AFP-3030 Installation Manual — P/N DOC-01-037:B 25/08/2016 34
Power Supply Calculations Electrical Specifications
Relay Output circuits are “Common” 30 V DC, 2 A (see Section 3.6 “Form-C Relays on the
CPU”).
A.6 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.
The NPS power supply provides filtered 24 V DC (nominal) power that may be used for operating
external devices. The power for operating external devices is limited. Use Table A.2 to determine if
external loading is within the capabilities of the power supply.
A.6.1 Calculating the System Current Draws
The NPS must be able to power all devices in the panel in the quiescent condition as well as charge
the batteries. The NPS does not need to provide enough current to run the panel when in the alarm
condition, if the panel needs more current than the NPS can supply during alarm, the extra current
Circuit Type Circuit Function Wire Requirements
Distance
(feet/meters)
Typical Wire Type
SLC
(power limited)
Connects to
intelligent and
addressable
modules.
Twisted-unshielded pair, 12 to 18 AWG
(3.25 to 0.75mm
2
). 50 ohms, maximum
per length of Closed (Style 6 & 7) loops.
50 ohms per branch maximum for Open
(Style 4) loops.
3,810 m
2,896 m
1,829 m
1,128 m
12 AWG (3.31 mm
2
)
14 AWG (2.08 mm
2
)
16 AWG (1.31 mm
2
)
18 AWG (0.82 mm
2
)
or Twisted-shielded pair.
NOTE:
• Shields must be isolated from ground.
• Shields should be broken at each
device.
1524 m
1,128 m
12 to 16 AWG (3.31
mm
2
to 1.31 mm
2
)
18 AWG (0.82 mm
2
)
or Untwisted, unshielded wire, in conduit or
outside of conduit.
NOTE: Maximum total capacitance for all
SLC wiring (both between conductors and
from any conductor to ground) should not
exceed 0.5 microfarads
1524 m
1,128 m
12 to 16 AWG (3.31
mm
2
to 1.31 mm
2
)
18 AWG (0.82 mm
2
)
EIA-485 ACS
Connection
(power limited)
Connects to ACS
devices such as
annunciators and
UDACT/UDACT-2
Twisted-shielded pair with a characteristic
impedance of 120 ohms. 18 AWG
(0.75mm
2
) minimum.
1829 m (max) 16 AWG (1.31mm
2
)
EIA-485 RDP
Connection
(power limited)
Connects to RDP
devices
Twisted-shielded pair with a characteristic
impedance of 120 ohms. 18 AWG
(0.75mm
2
) minimum.
1219 m (max) 16 AWG (1.31 mm
2
)
EIA-232
(power limited)
Connects to Printers
or PC.
Twisted-shielded pair. 18 AWG (0.75mm
2
)
minimum.
15.24 m
without modem
16 AWG (1.31
mm
2
)
IDC
Initiating Device
Circuit
FMM-1, FMM-101
(power limited)
12-18 AWG
Maximum circuit resistance is 20 ohms.
12 to 18 AWG
(3.31 to 0.82 mm
2
)
NAC
Notification
Appliance
Circuit
FCM-1 (power
limited)
12-18 AWG. MPS-24A: At alarm current
level, no more than a 1.2 V drop at the
end of the circuit, or sized to provide the
minimum rated operating voltage of the
appliances used.
To meet 1.2 V drop, or
sized to provide the
minimum rated operating
voltage of the appliances
used.
12 to 18 AWG
(3.31 to 0.82 mm
2
)
Releasing
Module
FCM-1-REL
12-18 AWG. 5 ohms maximum per circuit
for class A or B, or sized to provide the
minimum rated operating voltage of the
appliances used.
To meet 5 ohms maximum
circuit resistance, or sized
to provide the minimum
rated operating voltage of
the appliances used.
12 to 18 AWG
(3.31 to 0.82 mm
2
)
24 VDC Power
Runs (power-
limited)
To TM-4 Transmitter,
Annunciator and
FCM-1 modules
12-18 AWG. Size wire so that no more
than 1.2 V drop across wire run from
supply source to end of any branch.
To meet 1.2 volt drop 12 to 18 AWG
(3.31 to 0.82 mm
2
)
Table A.1 Wire Requirements
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