Shield Aura - Main Back Board; NAC Outputs; Regulated NAC Outputs

Main Back Board
NACOutputs
NACOutputs Terminal
NAC 1 (+ ), (- )
NAC 2 (+ ), (- )
NAC 3 (+ ), (- )
NAC 4 (+ ), (- )
NAC 1 and 2 can be configured to provide one Class A circuit (NAC 1&NAC2)or two Class Bcircuits (NAC1
and NAC 2).
NAC 3 and 4 can be configured to provide one Class A circuit (NAC 3&NAC4)or two Class Bcircuits (NAC3
and NAC 4).
Each NACcircuit, whether Class A or Class B, has the following ratings:
AUX Power Output Range
Channels configured to power non-NACdevices are rated special application
20V - 26.4V at 2A max, power-limited. Refer to NACPower Output Modes for
compatible devices.
Quiescent Current Consumption 30 mA
Maximum Current Consumption 50 mA (exclude current draw on outputs)
Current per NACOutput 2.5 A per channel, power-limited
Fuse (Electronic)
Average Current Limit:1 to 2.5A, programmable
Peak Current Limit:3.0 A, fixed per channel
Supervision Reverse-polarity
End-of-Line Device Diode
Short Circuit Threshold 130 Ohms +/- 20%
Maximum Line Impedance 4V loss (load-dependent)
Regulated NAC Outputs
NAC outputs operate in a regulated mode when conforming to specific levels of continuous or pulsed DC. NAC
outputs meet requirements for regulated levels when the output current does not exceed the constraints
described below.
Regulated Non-Pulsing
Output Current
Currents cannot exceed 2.5A from any single NAC output:
Combined currents of all four NAC outputs cannot exceed 5A
Appendix A: Specifications
SHIELD Fire, Safety & Security Ltd
Aura Fire Alarm Control Panel Installation Manual
Version 1.00 |June 2019 |MAN-1431VS
Page 111