# User guide

Distributed Audio Panel Manual — P/N 52265:B1 6/8/2010 73
Calculating the System Current Draw Power Supply Calculations
6.3.2 How to use Table 6.2 to calculate system current draws
1. Enter the quantity of devices in both columns.
2. Enter the DC current draw where required. Refer to the Device Compatibility Document for
compatible devices and their current draw.
3. Calculate the current draws for each in both columns.
4. Sum the total current for each column.
5. Copy the totals from Column 1 and Column 2 to Table 6.3 on page 74.
Following are the types of current that can be entered into Table 6.2:
Calculation Column 1 - The standby current load that the audio panel must support (from
the batteries) during a non-fire alarm condition and a loss of AC power.
Calculation Column 2 - The alarm current draw that the audio panel must support (from
the batteries) during a fire alarm condition and a loss of AC power
Table 6.2 contains two columns for calculating current draws. For each column, calculate the cur-
rent and enter the total (in amps) in the bottom row. When finished, copy the totals from Calcula-
tion Column 1 and Calculation Column 2 to Table 6.3 on page 74.
Device Type
Calculation Column 1
Secondary, Non-Fire Alarm Current
(amps)
Calculation Column 2
Secondary, Fire Alarm Current
(amps)
Qty X [current draw] = total Qty X [current draw] = total
ACC-25/50DA consisting of:
Main Circuit Board and one ACC-AAM25
Audio Amplifier
1
X [0.285]
=[ ] 1
X [2.385]
=[ ]
ACC-25/50DA consisting of
Main Circuit Board, one ACC-AAM25 Audio
Amplifier, one ACC-ZPM Zone Page
Module and one ACC-ZSM Zone Splitter
Module
or
X [0.440]
or
X [2.505]
ACC-AAM25
Audio Amplifier Module
1
[ ]
(1 max.)
X [0.065]= [ ] [ ] X [2.00]= [ ]
FC-RM Remote Microphone Module with
2
FC-MIM Microphone Interface Module
[ ]
(1 max.)
X [0.006]= [ ] [ ] X [0.030]= [ ]
ACC-ZPM Zone Page Module [ ] X[0.059]= [ ] [ ] X[0.059]= [ ]
ACC-ZSM Zone Splitter Module [ ] X[0.005]= [ ] [ ] X[0.063]= [ ]
Power Supervision Relays [ ] X [ ]= [ ] [ ] X [ ]= [ ]
Additional Current Draw from TB9 Special
Application Auxiliary Power Output
(0.035 amps maximum)
[ ] X [ ]= [ ] [ ] X [ ]= [ ]
Sum each column for totals Secondary non-alarm: Secondary alarm:
Table 6.2 System Current Draw Calculations
1 In backup configurations, the optional ACC-AAM25 draws no current in alarm.
2 Refer to the Device Compatibility Document for compatible devices and their current draws.
3 The FC-XRM70 Transformer Module draws no current in standby or alarm.
4 The FC-LPS Local Playback Speaker Module draws no current in standby or alarm.
5 The ACC-25/50DA will turn off the background music in the event AC power is lost in order to conserve
battery power.