumption. They can be controlled from a
programmable controller and are suitable for continuous duty.
Accessories
The following accessories are available for two-tier coupling links:
• 24-pole connecting lead or connection comb
• Screwdriver for Cage Clamp terminal system
• End holder and end plate
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