Sbus Wiring; 1: Calculating Wiring Distance For Sbus Modules - Honeywell Farenhyt Series Installation And Operation Manual

3. Run extended battery cable from control panel cabinet through conduit to RBB cabinet. See Figure 4.6.
NOTE: Figure 4.6 is an example of how the wire connections can be routed. However, any other cabinet knock-outs (on either the main control
panel or the RBB cabinet), that are not previously being used may be utilized 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 3/4 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 Class B).
4.4.1 Calculating Wiring distance for SBUS modules
The IFP-300/ECS panel has two SBUS circuits which can support up to 1.0A of module load per SBUS circuit. When determining the
type of wire and the maximum wiring distance that can be used, you will need to calculate loads for each SBUS to ensure that each
SBUS does not exceed 1.0A.
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 modules are required, and the
worst case current draw will exceed the 1 amp limit, then the current draw must be distributed using RPS-1000 Power Expanders. Each RPS-
1000 Power Expander provides an additional SBUS, with an additional 1 amp of SBUS current. Wiring distance calculations are done separately
for each RPS-1000, and separately for the control panel itself.
IFP-300 / IFP-300ECS Manual P/N LS10145-001SK-E:B 12/18/2017
Conduit
Coupler
Conduit
+
Figure 4.6 Battery Connections in the RBB Cabinet
RBB Cabinet
Cover Screws
-
+
RBB Cabinet
Cover Screws
Cover Plate
Mounting Keyholes
-
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