2.9.9 Wiring an Isolator Module (ISO-X). Notifier AFP-200

Wiring a Signaling Line Circuit (SLC)

Installation

Style 7 Wiring Overview

Figure 29 shows typical wiring of a four-wire SLC that meet NFPA Style 7 requirements. As shown in Figure 29, flanking each SLC device with a pair of ISO-X isolator modules protects each device from short circuit faults that may occur on other

SLC devices. For example, a fault on zone 2 will not affect zones 1 and 3. ISO-X modules on either side of zone 2 will open the SLC. Zone 1 will still operate from power on loop out and zone 3 will operate from SLC return. Because the control panel cannot communicate with zone 2, a trouble signal(s) will be generated for that device.

Note: Do not T-Tap or branch a Style 7 four-wire SLC. Ratings and characteristics are identical to a NFPA Style 6 four-wire SLC.

Note: Locate ISO-X module near detector.

Enclose wiring between detector and ISO-X in conduit.

Addressable Manual

Pull Station (flanked by

ISO-X modules)

Note: All wiring between a manual pull station and ISO-X modules should be enclosed in conduit.

Note: If a non ISO base is used, install ISO-X modules on both sides of devices within 20 feet

(6.096 m) in rigid conduit.

ISO-X

1

3

2

2

3 4

ISO-X

1

2

_

3 4

ISO-X

1

2

+

Addressable

Detector

(Zone 1)

1

3

4

Two-wire Isolator

Detector Base

(Zone 2)

SLC Out

2

1

ISO-X

4

3

Addressable

Pull Station

(Zone 3)

+

2

1

ISO-X

4

3

_

SLC Return

Control Panel

1

A

2

3

4 5 6

B B+ A+ B- A-

CPU

Connect SLC Out to

TB 6-3 (+) and TB 6-5 (–).

Connect SLC Return to

TB 6-4 (+) and TB 6-6 (–).

Figure 29 Four-wire SLC (Style 7)

2.9.9 Wiring an Isolator Module (ISO-X)

ISO-X Module Overview

You can connect a maximum of 25 devices between isolator modules. During a fault condition, the control panel registers a trouble condition for each addressable device which is isolated on the SLC segment or branch.

Refer to 2.9.6 “Setting an SLC Address for a Module” for instructions on addressing the modules.

AFP-200 PN 15511:H2 10/14/2002

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