Overview 2
Shield Fire, Safety and Security Ltd.
Shield A-XT Releasing Fire Control Panel - Installation and Operation Manual SEXTCP-OM
Revision E01.00
9 of 127
Internal Power Supply
The internal power supply of the Shield A-XT Releasing Fire Control Panel meets UL 864, 9th edition and
provides a 2 Amp, linear power-source for operating FACP functions as well as charging the standby batteries.
The 2 Amp power supply operates 115 VAC and 230 VAC models of the Shield A-XT Releasing
Fire Control Panel.
Reference Appendix C, Calculations to determine load current limitations of the 2 Amp power supply
Features of the internal power supply include:
Power Outputs
The Shield A-XT Releasing Fire Control Panel provides power outputs the terminals of NAC 1, NAC 2, and
NAC 3, AUX 24V, STATUS UNITS and EXTING. terminals.
Reference Section 3, Installation and Appendix A, Specifications for further information concerning NAC, Releasing,
Status Unit and AUX 24V outputs of the Shield A-XT Releasing Fire Control Panel.
Releasing Circuit
The Shield A-XT Releasing Fire Control Panel provides features for operating releasing signal delay, device
supervision, releasing emergency abort, flood control and manual release.The Shield A-XT Releasing Fire
Control Panel operates releasing devices in compliance with Fire Protection Service Valves under UL 260, UL 429 and
UL 429A.
NAC Outputs
NAC outputs of the Shield A-XT Releasing Fire Control Panel are programmable and can be operated in
regulated or special application mode.
Reference Appendix A, Specifications for constraints and operating levels of these NAC output modes.
Battery-backup
Provides battery power to the load when the AC input of the power supply falls
below the rated level. The voltage at the load remains within the specified range
during these switching-transitions.
Battery-boost
Boosts voltage when the battery voltage drops due to a low-battery condition.
Short-circuit protection
Provides a shut down on the load side of the power supply when the load-current
exceeds the maximum level.
Automatic-retry
Restores output to the load when operating conditions return to nominal levels.
This feature restores voltage levels at the load following conditions such as
over-current and battery depletion.
Status
The AC input to the power supply is supervised by the A-XT Releasing Fire
Control Panel with Releasing. The control panel provides an LED status display
for normal and trouble conditions. Normal conditions occur when the power
supply is operating in an acceptable range. Trouble conditions occur when the
power supply is not operating in an acceptable range.
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