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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
0
5
8 2
0
5
6 4
9 1
7 3
CL 1
2
0
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
1
LSN2
LSN1
a-
a-
b+
b+
b1+
b1+
b1+
a-
a-a-
b2+b2+b2+
III
FLM-I 420-S
FLM-I 420-S
FLM-I 420-S
II
I
LSN
LSN
b1+
b1+b1+
b1+
a-
a-a-a-
b2+
b2+b2+
b2+
FLM-I 420-SFLM-I 420-S
1
LSN
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)
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Environmental conditions
FLM‑I 420‑S Short Circuit Isolator | 3
Permitted operating temperature
Permitted storage temperature
Permitted relative humidity < 96%
Classes of equipment as per
IEC 60950
Protection class as per
IEC 60529
-20 °C to 50 °C
(-4 °F to 122 °F)
-25 °C to 85 °C
(-13 °F to. 176 °F)
Class III equipment
IP 54
Ordering Information
FLM‑I 420‑S Short Circuit Isolator
for the isolation of alarm zones in which a
short circuit has occurred.
Accessories
FLM‑IFB126‑S Surface-mounted Housing
as retainer for the interface modules series 420 type DIN rail (-D) or spare housing for
type surface-mount (-S)
FLM-I 420-S
FLM-IFB126-S
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4 | FLM‑I 420‑S Short Circuit Isolator
Americas:
Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: +1 800 289 0096
Fax: +1 585 223 9180
security.sales@us.bosch.com
www.boschsecurity.us
© Bosch Security Systems Inc. 2010 | Data subject to change without notice
T1868129547 | Cur: en-US, V7, 16 Dec 2010
Europe, Middle East, Africa:
Bosch Security Systems B.V.
P.O. Box 80002
5600 JB Eindhoven, The Netherlands
Phone: + 31 40 2577 284
Fax: +31 40 2577 330
emea.securitysystems@bosch.com
www.boschsecurity.com
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd, Security Systems
11 Bishan Street 21
Singapore 573943
Phone: +65 6258 5511
Fax: +65 6571 2698
apr.securitysystems@bosch.com
www.boschsecurity.com
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