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R
333 Bayview Avenue
Amityville, New York 11701
For Sales and Repairs, (800) 645-9445
For Technical Service, (800) 645-9440
© NAPCO 2005
DESCRIPTION
A charger and a supervised power-limited supply, the
NP-P3ASUP converts low voltage AC input into a
12VDC or 24VDC power limited output, with 3A of con-
tinuous supply current.
FEATURES
• Maximum charge current .5 amps.
• 12VDC or 24VDC selectable output.
• 3 amps continuous supply current at 12VDC-24VDC.
• Filtered and electronically regulated outputs.
• Built-in charger for sealed lead acid or gel type batter-
ies.
• Automatic switch over to stand-by battery when AC
fails (zero voltage drop).
• AC input and DC output LED indicators.
• AC fail supervision (form "C" contacts).
• Low battery supervision (form "C" contacts).
• Short circuit and thermal overload protection.
• Includes battery leads.
Board Dimensions: 179.3mm(L) x 108.7mm(W) x45mm(H)
Specified at 25° C ambient.
VOLTAGE OUTPUT/TRANSFORMER SELECTION TABLE
Output
Switch
Max.
VDC
Position
Load DC
12VDC
SW1-1
3 amps
OFF
24VDC
SW1-1
3 amps
ON
INSTALLATION INSTRUCTIONS
The NP-P3ASUP should be installed in accordance with
The National Electrical Code and all applicable Local
Regulations.
1. Mount the NP-P3ASUP in desired location.
2. Set the NP-P3ASUP to desired DC output voltage
via SW1 (see Voltage Output/Transformer Selection
Table).
3. Connect proper transformer to terminals marked
POWER SUPPLY/ CHARGER
Transformer Requirements
24VAC / 100VA
28VAC / 175VA-
NP-P3ASUP
3 AMP SUPERVISED
[AC] (see Voltage Output/Transformer Selection Ta-
ble).
Use 18 AWG or larger for all power connections
(Battery, DC output).
Use 22 AWG to 18 AWG for power limited circuits
(AC Fail/Low Battery reporting).
4. Connect devices to be powered to terminals marked
[+ DC -].
Note: It is important to measure output voltage be-
fore connecting devices. This helps avoid potential
damage.
5. When the use of stand-by batteries are desired, they
must be lead acid or gel type.
Connect battery to terminals marked [+ BAT -] on the
board (battery leads included).
Use two (2) 12VDC batteries connected in series for
24VDC operation.
Note: When batteries are not used a loss of AC will
result in the loss of output voltage.
6. Connect appropriate signaling notification devices to
AC Fail & Low battery supervisory relay outputs
marked [N.C., C, N.O.].
Red
Green
(DC)
(AC)
ON
ON
Normal operating condition.
ON
OFF
Loss of AC, Stand-by battery supplying power.
OFF
ON
No DC output. Short circuit or thermal overload condition.
OFF
OFF
No DC output. Loss of AC. Discharged or no battery.
TERMINAL IDENTIFICATION
Terminal
Legend
AC/AC
Low voltage AC input (see voltage output/transformer selection table).
For 12VDC output use 24VAC or higher with 100 VA power rating or
higher.
For 24VDC output use 28VAC with 175VA power rating or higher.
Caution: Do not apply voltages above 28VAC (28 VAC is maximum
input rating)
+ DC -
12VDC/24VDC @ 3 amps continuous power limited output.
AC FAIL
Used to notify loss of AC power, e.g. connect to audible device or alarm
N.C., C, N.O.
NC, C, NO panel. Relay normally energized when AC power is present.
Contact rating 1 amp @ 120VAC / 28VDC
Low Battery
Used to indicate low battery condition, e.g. connect to alarm panel.
N.C., C, N.O.
NC, NO, C Relay normally energized when DC power is present.
Contact rating 1 amp @ 120VAC / 28VDC.
Low battery threshold:
12VDC output threshold set @ approximately 10.5VDC,
24VDC output threshold set @ approximately 21VDC.
+ BAT -
Stand-by battery connections. Maximum charge rate .5 amp.
WI1339A 12/05
LED DIAGNOSTICS
Power Supply Status
Function/Description
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