Edwards SIGA-IM2 Assembly instructions

© 2020 Carrier 1 / 3 P/N 3102697-EN • REV 001 • ISS 24AUG20
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 
S
L
C

SLC 
S
L
C


2 / 3 P/N 3102697-EN • REV 001 • ISS 24AUG20
Application
For Class A pathways, install SIGA-IM2 modules to segment the SLC
as required (e.g., by zone or by number of devices) to prevent a wire-
to-wire short from taking down the entire circuit. See Figure 3 and
Figure 4.
For Class X pathways (see Figure 5):
• Install a SIGA-IM2 module 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), and wiring enclosed in conduit or equivalently protected
against mechanical injury.
• Install a SIGA-IM2 module on both sides of one or more standard
mount modules contained in a common enclosure.
• Install a SIGA-IM2 module on both sides of a single standard
mount module, in the same room, within 20 ft. (6.1 m), and wiring
enclosed in conduit or equivalently protected against mechanical
injury.
• Install a SIGA-IM2 module 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), and wiring enclosed in conduit or equivalently
protected against mechanical injury.
Figure 3: Typical Class A with isolated Class B branches
(1) Non-isolated devices effectively removed from the circuit
(2) Short circuit
(3) SLC Class B out
(4) SLC Class A return
Figure 4: Typical Class A with isolators
(1) Non-isolated devices effectively removed from the circuit
(2) Short circuit
(3) SLC Class B out
(4) SLC Class A return
Figure 5: Typical Class X
(1) Common enclosure
(2) Standard mount module
(3) UIO plug-in module
(4) Field wiring in the same room, within 20 ft. (6.1 m), and enclosed
in conduit or equivalently protected against mechanical injury
(5) Automatic fire detectors attached to isolator bases
(6) SLC Class B out
(7) SLC Class A return
SLC
A+ A-
SLC
B+ B-
(1)
(2)
(3) (4)
FACU
IM2
IM2
IM2
IM2
SLC
A+ A-
SLC
B+ B-
(1
)
(2)
(3) (4)
FACU
IM2
IM2 IM2
IM2
SLC
A+ A-
SLC
B+ B-
(6) (7)
FACU
IM2 IM2 (2)
(4)
(2)
(4)
(4) (4)
(3)
(1)
(1)
(5)
(5)
(2)
IM2 IM2
IM2 IM2IM2
IM2IM2 IM2

P/N 3102697-EN • REV 001 • ISS 24AUG20 3 / 3
Specifications
Operating voltage 15.20 to 19.95 VDC
Current
Standby
Active
170 µA
427.5 µA
Circuit resistance between
isolators
6 Ωmax.
Ground fault impedance 10 kΩ
Circuit designation
Signaling line circuit 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
Relative humidity
32 to 120°F (0 to 49°C)
0 to 93% noncondensing
Storage temperature range −4 to 140°F (−20 to 60°C)
Regulatory information
FCC compliance This device complies with part 15 of the FCC
Rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any
interference received, including interference that
may cause undesired operation.
Contact information
For contact information, see www.edwardsfiresafety.com.