Determining The Control's Power Supply Load - Honeywell VISTA-128BPT Installation And Setup Manual

VISTA-128BPT/128BPT-SIA/250BPT INSTALLATION AND SETUP GUIDE

Determining the Control's Power Supply Load

Use the tables that follow to calculate the total current for the Auxiliary Power, the Alarm Output, and the Polling Loop.
In each table, multiply each device's standby and/or alarm current by the number of units used.
In Table 1, enter devices used on the polling loop.
Calculate total current draw on the polling loop.
Table 1: Total Polling Loop Current Draw
Polling Current
Loop
Device
Polling Loop Subtotal
(Terminals 24 & 25 – 128mA)
∗The total current cannot exceed 128mA. If total load
exceeds 128mA, then a 4297 Loop Extender Module can be
used. Note that the total number of points connected to the
panel cannot exceed 119.
In Table 2, enter devices used on Auxiliary Power.
Calculate standby and alarm currents, then add to get
Auxiliary Power current subtotal.
Table 2: Auxiliary Power Current Load
# of Total
Units
*
4-38
Device Device
Model Current X #
# of Units
Auxiliary Power Subtotal
(Terminals 6 & 7 – 750mA
max.)
Total Current
Standby Alarm