ACPS-610/E Manual —
P/N 53018:A1 07/31/2007
45
Section 5: Power Supply Calculations
Calculations must be done to determine standby and alarm DC current loads. Ampere-hour
requirements must be calculated as well to determine battery size.
In the following section, the term “secondary” refers to the ACPS-610’s backup batteries: the term
“primary” is reserved for the ACPS-610’s primary source of power, 120 VAC 50/60 Hz power or
220-240 VAC 50/60 Hz power. The term “standby” refers to the output current required when no
fire alarm is present. The term “alarm” refers to the output current required when a fire alarm is
present.
5.1 DC Current Draw Calculations
The ACPS-610 provides filtered 24VDC power that may be used for operating Notification
Appliance Circuits (4 x 1.5 A) or other external devices (4 x 1.5 A with charger enabled or 4 x 2.5
A with charger disabled). The power for operating external devices is limited. Use Tables 5.1
through 5.5 to determine if external loading is within the capabilities of the power supply.
1.
Enter the current draw values for each output into Tables 5.1 through 5.4. Refer to the Device
Compatibility document and the device manufacturer’s data sheets packaged with each device
to find the standby and alarm current draws to use in these tables.
2.
Enter the Standby Current Total and the Alarm Current Total from each of these four tables
into Table 5.5, and add the figures in Column A and Column B to determine total DC current
draw.
Table 5.1 DC Current Draw Calculations, ACPS-610 Output 1
NOTE:
Columns A and B of Tables 5.1 through 5.5 are not battery calculations. They are current
calculations to confirm whether the ACPS-610 can output enough DC current to support its
devices during standby and alarm conditions.
OUTPUT 1
C
ATEGORY
COLUMN A
Standby Current (amps)
COLUMN B
Alarm Current (amps)
Qty
X current draw=
Total
Qty
X current draw=
Total
Power Supervision Relays
(EOLR-1)
X =
A
X =
A
4-Wire Smoke Detectors
X =
A
X =
A
4-Wire Smoke Detectors
X =
A
X =
A
Annunciators
X =
A
X =
A
Auxiliary Devices
X =
A
X =
A
Auxiliary Devices
X =
A
X =
A
Auxiliary Devices
X =
A
X =
A
Notification Appliances
Not Applicable
X =
A
Notification Appliances
X =
A
Notification Appliances
X =
A
Sum each column for totals
Output 1
Standby Current
Draw total:
A
Output 1
Alarm Current
Draw total:
A
