Edwards EST SIGA-CT1 Signature Single Input Module Unit

Module Feature

SIGA-CT1 is single-circuit intelligent addressable input module of Edwards EST Signature fire alarm series. It occupies one SLC loop address, no DIP switch, address assigned electronically via fire panel or SIGA-PRO service tool. It supports Class B supervised initiating device circuit, designed for normally open dry contact devices such as water flow switch, pressure switch, valve position feedback and supervisory contact. Operation function is defined by downloadable personality code: alarm latching / non-latching, supervisory monitoring mode optional. The circuit requires 47K EOL resistor for wiring fault supervision. Low standby current, compatible with EST3, EST3X fire host system. It mounts on standard 1-gang junction box, widely stocked as fire safety maintenance spare for factory, commercial building and petrochemical fire alarm cabinet.

Working principle

The module continuously monitors the resistance state of the contact loop. When field dry contact closes, module captures active signal and transmits event message with address to Signature SLC fire controller. It distinguishes normal status, alarm activation, open circuit and short circuit fault. Fault information is uploaded to fire alarm panel for display and record. Built-in microprocessor executes signal filtering to avoid false trigger caused by transient noise.

Onboard components

Loop communication transceiver, signal sampling circuit, microprocessor, 47K EOL supervision circuit, status LED indicators, terminal block and flame retardant plastic housing.

LED indicators

Green LED: flashing for normal standby status Red LED: flashing for alarm / active input status

Hardware self‑diagnosis

Built-in supervision detects IDC wire open, short circuit, EOL resistor missing, SLC communication loss and module hardware failure. Configuration and fault diagnosis are completed by Edwards fire panel configuration software or SIGA-PRO service tool.

Programming softwareSIGA-PRO / EST programming software, used for personality code download, address assignment, loop test and fault event log reading.

Electrical & Process Parameters

Model:SIGA-CT1 Brand:Edwards EST (UTC) Device type:Signature addressable single input monitor module Function:Supervised dry contact status acquisition for fire alarm and supervisory devices

Mechanical & Structure

Mounting:1-gang standard electrical box wall mounting Protection class:IP30 Housing:High impact engineering plastic

Environmental

Operating temperature:0℃ ~ +49℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non‑condensing

Certification:UL, ULC, FM, CE, meets NFPA72 Status:Original Edwards fire alarm spare

Installation

Power off SLC loop before replacement. Match correct 47KΩ end-of-line resistor, confirm NO contact wiring, download personality code from fire panel, test alarm trigger and wiring fault detection function after commissioning.

Interface

SLC signaling line terminals, IDC field contact monitoring terminals.

Diagnostic

Trouble fault: Wire open / short, missing EOL resistor. No alarm response: Wrong personality code, contact not closed, reversed wiring. Offline fault: SLC bus break, address duplicate, module damage.

Product Brief

SIGA-CT1 input module, Edwards EST Signature single-channel supervised contact monitoring spare for EST3/EST3X fire alarm control cabinet replacement.