Cooper Security M2000 Guide de l'utilisateur télécharger pdf (Page 19)

Engineering Manual Introduction

Networker Interface Board

A Networker Interface Board (NIB) enables the maximum distance from a control panel to an

MSNode, MRNode. MSPSU, MIDNode, IDNode or keypad to be increased to 1km.

The NIB is supplied as a driver unit and receiver unit. The driver unit connects to the output of

the control panel and the receiver unit can be connected up to 1km away. A separate remote

power supply unit is required at the receiver unit.

Calculating Voltage Drop

In order for the system to work correctly, the voltage at each device must NOT drop below

10.5V. Cooper Security recommend that for reliable working while mains power is present you

should ensure that the voltage at each device is above 12.0V.

Standard 7/0.2 alarm cable has a resistance of 8Ohms per 100m per core. The voltage drop is

calculated using the following formula:

V Drop = Current drawn x cable length x 0.08 x 2

The shaded area of the table shows where the voltage drop exceeds 1.6V. Since the voltage of

the A and B connections on the network cabling is 13.6V at the control panel, the shaded area

represents cable lengths and current drawn combinations where the voltage drops below 12V.

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Cooper Security M2000 Guide de l'utilisateur Page 19