Hochiki YBN-R-3-SCI User Manual

HOCHIKI YBN-R/3(SCI) SHORT-CIRCUIT ISOLATOR
BASE INSTALLATION INSTRUCTIONS

General Description

The YBN-R/3(SCI) is a sensor mounting base featuring an integral short-circuit isolator which
will detect and isolate short-circuits on the loop. When a short-circuit is detected during power up the unit will drop
the power to the rest of the loop.

The YBN-R/3(SCI) is compatible with the ESP range of sensors (see compatibility chart below). The unit does not
require a loop address. A remote fire LED facility is provided when a sensor is attached to the base.

Note:- A fitted sensor will still be powered when this device is isolating.

Specifications

Ordering code YBN-R/3(SCI)
Protocol ESP
Operating Voltage 17 - 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
Relative humidity
Colour and case material Ivory or White ABS
Fixing centres 48 mm through to 74 mm
Maximum wire thickness 2.5 mm²/terminal
Weight 79 g

*1 Check with Fire alarm control panel manufacturer for
maximum loop quantities

-10 C to +50 C
10% to 95% RH (at 40C)

See AP0127 for short-circuit isolator specifications

Compatibility

The YBN-R/3(SCI) 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)

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 YBN-R/3(SCI) base isolator is securely fixed to the ceiling or other suitable surface.
 Ensure that the terminals on the unit are securely fastened.
 When fitting the YBN-R/3(SCI) isolator base, for proper wiring supervision, ensure that the cables are routed

through the base terminals and not spurred off a main wiring route.

2-3-0-1499/ISS2/JAN13

Wiring

A

The wiring of the YBN-R/3(SCI) short circuit isolator
base should be made as shown right:

A: Loop (+)
B: Loop (-)
C: Cable Screen

Protocol specified in TI/006

YBN-R/3(SCI)

YBN-R/3(WHT)-SCI

YBN-R/3(HFP)-SCI
Hochiki Europe (UK) Ltd

Grosvenor Road, Gillingham Business Park,
Gillingham, Kent, ME8 0SA, England Telephone:
[phone] Facsimile: [phone]
Email: [e-mail]
Web: www.hochikieurope.com

0832-CPD-2025 12 EN54-17 Short Circuit Isolators

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.

2-3-0-1499/ISS2/JAN13