Bosch FLM-I User Manual

Fire Alarm Systems | FLM‑I 420‑S Short Circuit Isolator

b1+ a- b2+ N/A N/A N/A

LSN

9 1

6 4

7 3

8 2

6 4

9 1

7 3

CL 1

FLM‑I 420‑S Short Circuit Isolator

Rotary switch for automatic and manual address

▶

setting

Preservation of LSN loop functions in the event of a

▶

short-circuit by two integrated isolators

Power supply via LSN

▶

Three free screw terminals

▶

The Short Circuit Isolator isolates alarm zones in which a short circuit has occurred. This means the functionality of the remainder of the network remains preserved.

System Overview

Description Connector

b1+ / a- / b2+ LSN

N/A (3 x) free terminals, e.g. for looping through ext. auxiliary volt-

age and for shielding

Functions

Features of improved LSN

The interface modules in the 420 series offer all the features of improved LSN technology:

Flexible network structures including T‑tapping

•

without additional elements Up to 254 LSN-improved elements per loop or stub

•

line Unshielded cable can be used

•

Address switch (rotary switch)

The address of the Short Circuit Isolator is set using the rotary switches.

The following settings are possible:

0 0 0 Loop/stub in LSN mode improved version with automatic

addressing (T-tap system not possible)

0 0 1 - 254 Loop/stub/T-tap system in LSN mode improved version

with manual addressing

CL 0 0 Loop/stub in classic LSN mode

Configuration

The Short Circuit Isolator isolates alarm zones in which a short circuit has occurred. The following illustrations show typical configurations of the isolator module.

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2 | FLM‑I 420‑S Short Circuit Isolator

LSN2

LSN1

b1+

a-a-

b2+b2+b2+

III

FLM-I 420-S

LSN

b1+

b1+b1+

b1+

a-a-a-

b2+

b2+b2+

b2+

FLM-I 420-SFLM-I 420-S

LSN

Wiring example: Isolation of separate floors

The surface-mounted housing has two cable ducts on

•

opposite sides:

2 x 2 pre-punched for diameter up to 21 mm/to

34 mm (for conduits) 2 x 4 rubber bushes for inserting cables with

diameters of up to 8 mm.

In addition, there are cable ducts on the base of the

•

surface-mounted housing:

1 x pre-punched cable ducts for diameter up to

21 mm (for conduits) 2 x 4 rubber bushes for inserting cables with

diameters of up to 8 mm.

Connectable to the fire panels FPA‑5000 Modular and

•

FPA‑1200 with LSN technology improved version.

Parts Included

Qty. Components

1 Short Circuit Isolator with surface-mounted housing.

1 DIN rail adapter

Note Alternatively to the use of the surface-

mounted housing, the Isolator can be mounted on a DIN rail with the included adapter.

Pos. Description

1 Fire panel

I, II, III Floors

Typical wiring in a T‑Tap

Pos. Description

1 Alarm zone / device group with LSN elements

Certifications and Approvals

Complies with EN54-17:2005

Region Certification

Germany VdS G 207045 FLM-I 420-S; FLM-I 420-D

Installation/Configuration Notes

National standards and guidelines must be taken into

•

account during the planning stage.

Technical Specifications

Electrical

Input voltage 15 V DC to 33 V DC

Max. current consumption

During initialization

•

Following the initializa-

•

< 0.4 mA

< 0.25 mA

tion

Mechanics

LSN/Address setting 3 rotary switches for

Mode LSN classic or LSN improved

•

version

Automatic or manual addressing

•

Connections 6 threaded clamps

Housing material

Isolator module

•

Surface-mount hous-

•

PPO (Noryl)

ABS/PC-Blend

ing

Housing color

Isolator module

•

Surface-mount hous-

•

Off-white, similar to RAL 9002

Signal white, RAL 9003

ing

Dimensions Approx. 126 x 126 x 71 mm

(4.96 x 4.96 x 2.8 in.)

Weight Approx. 150 g (5.3 ounces)

+ 2 hidden pages