Installation 3
Shield Fire, Safety and Security Ltd.
Shield A-XT Releasing Fire Control Panel - Installation and Operation Manual SEXTCP-OM
Revision E01.00
26 of 127
Field Cabling
Field cabling of the Shield A-XT Releasing Fire Control Panel includes terminal connections for detection
zones, supervised inputs, Notification Appliance Circuits (NACs), releasing device circuits, relay outputs, AUX 24V
power and Status Units. Connect all field wiring to the single row of terminals along the top of the fire control panel.
Terminals accept wiring from 14 to 18 AWG. Wiring outside of the fire control panel must not be routed across the
front surface of the fire control panel.
Detection Zones
This section describes connections for detection zones of the Shield A-XT Releasing Fire Control Panel.
Detection zones are Initiating Device Circuits (IDC). Initiating Device Circuits of the Shield A-XT Releasing
Fire Control Panel are power limited and include:
Detection zones of the Shield A-XT Releasing Fire Control Panel provide a nominal 24 VDC for powering
conventional detectors and pull stations. Detectors must be wired in a daisy-chain without T-Top connections.
Detection zones are supervised for open-circuit, short-circuit and ground-fault conditions with the installation of the
6.8K Ohm EOL resistor, SEOLR-6.8. Place the 6.8K Ohm EOL resistor across the last device in the detection zone
circuit to provide this supervision.
Zones of the Shield A-XT Releasing Fire Control Panel operate NFPA 72 Class B, Style C or NFPA 72, Class B,
Style B. Style C devices provide trouble conditions for direct shorts and opens on zone loops. Style B devices provide
alarm conditions for direct shorts and trouble conditions for opens on zone loops.
Change the default operation of Style C to Style B by using the appropriate configuration code. Set the following
configuration code on the fire control panel to provide a Class B alarm when a short circuit condition occurs
in Zone 1, 2 or 3:
• Set C71 to alarm when a short circuit condition occurs in Zone 1.
• Set C72 to alarm when a short circuit condition occurs in Zone 2.
• Set C73 to alarm when a short circuit condition occurs in Zone 3.
The maximum number of detectors per zone is device and manufacturer dependent.
Detection Zones Include connections for ZONE 1, ZONE 2 and ZONE 3
Supervised Inputs Include connections for MAN RELEASE, ABORT, REL. PRES. SWITCH and the LOW
P. SWITCH
Remote Control Inputs Remote Control connections ROV, SIL, AL, FLT, RST are unused on the Shield
A-XT Releasing Fire Control Panel and are designated as No Connect (NC) terminals.
Mode Select Mode Select connections are unused on the Shield A-XT Releasing
Fire Control Panel and are designated as No Connect (NC) terminals.
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