General System Overview
FCPS-24S PN 51977:C1 08/06/03 7
SECTION 1 System Overview
The FCPS-24S6 is a 6 amp power supply and the FCPS-24S8 is an 8 amp power supply. Each
FCPS-24S power supply is a compact, cost-effective, remote power supply and battery charger
which provides ADA compatible strobe synchronization. The remote power supplies consist of a
filtered 24 VDC output that can be configured to drive four Style Y (Class B) NACs (Notification
Appliance Circuits). The four circuits can be configured for Style Z (Class A) with the optional
ZNAC-4 Class A converter module. Alternatively, the four output circuits may be configured as 24
VDC resettable or nonresettable power outputs. The input circuits, which control the power supply
operation, are triggered by the reverse polarity of an NAC or by a 12 VDC or 24 VDC power
source. The power supplies are compatible with 12 VDC and 24 VDC control panels.
1.1 General
The FCPS-24S power supplies can be used as remotely mounted power supplies and battery
chargers to power four noncoded or coded NACs. The Main FACP (Fire Alarm Control Panel)
NAC(s) is connected to the remote power supply input circuit(s). When the control input circuit
activates due to reverse polarity of the NAC from the FACP, the power supply will activate its
Notification Appliance Circuits.
During the inactive or nonalarm state, the power supply supervises its NAC field wiring for short
and open conditions. AC fail, battery, charger and ground fault troubles will also be monitored by
the power supply. If an NAC or power supply fault is detected, the power supply Normally-Closed
Trouble contact will open.
If an alarm condition occurs and the NAC is activated, the supervision is disabled and the
Notification Appliance Circuit is no longer supervised. Supervision of other power supply faults
such as low battery, AC loss, ground fault and battery charger trouble will continue and may be
monitored via the Trouble relay contacts.
1.2 Features
• Self-contained in a lockable cabinet
• 24 VDC remote power supply
• Outputs are completely power-limited
• Two optically-isolated input/control circuits, compatible with 12 VDC and 24 VDC control
panel NACs
• Four output circuits:
✓ Fully filtered power
✓ Four 24 VDC Style Y (Class B) NACs
✓ Optional ZNAC-4 Class A converter module for conversion to Style Z NACs
✓ Alternatively, all four circuits may be configured as 24 VDC power outputs
✓ Output circuits may be configured as resettable or nonresettable
• NAC Trouble LED - blinks to indicate the number of the circuit in trouble
• Maximum current available for any one output circuit: 3.0 amps
• Maximum total continuous current available:
✓ 4.0 amps for FCPS-24S6
✓ 6.0 amps for FCPS-24S8
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