Model 6820 / 6820-EVS Installation Manual
LS10144-001SK-E
4-5
outs (on either the main control panel or the RBB cabinet), that are not previously being used may be uti-
lized to connect conduit between the two cabinets.
4.
Connect battery leads to the backup battery terminals. See Figure 4-6.
Observe the proper polarity to prevent damage to the batteries or the control panel.
5.
Insert the RBB cover screws into the cover mounting holes. See Figure 4-6.
Screw the cover screw ¾ of the way into the cover mounting hole.
6.
Align the cover plate mounting keyhole over the cover mounting screws. See Figure 4-7.
Figure 4-7 Cover Plate Mounting Keyholes and Cover Mounting Screws Alignment
7.
Slide the cover into place and tighten the cover mounting screws. See Figure 4-7.
4.4
SBUS Wiring
This section contains information on calculating SBUS wire distances and the types of wiring configurations
(Class A and B).
4.4.1
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. If a large number of accessory mod-
ules are required, and the worst case current draw will exceed the 1 amp limit, then the current draw must
be distributed using 5895XL Power Expanders. Each 5895XL Power Expander provides an additional
SBUS, with an additional 1 amp of SBUS current. Wiring distance calculations are done separately for
each 5895XL, and separately for the control panel itself.
Table 4-1: SBUS Device Current Draw
Model Number
Worst Case Current Draw
6860, 5860, 6855 Fire Annunciator
.120 amps
5815XL SLC Loop Expander
.150 amps
6815 SLC Loop Expander
.078 amps
5824 Serial/Parallel Printer Interface Module
.040 amps
5880 LED I/O Module
.250 amps
5865 LED Annunciator
.200 amps
Cover Plate
Mounting Keyholes