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Series 5000 Entry System Installation/Operation Manual

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3.5.6 SBUS Wiring

This section contains information on calculating SBUS wire distances and the types of wiring

configurations.

3.5.6.1 Calculating Wiring distance for SBUS modules

The following instructions will guide you in determining the type of wire and the maximum

wiring distance that can be used with control panel SBUS accessory modules.

To calculate the wire gauge that must be used to connect SBUS modules to the control panel,

it is necessary to calculate the total worst case current draw for all modules on a single

4-conductor bus. The total worst case current draw is calculated by adding the individual

worst case currents for each module. The individual worst case values are shown in the table

below.

Note: Total worst case current draw on a single SBUS cannot exceed 1 amp.

After calculating the total worst case current draw, Table 3-2 specifies the maximum distance

the modules can be located from the panel on a single wire run. The table insures 2.0 volts of

line drop maximum. In general, the wire length is limited by resistance, but for heavier wire

gauges, capacitance is the limiting factor.

Model Number Worst Case Current Draw

5083 .200 amps

5084 .200 amps

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 57 58

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