Fire Alarm Systems | FLM‑I 420‑S Short Circuit Isolator
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.
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
•
System Overview
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
5
0
5
CL
1
2
9
6
1
4
9
8
7
1
4
8
7
2
3
2
3
6
0 0 1 - 254 Loop/stub/T-tap system in LSN mode improved version
with manual addressing
LSN
a-
b1+
b2+
N/A N/A N/A
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.
Description
Connector
b1+ / a- / b2+ LSN
N/A (3 x)
free terminals, e.g. for looping through ext. auxiliary volt-
age and for shielding
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FLM‑I 420‑S Short Circuit Isolator | 3
Environmental conditions
Permitted operating tempera- -20 °C to 50 °C
ture
(-4 °F to 122 °F)
Permitted storage tempera- -25 °C to 85 °C
ture
(-13 °F to. 176 °F)
Permitted relative humidity
< 96%
Classes of equipment as per Class III equipment
IEC 60950
Protection class as per
IEC 60529
IP 54
Ordering Information
FLM‑I 420‑S Short Circuit Isolator
for the isolation of alarm zones in which a
short circuit has occurred.
FLM-I 420-S
Accessories
FLM‑IFB126‑S Surface-mounted Housing
as retainer for the interface modules ser-
ies 420 type DIN rail (-D) or spare housing for
type surface-mount (-S)
FLM-IFB126-S
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4 | FLM‑I 420‑S Short Circuit Isolator
Americas:
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
Asia-Pacific:
Robert Bosch (SEA) Pte Ltd, Security Systems
11 Bishan Street 21
Singapore 573943
Phone: +65 6258 5511
Represented by
Bosch Security Systems, Inc.
130 Perinton Parkway
Fairport, New York, 14450, USA
Phone: +1 800 289 0096
Fax: +1 585 223 9180
Fax: +65 6571 2698
© Bosch Security Systems Inc. 2010 | Data subject to change without notice
T1868129547 | Cur: en-US, V7, 16 Dec 2010
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