6: Ann-Bus Annunciators/Devices; Ann-Bus Wiring - Fire-Lite MS-9600LS Manual

Installation
2.6.6 ANN-BUS Annunciators/Devices
NOTE: Refer to "Canadian Applications" on page 172 for specific Canadian requirements.
WARNING: RISK OF ELECTRICAL SHOCK AND EQUIPMENT DAMAGE
!
DISCONNECT ALL SOURCES OF POWER (AC AND DC) BEFORE INSTALLING OR REMOVING
ANY MODULES OR WIRING.

ANN-BUS Wiring

This section contains information on calculating ANN-BUS wire distances and the types of wiring
configurations (Class B).
Calculating Wiring Distance for ANN-BUS Modules

The following instructions will guide the installer in determining the type of wire and the maximum
wiring distance that can be used with FACP ANN-BUS accessory modules.
To calculate the wire gauge that must be used to connect ANN-BUS modules to the FACP, it is nec-
essary 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 following table:
ANN-80 LCD Annunciator
ANN-S/PG Serial/Parallel Printer Interface Module
ANN-I/O LED Driver Module
ANN-(R)LED Annunciator Module
ANN-RLY Relay Module
After calculating the total worst case current draw, Table 2.1 specifies the maximum distance the
modules can be located from the FACP on a single wire run. The table ensures 6.0 volts of line
drop maximum. In general, the wire length is limited by resistance, but for heavier wire gauges,
capacitance is the limiting factor. These cases are marked in the chart with an asterisk (*). Maxi-
mum length can never be more than 6,000 feet (1,800 m), regardless of gauge used. The formula
used to generate this chart is shown in the note below.
Total Worst Case Current
44
Model Number
1 Total worst case current draw on a single ANN-BUS cannot exceed 0.5 amp. If
current draw exceeds 0.5 amps, refer to "Powering ANN-BUS Devices from
Auxiliary Power Supply" on page 46.
Wiring Distance: ANN-BUS Modules to FACP
22 Gauge
Draw (amps)
0.100 1,852 ft.
0.200
0.300
0.400
0.500
Table 2.1 Wiring Distances
0.040 amps
0.040 amps
0.200 amps
0.068 amps
0.075 amps
18 Gauge
4,688 ft.
926 ft. 2,344 ft.
617 ft. 1,563 ft.
463 ft. 1,172 ft.
370 ft. 938 ft.
MS-9600LS Series Manual — P/N 52646:B8 11/20/2015
Optional Modules and Devices
1
Worst Case Current Draw
16 Gauge 14 Gauge
* 6,000 ft. *6,000 ft.
3,731 ft. 5,906 ft.
2,488 ft. 3,937 ft.
1,866 ft. 2,953 ft.
1,493 ft. 2,362 ft.