EDWAR 3-SDDC2CF: Dual Signature Circuit Control Card for Edwards EST3 Fire Alarm System

Product Overview

The EDWAR 3-SDDC2CF is a dual circuit intelligent drive control card specifically designed for the Edwards EST3 fire alarm control panel. This module, which includes an integrated filter, provides two independent Signature intelligent loops for connecting Signature series addressable detectors, manual call points, input output modules, and other addressable field devices. It is a core component of the EST3 system, delivering full digital bus management, automatic device addressing, and real time monitoring of loop integrity. The built in EMI RFI filter enhances stability in electrically noisy industrial environments, ensuring reliable operation even when installed in facilities with heavy machinery or variable frequency drives.

Key Features of EDWAR 3-SDDC2CF

The 3-SDDC2CF features two independent Signature loops, each supporting up to 250 intelligent addressable devices for a total capacity of 500 addresses per card. The module incorporates a 32 bit dedicated microprocessor that manages bidirectional digital communication with each field device. It supports distributed intelligence processing, where detectors and modules perform onboard signal analysis and transmit processed data rather than raw analog values. The card automatically discovers connected devices, assigns electronic addresses without manual DIP switches, and generates a physical topology map of the loop wiring, including T tap branches. Real time diagnostic functions detect missing devices, address conflicts, location changes, and wiring faults, providing detailed troubleshooting information to maintenance personnel.

Technical Specifications

• Manufacturer: Edwards (EDWAR)

• Part Number: 3-SDDC2CF

• Product Type: Dual Signature Intelligent Loop Control Card with filter

• Compatible System: Edwards EST3 fire alarm control panel

• Number of Loops: 2 independent Signature intelligent loops

• Capacity per Loop: 250 addressable devices

• Total Capacity per Card: 500 address points

• Operating Voltage: 24 V DC (backplane powered)

• Processor: 32 bit dedicated microprocessor

• Communication: Full digital bidirectional communication

• Alarm Response Time: Less than 0.75 seconds

• Physical Format: Standard EST3 slot module

• Terminals: Plugable field wiring terminals

• Filter: Integrated EMI RFI filter

Functional Description

The 3-SDDC2CF operates as the communication master for its two Signature loops, continuously polling all connected devices to update their status and detect alarm or fault conditions. Each device on the loop contains its own microprocessor that performs onboard analysis of sensor signals, making decisions based on algorithms downloaded from the control card. The control card maintains a database of device types, locations, and sensitivity settings, and can reconfigure devices remotely through the programming software. The module provides independent loop protection features including overcurrent protection, short circuit isolation, and ground fault detection. When a loop fault occurs, the Signature technology allows communication to continue with devices on either side of the break through loop isolation functionality.

Installation and Programming

The 3-SDDC2CF inserts into any available slot in the EST3 chassis and connects to the backplane for power and inter card communication. Field wiring for the Signature loops connects to pluggable terminals on the front of the card, simplifying installation and future maintenance. Programming is performed using Edwards EST3 programming software, which allows engineers to assign device types, configure input output relationships, and establish cause and effect logic. The software can automatically map the physical loop configuration, showing device locations and wire routing, which facilitates troubleshooting and system documentation. Up to five 3-SDDC2CF cards can be installed in a single EST3 controller, providing up to 10 total Signature loops and 2500 addressable points.

Applications

This dual circuit control card is widely used in commercial, industrial, and institutional fire alarm systems requiring addressable device technology. Typical installations include high rise office buildings, manufacturing facilities, hospitals, educational campuses, and data centers. The cards support for T tap wiring allows flexible loop layouts that accommodate existing conduit runs without requiring complete rewiring. The integrated filter makes the 3-SDDC2CF particularly suitable for installation in industrial environments where electromagnetic interference from welding equipment, large motors, or radio transmitters might otherwise disrupt fire alarm communications.