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Tyco MX4428 Analogue Loop Configuration Selection, Lines & Loops, Loop Fault Tolerance

Models: MX4428

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MX4428 MXP Engineering / Technical Manual

Document: LT0273

Analog Loop Design Considerations

 

4.1 ANALOGUE LOOP CONFIGURATION SELECTION

4.1.1LINES & LOOPS

The interface between the MXP and its addressable devices requires two wires.

The MXP has two lines (“left” and “right”) which are designed to be connected in a loop.

The LOOP configuration is generally preferred and indeed will often be mandatory for compliance with standards as discussed below.

However the MXP can be used to connect to multiple lines in a star configuration. Dual line mode is not supported.

4.1.2LOOP FAULT TOLERANCE

Standards require that a line/loop fault condition cause minimal disruption to the system's ability to detect and transmit alarms to the Fire Panel. The MXP achieves this in the following way .....

The MXP has access to each device from both ends of the loop. The loop is normally sourced from “left” and monitored at the “right” terminals. Disappearance of 40V power at the “right” end, due to an open circuit FAULT on either the + or – wires, can be detected (causing a FAULT event to be sent to the MX4428 Master) and corrected by switching the Line driver onto the “right” terminals. The LOOP mode is therefore inherently fault tolerant to any one open circuit on any one of the 2 wires.

However, a short circuit on the loop will, in general, cause the MXP to loose communication with all devices. Thus it is recommended that isolator bases be used to minimise the loss due to a short.

When designing fire alarm systems, the designer should be aware of any local statutory requirements, as well as those of AS1670.1 and NZS4512.

4.1.3AS1670.1 DESIGN REQUIREMENTS

Australian Standard AS1670.1 sections 3.1 and 3.2 require the analogue loop to comply with the following:

•The maximum number of actuating devices (i.e. detectors and input modules) in an alarm zone shall not exceed 40.

•A single short circuit shall not disable more than 40 devices connected to the MXP loop/line. This means than if more than 40 devices are to be connected to an MXP, short circuit isolators must be used. The count of 40 includes conventional detectors connected to a DIM800 or other ancillary input device

4.1.4NZS4512 DESIGN REQUIREMENTS

•Isolator Bases must be fitted between zones (or on the first device either side of a zone boundary) so that a single short circuit or break will affect no more than one zone.

•In many cases the tones produced by the 814SB sounder base are not acceptable. Refer to NZS4512 for detailed requirements.

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24 March 2006

Issue 1.5

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Tyco MX4428 Analogue Loop Configuration Selection, Lines & Loops, Loop Fault Tolerance, 3 AS1670.1 Design Requirements
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MX4428 specifications

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