Bosch Appliances Radio 420 User Manual

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  
 
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  
 
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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