Bosch FLM-I 420-S Manual

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

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

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

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.

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

www.boschsecurity.com

2 | FLM‑I 420‑S Short Circuit Isolator

Wiring example: Isolation of separate floors

LSN2

LSN1

b1+b1+b1+

a-a-a-

b2+b2+b2+

III

FLM-I 420-S

LSN

Pos. Description

1 Fire panel

I, II, III Floors

Typical wiring in a T‑Tap

b1+

b1+b1+

b1+

a-a-a-

b2+

b2+b2+

b2+

FLM-I 420-SFLM-I 420-S

LSN

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.

•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.

Technical Specifications

Electrical

Input voltage 15 V DC to 33 V DC

Max. current consumption

•During initialization < 0.4 mA

•Following the initializa-

tion

< 0.25 mA

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 PPO (Noryl)

•Surface-mount hous-

ing

ABS/PC-Blend

Housing color

•Isolator module Off-white, similar to RAL 9002

•Surface-mount hous-

ing

Signal white, RAL 9003

Dimensions Approx. 126 x 126 x 71 mm

(4.96 x 4.96 x 2.8 in.)

Weight Approx. 150 g (5.3 ounces)

Produkt Specifikationer

Mærke:	Bosch
Kategori:	Ikke kategoriseret
Model:	FLM-I 420-S
Bredde:	126 mm
Dybde:	126 mm
Højde:	71 mm
Vægt:	150 g
Produktfarve:	Hvid
Antal:	1
Frekvensområde:	- Hz
Indgangsspænding:	15 - 33 V
Strømforbrug:	0.4 mA