Edwards SIGA-IM2 - User Manual

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SIGA-IM2 Isolator Module

Installation Sheet

Description

The SIGA-IM2 Isolator Module is an addressable device that protects a

signaling line circuit (SLC) from a wire-to-wire short. The SIGA-IM2

module monitors line voltages and opens the SLC when a short is

detected, effectively isolating the short between the two isolator

modules located electrically closest to the short.

The SIGA-IM2 module requires one detector address on the SLC.

Addresses are assigned electronically. There are no address switches.

An LED provides visible indication of the status of the module:

• Normal: Green LED flashes

Installation

Install this device in accordance with applicable national and local

codes, ordinances, and regulations.

• NFPA 72 2013 – A single fault on a pathway connected to the

addressable devices shall not cause the loss of more than 50

addressable devices.

• NFPA 72 2016 and later – A single fault on a pathway connected

to the addressable devices shall not cause the loss of the devices

in more than one zone.

Notes

• The module is shipped from the factory as an assembled unit; it

contains no user-serviceable parts and should not be

disassembled.

• This module does not operate without electrical power. As fires

frequently cause power interruption, discuss further safeguards

with your local fire protection specialist.

To install the module:

1. Write the address assigned to the module on the label provided,

and then apply the label to the module. Remove the serial number

label from the module, and then attach it to the project

documentation.

2. Wire the module as shown in Figure 2 on page 2.

3. Using the self-tapping screw provided, attach the wall plate to the

module. See Figure 1.

4. Using the four machine screws provided, attach the wall plate and

module to the electrical box.

Figure 1: Installation diagram

(1) Compatible electrical box

(2) SIGA-IM2 module

(3) Wall plate

(4) #6-32 × 5/8 machine screws (4X)

(5) #4 × 1/2 self-tapping screw

Wiring

Wire this device in accordance with applicable national and local

codes, ordinances, and regulations.

Notes

• Refer to the Signature loop controller installation sheet for SLC

wiring specifications for additional details.

• All wiring is power-limited and supervised.

To wire the module:

1. Verify that all field wiring is free of opens, shorts, and ground

faults.

2. Strip 1/4 in. (about 6 mm) from the ends of all wires that connect to

the terminal block of the module.

When stripping wire ends, exposing more wire may cause a

ground fault; exposing less wire may result in a faulty connection.

3. Make all wiring connections as shown in Figure 2.

Figure 2: Wiring diagram

(1)

(2)

(3)

(4)

(5)

SLC





SLC





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Summary

Module Description and Status

Module Description

Explains the SIGA-IM2 Isolator Module's function in protecting a signaling line circuit from wire-to-wire shorts.

LED Status Indication

Details the visible indication of the module's status via a green LED, which flashes during normal operation.

Installation and Wiring Procedures

Installation Guidelines

Covers installing the device according to codes, NFPA standards, and notes regarding module handling and power.

Wiring Instructions

Provides instructions for wiring the device, emphasizing adherence to codes and proper wire stripping.

Application Examples

Class A Pathways

Illustrates how to segment SLCs in Class A pathways to prevent shorts from affecting the entire circuit.

Class X Pathways

Details the installation of SIGA-IM2 modules in Class X pathways, including common enclosures and standard modules.

Specifications and Regulatory Information

Technical Specifications

Lists operating voltage, current, resistance, circuit designation, wire size, and environmental operating ranges.

Regulatory Compliance

States compliance with FCC Rules, outlining conditions for operation regarding harmful interference.

Summary

Module Description and Status

Module Description

Explains the SIGA-IM2 Isolator Module's function in protecting a signaling line circuit from wire-to-wire shorts.

LED Status Indication

Details the visible indication of the module's status via a green LED, which flashes during normal operation.

Installation and Wiring Procedures

Installation Guidelines

Covers installing the device according to codes, NFPA standards, and notes regarding module handling and power.

Wiring Instructions

Provides instructions for wiring the device, emphasizing adherence to codes and proper wire stripping.

Application Examples

Class A Pathways

Illustrates how to segment SLCs in Class A pathways to prevent shorts from affecting the entire circuit.

Class X Pathways

Details the installation of SIGA-IM2 modules in Class X pathways, including common enclosures and standard modules.

Specifications and Regulatory Information

Technical Specifications

Lists operating voltage, current, resistance, circuit designation, wire size, and environmental operating ranges.

Regulatory Compliance

States compliance with FCC Rules, outlining conditions for operation regarding harmful interference.

The SIGA-IM2 Isolator Module is an addressable device designed to protect a signaling line circuit (SLC) from wire-to-wire shorts. It continuously monitors line voltages and, upon detecting a short, opens the SLC to isolate the short between the two electrically closest isolator modules. This effectively prevents a single short from disabling the entire circuit.

Function Description:

The module operates by monitoring the SLC for short circuits. When a short is detected, it automatically isolates the affected segment, ensuring that the rest of the SLC remains operational. This isolation capability is crucial for maintaining system integrity in fire alarm applications. The SIGA-IM2 requires one detector address on the SLC, which is assigned electronically without the need for physical address switches. An LED indicator provides visual feedback on the module's status: a green LED flashes during normal operation.

Important Technical Specifications:

Operating Voltage: 15.20 to 19.95 VDC
Current:
- Standby: 170 µA
- Active: 427.5 µA
Circuit Resistance between Isolators: 6 Ω max.
Ground Fault Impedance: 10 KΩ
Circuit Designation: Class A, Class X
Wire Size: 12 to 18 AWG (1.0 to 4.0 mm²)
Compatible Electrical Boxes:
- 2-1/2 in. (64 mm) deep double-gang box
- 4 in. square box, 1-1/2 in. (38 mm) deep with double-gang cover
Operating Environment:
- Temperature: 32 to 120°F (0 to 49°C)
- Relative Humidity: 0 to 93% noncondensing
Storage Temperature Range: -4 to 140°F (-20 to 60°C)

Usage Features:

The SIGA-IM2 module is designed for easy installation and integration into fire alarm systems. It is shipped as an assembled unit, with no user-serviceable parts, and should not be disassembled. Installation must comply with applicable national and local codes, ordinances, and regulations, including NFPA 72 standards.

For Class A pathways, SIGA-IM2 modules are installed to segment the SLC by zone or number of devices, preventing a wire-to-wire short from taking down the entire circuit. For Class X pathways, the module can be installed in several configurations:

On the Class B out and Class A return wiring inside the control unit, or in the same room within 20 ft. (6.1 m), with wiring enclosed in conduit or equivalently protected against mechanical injury.
On both sides of one or more standard mount modules contained in a common enclosure.
On both sides of a single standard mount module, in the same room within 20 ft. (6.1 m), with wiring enclosed in conduit or equivalently protected against mechanical injury.
On both sides of a common enclosure containing one or more UIO plug-in modules, in the same room within 20 ft. (6.1 m), with wiring enclosed in conduit or equivalently protected against mechanical injury.

Wiring involves stripping 1/4 inch (about 6 mm) from the ends of all wires connecting to the terminal block. Care must be taken to avoid exposing too much or too little wire, as this can lead to ground faults or faulty connections. All wiring is power-limited and supervised. The module is attached to a wall plate using a self-tapping screw, and then the wall plate and module are secured to an electrical box using four machine screws.

Maintenance Features:

The SIGA-IM2 module does not contain user-serviceable parts and should not be disassembled. It requires electrical power to operate, and users are advised to discuss further safeguards with their local fire protection specialist, particularly concerning potential power interruptions during fires. Prior to wiring, it is essential to verify that all field wiring is free of opens, shorts, and ground faults to ensure proper operation and prevent system issues. For detailed SLC wiring specifications, users should refer to the Signature loop controller installation sheet. The device complies with part 15 of the FCC Rules, ensuring it does not cause harmful interference and accepts any interference received.