HOCHIKI YBN-R/3(SCI)-OEM SHORT-CIRCUIT
ISOLATOR ADAPTOR INSTALLATION INSTRUCTIONS
General Description
The YBN-R/3(SCI)-OEM is an adaptor featuring an integral short-circuit isolator, which has
been designed to be fitted to a standard sensor mounting base (YBN-R/3) to convert it into a short-circuit isolator
base. This combined unit will then detect and isolate short-circuits on the loop. When a short-circuit is detected
the combined unit will drop the power to the rest of the loop.
The combined unit is compatible with the ESP range of sensors (see compatibility chart below) and does not
require a loop address. A remote fire LED facility is provided when a sensor is attached to the combined unit.
Note:- A fitted sensor will still be powered when this device is isolating.
Fitting to a YBN-R/3 Standard Base
Fit the adaptor to the underside of the YBN-R/3 standard mounting base as shown above, ensuring that the
alignment nibs on both units are aligned. The three fixing posts on the adaptor provide a snug fit to the moulded
posts on the underside of the YBN-R/3. Ensure that the flying leads on the adaptor are passed through the hole in
the base of the YBN-R/3.
Connect the two flying leads to the appropriate wiring terminals on the YBN-R/3. These are:
BLACK (Loop –ve) to terminal 6 and RED (Loop +ve) to terminal 1.
Compatibility
The combined unit as an isolator base has been designed to work with the sensors listed below. All sensors are
compatible with Hochiki ESP (Enhanced System Protocol).
Sensor Type Ordering Code
Photoelectric (smoke) sensor ALG-E, ALG-EN, ALK-E, ALN-E (and all variants)
Ionisation (smoke) sensor AIE-E (and all variants)
Temperature (heat) sensor ATG-E, ACB-E, ATJ-E (and all variants)
Multi (smoke and/or heat) sensor ACA-E, ACC-E (and all variants)
2-3-0-1591/ISS1/OCT12
Specifications
A
Ordering codes
YBN-R/3(SCI)-OEM (ivory)
YBN-R/3(WHT)-SCI-OEM (white)
Protocol ESP
Operating Voltage 19 - 41 V dc (24 V dc nominal)
Standby current 60 µA
Current drawn by isolator during fault condition < 4 mA
Maximum current consumption from remote LED 10 mA (limited by attached sensor)
Maximum continuous current 1 A
Maximum quantity per loop 127*1
Ambient temperature range
-10 C to +50 C
Relative humidity 10% to 95% RH (at 40C)
Colour and case material Ivory or White ABS
Fixing centres 48 mm through to 74 mm
Maximum wire thickness 2.5 mm²/terminal
Weight 82 g
*1 Check with Fire alarm control panel manufacturer for
maximum loop quantities
See AP0127 for short-circuit isolator specifications
Precautions
Ensure that this device is installed in accordance with local standards or regulations.
Only install in suitable environments, the following should be avoided : -
Excessive ambient temperature.
Where excessive condensation or moisture is present.
Hazardous areas.
Do not use a high voltage tester on these devices.
Ensure that the combined unit is securely fixed to the ceiling or other suitable surface.
Ensure that the terminals on the combined unit are securely fastened.
When fitting the combined unit as an isolator base, for proper wiring supervision, ensure that the cables are
routed through the base terminals and not spurred off a main wiring route.
Wiring
The wiring of the combined unit should be made as
shown right:
A: Loop (+)
B: Loop (-)
C: Cable Screen
A separate self-adhesive label is supplied and should
be stuck over the existing YBN-R/3 label to indicate the
base is now a short-circuit isolator. This replacement
label also features loop wiring indications for the loop
terminal block.
Protocol specified in TI/006
YBN-R/3(SCI)-OEM
0832-CPD-2025 12 EN54-17 Short Circuit Isolators
YBN-R/3(WHT)-SCI-OEM
Hochiki Europe (UK) Ltd
Grosvenor Road, Gillingham Business Park,
Gillingham, Kent, ME8 0SA, England Telephone:
+44(0)1634 260133 Facsimile: +44(0)1634 260132
Email: sales@hochikieurope.com
Web: www.hochikieurope.com
Hochiki Europe (UK) Ltd. reserves the right to alter the
specification of its products from time to time without notice.
lthough every effort has been made to ensure the accuracy of
the information contained within this document it is not warranted
or represented by Hochiki Europe (UK) Ltd. to be a complete and
up-to-date description. Please check our web site for the latest
version of this document.
2-3-0-1591/ISS1/OCT12
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