User guide

PowerLoop Calculator Tool
6. PowerLoop Calculator Tool
6.1 Introduction
The PowerLoop Calculator Tool is an integrated part of the AutroSafe
Configuration Tool. The tool allows you to define and edit a Power
Loop with a number of Loop Units.
Based on the power consumption and the cable loss, the tool
presents a go/no-go test to the user. The defined Power Loop can be
saved for possible changes at a later stage.
The tool can be used with loose relation to the actual configuration,
based on the fact that the cabling itself is analysed. The similar
mechanism is used for the Loop Calculator.
The upper part (white list box) shows the calculation assuming a
break after the last point. The lower part (white list box) shows the
calculation assuming a break before the first point.
Each segment of the PowerLoop is decribed by one line in the
calculation sheet. The total cable segment loss is determined as a
sum of cable resistance, junction loss in terminals/connectors and the
internal switches in the units. The voltage calculated at each unit is
actually the internal voltage after the PowerLoop isolation switches,
i.e. some internal loss adds to the external cable loss.
The loss of the first cable segment includes this internal loss of the
loop driver.
The calculator iterates the loop, and verifies that the total power
consumption and voltage available at each loop unit is within
specifications.
System Description, AutroSafe Integrated Fire & Gas Detection System, 116-P-ASAFE-IFG/XE Rev. B, 2005-10-27,
Autronica Fire and Security AS
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