MX4428 Smoke Alarm Isolator Base

MX4428 MXP Engineering / Technical Manual		Document: LT0273
Device Information and Programming

3.12	5BI ISOLATOR BASE

3.12.1GENERAL

The 5BI base is designed for isolating short circuited sections of the analog loop. For instance it can be used where the loop wiring crosses zone boundaries to prevent a short circuit from affecting more than one zone. When isolator bases are used, it is strongly recommended that two additional isolator bases (possibly with no detectors inserted) be installed at the start and end of the loop, close to the MXP.

Isolator bases may also be used to join multiple lines together in a single star arrangement, for example when a number of conventionally wired zones are being converted to MX and a loop cannot be wired.

Refer to section 4.1 for more details on the analog loop configuration.

There is a limit to the number of other devices which may be connected on the section of cable between isolator bases. Calculate the sum of the “IB Units” from Table 3-2for each section of cable. The sum for each section must not exceed 100.

A section of cable is the portion between isolator bases or between an isolator base and the MXP, or if a star configuration or tee is being used, between an isolator base and the end of the cable.

3.12.2SPECIFICATIONS

Line Connections IN	M(–), L1(+)
Line Connections OUT	L2(–), L1(+)
Remote LED Connection	R(–), L1(+)
Supply Voltage	20Vdc - 40Vdc
Supply Current	80uA (typical quiescent)
Dimensions	110mm (diameter) x 22mm (excluding detector)
Weight	80g

3.12.3WIRING

Figure 3.2 shows wiring for an 5BI, including connection of an external remote indicator.

Note that a common remote indicator may not be wired to a set of bases which are on different sides of an isolator base.

Page 3-26

24 March 2006

Issue 1.5

MX4428 specifications

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Tyco Comprehensive Guide to Isolator Base for Smoke Alarms

Models: MX4428

5BI ISOLATOR BASE